Thoughts On Crossdrilled/slotted Rotors Vs Plain
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From: Boston
Vehicle: 2006 Pontiac GTO
Heat is probably more of an issue when you brake a lot, like on the track. On the street you probably wouldn't see the benefit of a larger heatsink (i.e. no cross-drillings).
One thing - DTN, you mentioned a problem with a stock rear rotor - as far as I know, the rear brakes get a LOT less usage than the front ones, disc brakes are actually overkill for rears (drum brakes are enough too), so I'd guess your problem was due to something else (dragging, bad rotor?) - and not that the rotor wasn't cross drilled.
One thing - DTN, you mentioned a problem with a stock rear rotor - as far as I know, the rear brakes get a LOT less usage than the front ones, disc brakes are actually overkill for rears (drum brakes are enough too), so I'd guess your problem was due to something else (dragging, bad rotor?) - and not that the rotor wasn't cross drilled.
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From: Leesville, Louisiana
Vehicle: 2001 Hyundai Tiburon
QUOTE (KeWLKaT @ Jan 17 2008, 10:59 PM)
Also, sorry, but whatever you are talking about air we breath getting under the pad, that's hilarious. I don't know how you came up with that.
Not hillarious at all. Think about it like this,
If it's a flat surface with NO give at all, then the whole pad would be riding on 1 piece of brake dust.
if the surface has SOME give, then you would have a pocket around the brake dust.
The speck of brake dust does not allow the entire surface to make contact with the rotor. It resists slightly. the area around the speck of brake dust is gas, heated and expanded to extreme temperatures, and looking for a way out.
Brake dust buildup eats pads and burns rotors. The gas trapped in with the brake dust adds pressure to the heat generated and causes even more problems.
It's really quite simple if you think of a piece of brake dust moving around under the pad against a flat surface, polishing it, causing a gap, eating away at the rotor and pad.
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From: Quebec, Canada
Vehicle: Elantra XD GT
That's true for slots but not for drilled holes.
Also there are no gases.
And as far as ''no give'' goes... Have you ever looked at a brake pedal? There's a LOT of give. It's not metal to metal. The amount of pressure your pads apply to your rotors is INSANE. That's enough to take the spec of dust and embed it into the pad until it eventually rubs off...
Also there are no gases.
And as far as ''no give'' goes... Have you ever looked at a brake pedal? There's a LOT of give. It's not metal to metal. The amount of pressure your pads apply to your rotors is INSANE. That's enough to take the spec of dust and embed it into the pad until it eventually rubs off...
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From: Leesville, Louisiana
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^^ I was using the no give as an example. Obviously our brakes are not rolling around on brake dust.
The drills are for increased surface heat dissipation area and extra airflow, but the dust also makes it's way into the holes.
all that mashed up brake dust riding between the pad and the rotor causes extra space, gaps and gas.
The drills are for increased surface heat dissipation area and extra airflow, but the dust also makes it's way into the holes.
all that mashed up brake dust riding between the pad and the rotor causes extra space, gaps and gas.
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From: Boston
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haha.gif How does cutting holes into a thin piece of metal increase the surface area?? The diameter of the holes is obviously a hell of a lot bigger than the thickness of the rotor
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From: Los Lunas, New Mexico, USA.
Vehicle: 2001 Hyundai Tiburon, 2004 Kia Sorento, 2010 Kia Soul
Drilled and slotted rotors DO promote cooling more than a regular rotor, as you have MORE surface area to dissapate heat from, and through. You DO lose friction though, because of the loss of surface area to grip. Most BBK's include better CALIPERS though too, which increases your clamping force and overcomes the paltry surface area you may lose.
Also, Dimpled rotors are more stress crack stable than the drilled ones.
Good points on all parts here.
Also, Dimpled rotors are more stress crack stable than the drilled ones.
Good points on all parts here.
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From: Leesville, Louisiana
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QUOTE (radu_rd2 @ Jan 18 2008, 01:10 AM)
haha.gif How does cutting holes into a thin piece of metal increase the surface area?? The diameter of the holes is obviously a hell of a lot bigger than the thickness of the rotor
Because instead of sliding on brake dust and the air that naturally forms inside the divots on the pad, you remove all of that brake dust and have a new brake feel all the time. Instead of churning up tons of dust when you go 70-0 quickly, it throws that dust off. If you go with standard non-DS brakes 70-0 quickly, your braking performance is changed slightly because the surface has worn, brake dust has been collected, and a high temp glaze has formed on the rotor.
Glaze is actually an oxide layer which is caused from high temperatures. Oxide layers are used as a lubricant in standard brakes and clutches. You know the break-in period on new brakes? That's so an oxide layer can form correctly.
With D/S, the idea is you get the new brake feel most of the time. They disapate heat much better then standard rotors. It IS possible to glaze a D/S brake, but in 70degree weather, after hard braking at fast speeds, about 1 minute of cooldown is all that is needed before you can touch the D/S brakes. When I tried that with non-DS brakes, it burned my hand.
I have an IR thermometer, I drive the same route almost every time I leave Fort Jackson. I get off the highway, drive about 1 minute at 35mph and then park the car. I took temperature readings of my rotors, they were 500 degrees as soon as I stepped out of the car with standard non-DS rotors. With DS rotors, that temperature was 200.
To answer your question, it does not make more surface area. It promotes better braking.
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From: Quebec, Canada
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Sorry but I have to raise the BS flag here. 300 degrees of difference. Please.
Do you even know how fast metal cools down? You can't compare temperatures by measuring them after coming out of your car, etc... That's really not how data should be taken. Also single solitary data like that one means NOTHING. You could have used brakes differently, waited 3 seconds extra before temperature reading, etc. Plus I have the feeling you came up with this since you never mentionned it during the whole conversation, ha.
For the cooling: since there is less surface of contact it is prone to heating up more. Then it will need to be cooled more. Plain rotors won't need the same cooling. THEN AGAIN NO ONE PROVIDED ANY FACTUAL DATA ABOUT THIS.
So, please answer....
1-- WHY WOULD THEY USE PLAIN ROTORS in formula 1 if they aren't better than DS rotors?
2-- Dedicated race cars sometimes come with slots. But none use drilled holes. Some racing divisions even prohibit the use of crossdrilled rotors.
Do you even know how fast metal cools down? You can't compare temperatures by measuring them after coming out of your car, etc... That's really not how data should be taken. Also single solitary data like that one means NOTHING. You could have used brakes differently, waited 3 seconds extra before temperature reading, etc. Plus I have the feeling you came up with this since you never mentionned it during the whole conversation, ha.
For the cooling: since there is less surface of contact it is prone to heating up more. Then it will need to be cooled more. Plain rotors won't need the same cooling. THEN AGAIN NO ONE PROVIDED ANY FACTUAL DATA ABOUT THIS.
So, please answer....
1-- WHY WOULD THEY USE PLAIN ROTORS in formula 1 if they aren't better than DS rotors?
2-- Dedicated race cars sometimes come with slots. But none use drilled holes. Some racing divisions even prohibit the use of crossdrilled rotors.
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^^ That's a couple of good questions,
#1 & #2 Why do they make all of the rules they make? They all have to go by certain rules in competitions. Look at some of these crazy regulations
ANY MODIFICATION NOT COVERED IN THESE RULES WILL NOT BE ALLOWED UNLESS APPROVED BY THE MAGIC VALLEY SPEEDWAY CHIEF STEWARD IN WRITING.
Division 1 = Late Model, Division 2 = Modified. MVS= Magic Valley Speedway
8.01 General Safety
8.01.1 For all safety devices it is the responsibility of the driver, not Magic Valley Speedway, or its
officers, or its agents to ensure his/her safety device systems are correctly installed, maintained
and properly used at all times. As with all safety items Magic Valley Speedway strongly recommends that the driver carefully study all manufacturers’ installation and usage guidelines and adhere to these recommendations to the highest extent possible.
8.01.2 Steel doorplate, 18 gauge or .049-inch minimum thickness must be securely welded to the door bars on driver’s side. Plate must cover the area from the top door bar to the bottom door bar and from the rear down post to five inches in front of the seat, must be visible for inspection.
8.02 Floorboards:
8.02.1 Floorboard must extend from the front firewall to the main (roll cage bar) behind the driver. Floorboard height must not exceed 12” measured from bottom of chassis. All holes in floor must be sealed. Floorboard and transmission tunnel must be a minimum of 11-gauge steel and must be welded to the chassis. Required for Division I recommended for Division II.
8.02.2 Floorboards and transmission tunnels must be welded in place and show good workmanship and subject to approval of Magic Valley Speedway tech officials. Required for Division I recommended for Division II
8.03 Interiors:
8.03.1 Interior must be completely open, no enclosing passenger side. MVS ride along car exempt. Interior panels must be trimmed neatly around roll cage and sealed for fire protection.
8.03.2 Roll bar padding must be installed anywhere the driver may come in contact.
8.03.3 Interior panels except crush panels must be fabricated of 24-gauge steel minimum and recommended that all interior panels be welded in place. Required for Division I recommended for Division II. Interior holes must be sealed.
8.03.4 Interior panels at right of driver from door bars in must direct down toward floor tunnel.
8.04 Overall Car Weight:
8.04.1 Minimum car weight including driver is 2,950 at Pre race inspection. Division II cars must weigh a minimum of 2,550 pounds at Pre race inspection. Maximum Left side weight is 58% for mods and 56% for late models including driver with both hands on steering wheel with belts and helmet on. Cars may be weighed after main events. THIS RULE, AS ALL OTHERS, MAY BE RECINDED OR CHANGED AS DEEMED NECESSARY TO IMPROVE COMPETITION AT ANY TIME.All cars will be weighed on Magic Valley Speedway’s scales. These scales will be the only method for determining a car’s weight.
8.05 Added Car Weight:
8.05.1 Added weight must be in block form of no less than 5 pounds. No lead shot or liquid ballast will be permitted. All added weight must be in a tube or securely bolted in place with a minimum of 2 (½-inch) diameter, grade 5 bolts with locking nuts. No aluminum brackets. All added weight MUST be painted white and the car number must be clearly visible on each piece.
8.05.2 Weight may not be added ahead of the front spindles, or behind the rear axle. Weight may not be located inside the driver’s compartment. Weight may not be added to the outside of the frame rails. A weight box may be welded to the frame rail and house added weight. Devices for shifting weight not permitted at any time.
8.05.3 Dislodged weight cannot be returned to cars for weighing after an event.
8.06 Window net and Seat Belts
8.06.1 A nylon window net must be installed in the left side window opening and be positioned to cover entire window opening. The window net must be rib type, made from a minimum 3/4“, maximum 1” wide nylon material with a minimum of 1” and a maximum of 2-1/4 square openings between the ribs. The minimum window net size is 22 inches wide by 16 inches high. All window net mounts must be a minimum 1/2 “diameter solid steel rod on the bottom and a minimum 1” wide by 3/16” thick flat steel or 1/2” diameter solid steel rod on the top with mounts welded to the roll cage. The window screen when in the closed position must fit tight and be secure with lever-type quick release latch acceptable to Magic Valley Speedway officials. The lever must be secure by a detent ball in the lever or may be supplemented by a Velcro fastener only. Pins or clips will not be permitted. The latch must be located at the top in the front of the roll bar and release from the inside. Five point racing seat belt required. Metal to metal buckles required. Seat belts must be mounted securely to roll cage. Seat belts must be no older then 2 years. All drivers will be required to run a head & neck device of their choice. Donut neck braces wont comply.
8.07 Dash Panel:
8.07.1 Cars must have a complete dash with no offset, and be the width of dash bar.
8.07.2 Dash panel must be constructed with steel or aluminum.
8.08 Firewalls:
8.08.1 All holes in front and rear firewalls must be sealed. Full firewall must be constructed with minimum 24-gauge magnetic steel. Required for Division I (Late Model), recommended for Division II (Modified). Firewall must extend from the top of dash to the bottom of the frame rail on both sides. Rear firewall must be constructed of 24-gauge magnetic steel, (Required for Division I (Late Model), recommended for Division II (Modified)) and completely seal the driver’s cockpit from fuel cell compartment.
8.09 Identification and Marking:
8.09.1 All head light, grill, decals optional.
8.09.2 MVS reserves the right to assign or restrict the display of decals, identification, and advertising on racecars.
8.09.3 Numbers must be at least 18” inches high and neatly lettered on both sides of the car in the center of the door. The top front corner of each door should be available for the placement of series sponsor decals. A number 24” inches high must be on the roof, reading from the passenger side. Decals or painted numbers are permissible. All racecar numbers will be issued through MVS. Absolutely NO X’s, duplicate numbers or triple digit numbers allowed at anytime. Numbers six inches in height must be attached to the right front headlight area, and also the right rear taillight area. Both divisions.
8.09.4 Contingency sponsor decals must be in place to receive awards, or prize money from contingency sponsors. Series and contingency sponsor patches must be worn to receive awards.
8.10 General Engine Requirements
8.10.1 The only approved sealed crate motor is G.M. part number is 88958602, GM part number 88958602 will be the only approved engine for competition at Magic Valley Speedway in this class. Engine must remain sealed at all times. Any engine altered or modified in any way without prior written approval, of MVS, will result in permanent suspension of that driver from all weekly racing series divisions at Magic Valley Speedway for no less than one calendar year. This includes but not limited to seal bolts, valve springs, rocker arms, shimming altering or relocating any part from its original configuration. The only approved alteration is the water pump, all other parts must remain as the motor came from General Motors. Boise based modifieds with open engines will be allowed with a 15/16 plate per meridian rule book. Size may be adjusted if needed
8.11 Penalties
8.11.1 Any competitor that is determined by the Chief Steward to have tampered with the factory seal on their crate engine will be fined $3000.00 + all purse monies earned for that season. The competitor will lose all season points and be suspended for the remainder of that season and the following season. Suspensions must be served and all fines paid before the competitor can compete at Magic Valley Speedway.
8.12. Engine Ground Clearance Without Driver
8.12.1 Centerline of engine crank must be a minimum ground clearance of 12.00” at Pre Race Tec.
8.13. Engine Mounts:
8.13.1. All mounts must be made of steel or aluminum and be securely bolted.
8.14. Carburetor:
8.14.1 The only Magic Valley Speedway approved carburetor will be a non-made for racing Holley Part # 0-4777 (4150 series) 650 cfm.
8.14.2 Carburetor must be completely unaltered (BOX STOCK) except as noted. Carburetor may be collected by MVS officials and redistributed among competitors at any time, or replaced with track carburetor. Only allowed changes to the Holley 4150 is changing of jets and power valve and removal of the choke butterfly. No other changes or modifications will be allowed. The use of epoxy will be strictly prohibited. Two throttle springs required.
8.14.3 One spacer may be installed between carburetor and intake manifold. Spacer must be made of aluminum, with a maximum height of one half (1/2) inch. Open Plenum only ( 1 hole ).
8.14.4 Only one paper gasket may be installed between the intake manifold and the spacer and one paper gasket installed between the carburetor and the spacer. Gasket must be no larger than the outside diameter of the spacer and not exceed .065” in thickness.
8.15. Air Intake: (air filter):
8.15.1 All air cleaners must be installed before car will be allowed on the racing surface. All air cleaners are subject to approval by Magic Valley Speedway Tech Officials. Air cleaners and air intakes must not alter the outward appearance of the car and must be covered by the hood at all times. Hoods must lay flat no hood scoops. Division II (Modified) cars may have filter exposed above the hood but air filter base assembly must remain below the hood line.
8.15.2 Only a round air filter element 14 inches in diameter will be permitted. The maximum height is 3.5 inches. All air shall be filtered through the filter element. The element, filter assembly, or the area around these items may not be sprayed or soaked with any type of chemical, liquid, powder, or gel. No air flow control hats.K & N top flows OK.
8.15.3 No holes, tubes, funnels, or any device, which may control or redirect the flow of air, is permitted inside the air cleaner, or between the air cleaner and the carburetor.
8.15.4 Only round uncoated metal air filter housings permitted. Cold air boxes are not permitted. It will be permissible to shield the front area of the air cleaner up to a max of one half the circumference and not wider then air filter. Controlled vacuum leaks are not allowed.
8.15.5 Lip of air cleaner assembles may not be more than 1” larger than the filter used.
8.15.6 Absolutely no ducts or hoses permitted on or leading to the air cleaner or element. Only air intake is from cowl. 8.16. Ignition System:
8.16.1 Stock OEM distributors as manufactured with sealed crate motor. Magic Valley Speedway Chief Steward must approve any changes, other than cap and rotor, in writing.
8.16.2 Any make of spark plug and spark plug wires may be used provided it is stock in appearance and function.
8.17. Alternator:
8.17.1. One alternator mounted on the front of the engine in the standard location may be used.
8.18. Battery :
8.18.1 The approved battery must be located in a steel battery box with protection for driver and others. Box must be located between the front spindle and the front firewall or between the rear end housing and the rear firewall on the driver side. No part of the battery box may be lower than the frame rail. The battery mounting must be acceptable to Magic Valley Speedway Tech Officials. Battery must be installed securely within the battery box at all times.
8.18.2 Only one standard automotive 12 volt battery, not to exceed 13.5 volts, will be permitted. Accessories to regulate the power supply will not be permitted
8.19. Electrical Switches and Locations:
8.19.1 All approved switches must be located in the driver’s compartment. Master switch must be mounted in the center of the dash or cockpit.
8.19.2 The on/off master switch must be connected to the battery cable in such a manner that would cut off all electrical power to the car.
8.20. Accessories:
8.20.1 On-board computers, traction control devices, automated electronics, recording devices, cam-recorders or filming devices, telemetry devices, automatic lap scoring/timing devices (other than those issued by Magic Valley Speedway), or digital readout gauges are not permitted. Video cameras may be approved by speedway management tape, disc or recording memory will be the property of Magic Valley Speedway.
8.20.2 Microprocessors or electronic memory chips will not be permitted.
8.20.3 Any car found with an electronic traction control device will subject the driver to a penalty of: suspension for 1 year, and/or be fined a minimum of (One thousand dollars) $1000.00, and result in loss of championship points.
8.21. Radios:
8.21.1 One-way radio communication between driver and Magic Valley Speedway officials is required. Radio will be a receive only radio set to Magic Valley Speedway frequency at all times during practice and competition. One-way receiver radio may be purchased at or Quale Electronics or Mckean Motorsports. The Chief Steward must approve in writing if not. and All microphones must be removed.
8.22. General Cooling System
8.22.1 Engine cooling system must be acceptable to Magic Valley Speedway Tech Officials.
8.22.2 No icing, freon type chemical, liquid spraying systems, or refrigerants may be used in, near, or around the engine compartment. No anti-freeze.
8.23. Water Pump:
8.23.1 Must be an OEM replacement.
8.23.2 No external re-circulators or pumps. Only standard production V-type belts and pulleys or flat v-type belts and pulleys are permitted. No cog type belts or drives.
8.24. Radiator:
8.24.1 Radiator must be stock appearing and be mounted in the upright position. Radiator must be installed in front of the engine, between the frame rails. Aluminum radiators permitted. Radiators with oil coolers will not be permitted.
8.24.2 Aftermarket radiator must not exceed 2 cores and must not be over 4” in thickness. Any non-plastic O. E. M. radiator may be used. Any approved pressure cap may be used.
8.25. Overflow:
8.25.1 An approved overflow system is mandatory.
8.26 ENGINE LUBRICATION
8.26. Oil:
8.26.1 Any oil may be used; however no combustion enhancing additives may be added.
8.27. Oil Filter:
8.27.1 Any single production type oil filter may be used. It may not be remotely mounted.
8.28. Oiling System:
8.28.1 OEM oiling systems only. No external pumps, filters, accumulators or coolers.
8.29. Bell Housing:
8.29.1 Inspection hole is required in bell housing for clutch inspection. An approved scatter shield is mandatory. Bell housing may be no longer than 6 3/8” when measured from the engine mounting flange to the front of transmission, including spacers.
8.30. Drive Shaft:
8.30.1 Only one-piece magnetic steel drive shafts with a minimum diameter of 2”. Minimum drive shaft thickness is 0.060”. Heavy duty, OEM type, universal joints are mandatory.
8.30.2 It is mandatory that two 1/4” x 2” steel drive shaft guards (loops) front and rear be installed in a safe manner and installed so as to prevent the drive shaft from becoming dislodged and falling onto the race track. All drive shafts must be painted white. No aluminum drive shafts.
8.31 Rear Axle and Housing:
8.31.1 Rear end assembly must be stock O.E.M. type. 9" inch Ford rear axle housing allowed.
8.31.2 Axle housing must be made of stock steel. The only modification allowed to the axle tubes are those for narrowing the rear end.
8.31.3 Third member including bearing retainer and yoke must be made of stock steel.
8.31.4 Magnetic steel axles only. Material other than steel is not permitted. Floating hubs and drive plates will be permitted but must be made of magnetic steel. Dust cover may be Alum.
8.31.5 Wheel studs recommended 5/8 inch minimum with 1-inch minimum lug nuts.
8.31.6 Stainless steel axles not allowed. Detroit Lockers, Torque Sensing Type (Gold Track, Diamond Track etc.), or limited slip differentials are not permitted. No wide 5 adapters permitted.
8.31.7 No aluminum spools. Any magnetic steel full or mini spool may be used. No polished or lightened ring, pinion or spool will be permitted. No aluminum rear end parts. Quick-change rear ends not permitted. No cambered rear ends. No crowned axles. No cambered drive flanges. Rear end coolers not permitted.
8.31.8 All rear ends must be mounted using a standard 3 link setup. Rear end housing mounts may have multiple holes
8.31.9 Link mounts on the chassis are allowed slotted mounting holes for adjusting angles.
8.31.10 Upper and lower links must be made of steel tubing with a minimum diameter of no less than 3/4 inch O.D. Lower links may not exceed a maximum length of 30”. Spherical rod ends must be installed on both ends of the links. No rubber, spring, or shock assemblies will be permitted on trailing arms, top link is OK. Coil spring mounts must be welded to the axle tubing. Approved location for both mounts will be in front of, on top of or behind axle tube.
8.31.11 All cars must have soft touch rev control (Part # 8728) purchased from Magic Valley Speedway.
8.31.12 Mounting instructions will be furnished with rev control. Tech inspectors will insert a rev control chip each event- 6200 RPM limit
8.31.13 Soft touch rev control violations will result in a $1000 fine, loss of points and purse for the night, and possible suspension (decided by management)
8.32 Wheels and Lug Bolts:
8.32.1 Only 15-inch diameter five lug magnetic steel wheels with a 8" inch width only.
8.32.2 Wheels must weight a minimum of 19 pounds. No wheel weights or bead locks.
8.32.3 Wheel studs must be ½ inch minimum with 1-inch minimum lug nuts.
8.32.4 The use of bleeder valves is not permitted. One valve stem per wheel.
8.33 Tires:
8.33.1 Only Magic Valley Speedway approved tires, purchased at Magic Valley Speedway or a Magic Valley Speedway authorized dealer are permitted.
8.33.2 Tires that have been altered by unauthorized treatment will not be permitted.
8.33.3 No softening, conditioning, siping or grooving of tires allowed. Penalty will be one-year suspension from Magic Valley Speedway.
8.33.4 All car heights without driver will be measured with a maximum of 20 pounds air pressure in the left side tires and a maximum of 30 pounds air pressure in the right side. Air may be removed at the pre-race inspection line but air may not be added to make ride height. After a car has passed inspection air pressure may be removed, no other adjustments.
8.34 Tire Usage Rules: Hoosier 970
8.34.1 Tire use rule 6 before 1<sup>st</sup> race date on schedule 1 each night you race. Must run 50% of main. If you start after 1<sup>st</sup> race you are allowed 5 to start. No tires banked last 2 races in your class. Fall classic exempt. All tires will be banked before Premier 1st practice on schedule that night or wont be banked.
8.35 Sway Bars (Anti-Roll Bar):
8.35.1 Sway bar components must be made of steel. Sway bars must be one-piece steel only.
8.35.2 Howe type sway bar adjusters are permitted. Sway bar may not be adjustable from inside the car. Sway bar for rear axle not permitted.
8.36 Track Bar:
8.36.1 Bar must mount on back or front of rear axle and to frame rail Adjustable mounts may be installed on both the rear end and the frame.
8.36.2 Bar minimum 1" round tubing .095 wall steel and have hiem joint ends. Quick adjusters allowed but must not be accessible through rear sheet metal.
8.37 Shock Absorbers:
8.37.1 Only one shock per wheel is permitted. Any twin tube steel body shock allowed. No external adjustable shocks allowed. No external reservoir type shocks. Body, piston rod and mounts must be steel. Gas charged shocks not allowed. Shock must not rebound. Shocks that retail for over $150.00 are not permitted. Special pricing not withstanding. If shock is rebuilt, coated or re-worked in any way that increases the investment in the shock to over $150.00 the shock is no longer approved. ( Rebuilding due to damage is permitted) Shocks may be inspected at any time. Shocks must be approve by MVS officials.
8.38 A-Frames:
8.38.1 All upper A-arms and cross shafts must be made of magnetic steel.
8.38.2 Upper arms may be adjusted with washers, shims or slugs for caster and camber. Aluminum shims permitted. Any upper magnetic steel A-arm (tubular arms permitted).
8.38.3 Lower A-arm ball joints may be an adjustable magnetic steel type.
8.38.4 Lower A-arms must be stock or OEM replacement and mounted in stock location. Lower A-arms must be same length & Unaltered OEM. Lower A-arm bushings must be stock, rubber, polyurethane, steel or delron plastic, only. Offset bushings or slotted adjustments will not be permitted in lower A-frames. Mono Balls will be permitted on the upper control arms only.
8.39 Spindles, Wheel Bearings and Hubs:
8.39.1 Any stock forged or cast iron OEM front spindle.
8.39.2 Hubs and rotors must be magnetic steel.
8.39.3 One-piece front hub and rotor assembly or one-piece aftermarket stock type equivalent permitted. No scalloped, cross drilled or slotted rotors will be permitted.
8.40 Tread Width Requirements:
8.40.1 Front and rear tread width shall be measured from outside of tire rubber to outside of tire rubber at 78". Per Track Referee at spindle height of 75". MVS referee is final.
8.40.2 Wheel spacers may be used to get the maximum allowable tread width. Steel or aluminum permitted ½” Maximum per wheel.
8.41 Ground Clearance Requirements: Without Driver
8.41.1 No part of the chassis or body shall be lower then 4” at pre-race inspection. All cars will be measured with a maximum of 20 pounds air pressure in the left side tires and a maximum of 30 pounds air pressure in the right side. Air may be removed at the pre-race inspection line but air may not be added to make ride height. After a car has passed inspection air pressure may be removed, no other adjustments will be permitted.
8.41.2 Exhaust must not drag track during races . The oil pan is exempt from ground height rule but minimum crank height must be maintained at the front and rear of the crank. Sway Bar and Sway bar mounts must be no lower than 3 ".Belly pans not permitted.
8.42 Car Height Adjusting Devices:
8.42.1 Front and rear suspension weight jacking bolts permitted but may not be adjustable from the inside of the car.
8.43 Steering:
8.43.1 All steering components including tie rod sleeves must be steel. A-arm shims excluded.
8.43.2 Tie rods and steering boxes, must be stock OEM parts.
8.43.3 Drag link must be stock OEM or Howe part number 23396 no other drag link will be permitted. When Howe drag link is used Moog tie rod end part numbers ES150L and ES150R will be permitted when attached to the drag link and a heim joint may be attached to the spindle. Steering box must remain in original location. No rack and pinion steering permitted.
8.43.4 Magnetic steel Heim joints will be allowed ONLY at outer tie rod ends to spindles.
8.43.5 An approved all metal quick-release steering wheel coupler may be used.
8.43.6 Center of steering wheel must be padded with 2” of resilient material.
8.43.7 All steering columns are required to have a collapsible section or have two (2) unsupported universal joints. Recommended Ă‚Âľ inch x .120 wall tubing. Steering wheel must be spoke style.
8.43.8 Stock type power steering pump must be mounted in the stock location on the front of the engine when used. All power steering lines must be high pressure line.
8.44. Brakes and Cooling Components
8.44. Brake Components:
8.44.1 Four wheel hydraulic brakes in good operating condition are mandatory. Four wheel disc brakes recommended. No aluminum brake drums permitted. Drilling or coating of any drum or rotor is not permitted.
8.44.2 Stock OEM single piston magnetic steel brake calipers only. Front calipers must mount in stock location. Rear calipers may be mounted in front of or behind rear axle assembly. Both calipers must remain on the same side of the axle assembly and be mounted parallel to each other.
8.44.3 Brake adjustment allowed either proportioning valve or balance bar adjustment in the driver’s compartment within reach of the driver will be permitted.
8.44.4 When master cylinders are mounted in driver compartment they must be completely incased.
8.44.5 Electric brake actuators are not permitted. Any brake pedal and master cylinder assembly permitted. No carbon fiber components.
8.44.6 Minimum rotor size: Front: 0.750” x 11.750”. Minimum rotor size: Rear: 0.750” x 11.750”. Metric front rotors may be a minimum of .750” x 10.50”. Only round magnetic cast or steel one piece rotors are permitted. Scalloped or cross drilled rotors are not permitted.
8.45. Fuel
8.45.1 All cars must run automotive pump gas only.
8.45.2 Gasoline shall not be blended with alcohols, ethers, or oxygenates and it shall not be blended with aniline or its derivatives, nitro compounds, or other nitrogen containing compounds.
8.45.3 No cooling or icing of any fuel or component. Nitrous oxide prohibited.
8.46 Fuel System
8.46.1 All cars must be equipped with an approved fuel cell. 22 gallons Maximum.12 gallons Minimum. A fuel cell check valve is mandatory. Kevlar cell bladder is allowed. Cell must be full of fuel cell foam.
8.46.2 It is mandatory that all fuel cell bladders used be manufactured within the last five years.
8.47 Fuel Cell Container:
8.47.1 The fuel cell must be completely enclosed in a steel container (box), minimum 22-gauge,
8.48 Fuel Cell and Fuel Container Installation:
8.48.1 Fuel cell must maintain a minimum of 8" inches off the ground at all times. Cell shall be securely mounted in the trunk area as far forward as possible. Fuel cells must be mounted centered equal distance between frame rails.
8.48.2 A steel framework, welded to frame rails, must be used to mount fuel cell. This framework must be fabricated from a minimum of 1” x 1” x .065 square tubing.
8.48.3 Straps must also be bolted or welded to the steel framework. A minimum of two (2) straps lengthwise and two (2) straps crosswise must completely encircle the fuel cell. The minimum material for this strap is 1” x 1” x .065” inch square tube. Fuel cell may not be within (1) inch of rear frame cross member. The fuel cell container support frame must be magnetic steel meeting the ASTM A-500 specifications.
8.48.4 A 1/8” steel plate must be attached to the front and rear of the outside of the fuel cell frame work from top to bottom and must be as wide as the fuel cell. A fuel cell protector bar made from a minimum of one and one-half (1-½) inch by .090 steel tubing is required. The length must be greater than the width of the fuel cell, and must extend lower than the fuel cell.
8.49 Fuel Filler and Vent Requirements:
8.49.1 A fuel vent check valve is mandatory. Filler spout must remain in the trunk area sealed off from driver. Fuel cell vent hose maximum 1” inch, and hose must extend to outside at left rear taillight area. A fuel vent flap valve is mandatory at all times.
8.50 Fuel Lines:
8.50.1 Only one fuel line from fuel cell to fuel pump is permitted.
8.50.2 Fuel line can’t run through drivers compartment.
8.50.3 Fuel Line must be for racing no rubber lines.
8.51 Fuel Pump:
8.51.1 No electric fuel pumps permitted. Only OEM type mechanically driven fuel pump allowed.
8.51.2 Fuel pump must be mounted in stock location.
8.52 Fuel Filter:
8.52.1 Any Approved gas filter may be used. Maximum capacity of 1 quart (US) allowed.
8.52.2 Single pass filters only. Glass fuel filters not permitted.
8.53 Fuel Filler Cans:
8.53.1 It is required that fuel be stored in an approved container.
8.54 Notice Magic Valley Speedway reserves the right to exchange any crate motor in the interest of competition. Magic Valley Speedway also reserves the right to confiscate any crate motor and have it placed on a dyno of our choice.
Any part of equipment found during an inspection or any other time at any MVS event that does not meet applicable Magic Valley Speedway standards, must be surrendered to the Magic Valley Speedway Tech Officials at that time, and will not be returned. Failing to do so will result in; a fine, and/or loss of championship points, and/or definite or indefinite suspension from MVS in all classes or series.
Magic Valley Speedway Tech Officials reserve the right to make final decisions in the interpretation of any rules or race procedures at any time. No equipment will be considered as having been approved by reason of having passed through inspection. Magic Valley Speedway Tech Officials recommend that you carefully study the MVS Rule Book in order to be familiar with all aspects Stockcar racing. If you are considering a part, modification or procedure not covered in these rules contact the Magic Valley Speedway Chief Steward before proceeding with any purchase or modification. If you have any questions regarding the rules set forth, contact the Magic Valley Speedway Chief Steward
In keeping with Magic Valley Speedway’s commitment to maintaining proper balance in the competition arena, it may be necessary for Magic Valley Speedway to make rule changes and/or rule modifications from time to time. Such changes are designed to enhance close competition. Magic Valley Speedway’s goal of a full starting field of various car makes in each race that are equally matched as possible is certainly in the overall best interest of the sport.
Division 1
7.01. Competing Model
7.01.1 Cars eligible for this class must meet all of the rules described in section 1 of the Magic Valley Speedway rule book, all of the rules in section 8 of the Magic Valley Speedway rule book and all of the following rules listed in this section (section 7).
7.01.2 Open to stock appearing automobiles provided they comply with, and adhere to, specifications as outlined for this division.
Any approved car body Make and Model may be used on approved chassis.
7.01.3 Engines may be interchanged among body make.
7.01.4 Competing models as selected by Magic Valley Speedway. The following 2002 AND newer cars are the only eligible models approved for competition.
7.01.5 CHEVROLET Monte Carlo
7.01.6 DODGE Intrepid
7.01.7 FORD Thunderbird, Taurus
7.01.8 PONTIAC Grand Prix
7.01.9 All bodies must be asphalt type, no wedge, dirt or down force bodies will be permitted.
7.02. GENERAL CAR AND BODY REQUIREMENTS
7.02 General Car:
7.02.1 The ABC Rulebook guidelines will be used at Magic Valley Speedway; all mounting will use the ABC “Installation Guidelines”. ( Stock steel bodies allowed)
7.02.2 Cars must be neat appearing. All panels must fit properly and be free of sharp edges. All panels must be painted. The bodies will be required to fit the ABC body template. Bodies must be standard as produced by aftermarket manufacturer and meet ABC guidelines.
7.02.3 No fillers or tape on body seams. No lightweight body parts.
7.02.4 Kevlar, titanium, carbon fiber, light weight and ceramic-coated body parts not permitted.
7.03. DETAILED CAR BODY REQUIREMENTS In addition to the car body requirements in section 2 of the ABC Rule Book.
7.03.1 ABC Rulebook will dictate all body requirements. In the event of obvious conflicts the Magic Valley Speedway Rulebook will supersede the ABC rulebook.
7.03.2 Spoiler must meet ABC guidelines option #1.
7.04 Grilles:
7.04.1 Openings must retain the same shape and size as the stock production.
7.05. DETAILED ENGINE REQUIREMENTS
7.05.1 Engine Location:
7.05 2 All engines must be located so the forward most spark plug is up to a maximum of 1.5” behind the center-line of the upper ball joints. Centerline of crankshaft must be within 1" of frame rails centerline.
7.06. ENGINE/CAR ELECTRICAL SYSTEM
7.06.1 Starters must remain in stock location. Only factory OEM type starters allowed.
7.06.2 The self-starter must be in working order and located in the bell housing. All cars must start under their own power. After racing is underway, cars may be restarted by means of pushing in the pit area only; but under no circumstances is any car to be pushed onto the track from the pit area.
7.07. Fan:
7.07.1 If a fan is used it must be electric.
7.07.2 All fans must be mounted on the engine side of the radiator parallel to the radiator.
7.08. Radiator air Ducts:
7.08.1 One 4” X 6” piece of clear lexan must be installed on the top of the air intake box ahead of the radiator for inspection.
7.08.2 If ducting is used to direct air into the radiator, it must be concealed behind nose panel and not affect overall appearance of car. No ducting will be permitted towards the engine.
7.09. ENGINE EXHAUST SYSTEM
7.09.1 All headers must be 1 5/8” non-step tubes and 3” collectors. No cones or pyramids allowed.
7.09.2 Header spacers are not permitted. No thermal wraps allowed.
7.09.3 Only one gasket, maximum .075-inch thickness, may be used between the cylinder head and header. Header must bolt to head.
7.10. Exhaust Pipes:
7.10.1 Only header PNs allowed is Schoenfeld 151CM, 151 ECM, 151 ELCM, 135CM.
7.10.2 Exhaust pipes from header to the muffler (or 2 into 1 collector) shall be no larger than three (3") inches in outside diameter OD.
7.10.3 The exhaust pipe exiting the muffler (or 2 into 1 collector) shall be no larger than three (3") inches OD. Two-into-one merge collectors are required.
7.10.4 Pipes must be securely fastened to manifold or headers and attached to frame in a minimum of two (2) bolts to frame.
7.10.5 Exhaust pipes must extend past driver and exit the outside of car on the passenger side no more than 12” ahead of rear tire opening. Exhaust pipes must be equipped with a flash shield no larger than 12” X 12” with a center opening extending no more than 6” inside the body panel. Recommended design will allow the exhaust pipe to float inside the flange. No exhaust parts may protrude outside the body. Thermal wraps or coatings not permitted on any part of the exhaust.
7.11. Heat Shields:
7.11.1 No heat shields permitted.
7.12. Mufflers:
7.12.1 Exhaust must be capable of maintaining a maximum of 98 DECIBELS AT 75 FEET. If a car should exceed the maximum decibel level, at any time, it may be disqualified until an acceptable noise level is attained. Mufflers must be in place at all times.
7.12.2 Cars losing mufflers or exhaust pipes during an event will not be allowed to continue.
7.12.3 All exhaust must pass through the muffler and exhaust pipe.
7.12.4 Magic Valley Speedway Tech Officials must approve all exhaust systems and installations.
7.13. DRIVE TRAIN CLUTCH:
7.13. Clutch:
7.13.1. Heavy duty clutch and pressure plate recommended.
7.13.2. Clutch pressure plate limited to magnetic steel only.
7.13.3. Clutch disc must have magnetic steel hub. Clutch disc face must be a functional full circle fiber with a minimum diameter of 7.25”. No button clutches. No cone, coupler or dog-ear type allowed.
7.13.4. An approved multi disc clutch may be used. The Chief Steward must approve any multi disc assembly.
7.13.5. Clutch must be located in bell housing and bolted to flywheel or flex plate.
7.13.6. All cars must have a working clutch.
7.14. Flywheel:
7.14.1 The flywheel or flex plate must be made of magnetic steel and bolted to the crankshaft and be of stock type and diameter. Ring gear must be a minimum of 12-7/8" inches diameter.
7.14.2 Starter ring gear must be attached to flywheel or flex plate.
7.15. Transmission:
7.15.1 Transmission must be OEM stock production 3 or 4 speed only. No Aftermarket Transmissions. No made for racing transmissions. Transmission must be located in stock location.
7.15.2 Manual transmissions only. Must have 1 forward and 1 reverse gear working.
7.16. FRAME REQUIREMENTS (CHASSIS)
7.16.1 All chassis must be constructed using an unaltered Howe part number 358-8-01, a Port City part number 100 2-205 or a CSC racing part number SP-12-clip fabricated clip or a victory circle part # VCC 02-8055 tube clip or a stock stub clip (see rule 7.16.2 for stock clip. requirements). No other clip configuration will be approved. Mounting points may not be altered in any way. Serial numbers may not be altered or removed.
7.16.2 Cars running a stock clip must meet the following requirements ; Magic Valley Speedway Officials must approve all clips. All stock clips must be G. M. Metric, Chevelle, Monte Carlo , or Camaro. No other clip or stock stub will be permitted. Cross member must remain in the stock location. The only modification to the cross member will be for oil pan and fuel pump clearance. Beginning a minimum of 22 inches rearward of the centerline of the spindles and extending forward of the radiator, clip must be as produced by General Motors. Spring buckets may be altered for spring clearance but must remain in the stock location. Upper control arm mounts may be replaced to accept tubular A-arms. Replacement upper control arm mounts must be made of magnetic steel. No strut cars will be allowed. All cars must run a complete frame. All frames must be constructed of no less than 2” X 3” X .083 box tubing. No holes may be cut in the frame for lightning purposes. No modifications will be permitted. When repairing damage all original configurations must be followed. Weight penaltys will be enforced for excessive cutting on stock clips.
7.16.3 MVS officials must approve all chassis before allowed to take the track.
7.16.4 All cars must run full coil springs. Minimum spring diameter is 5”, Maximum spring diameter is 5 ¾”
7.17 Materials
7.17.1 Aluminum suspension parts are not permitted.
7.18 Wheelbase Requirements:
7.18.1 All cars must compete with a minimum 103” wheelbase.
7.19 Roll Bars:
7.19.1 A full roll cage is required. When repairing chassis all original configurations must be followed.
7.20 The following rules will apply for the 2008 racing season only. These rules are designed to allow the purchase of race cars outside of the Magic Valley and are not designed to encourage a person to build this type of car as the preceding rules will apply for the 2008 season.
7.20.2 Non ABC Bodies will be permitted but must meet the years, make and model listed in rule number 7.01. in addition all bodies must be neat in appearance. These bodies are subject to the chief steward’s approval and will be required to meet many of the body measurements using the referee.
2.02 Roll Cages
2.02.1 Must consist of continuous hoops not less than 1.625 inch outside diameter and must have a minimum wall thickness of at least .095. Must be frame-mounted in at least six (6) places. Roll bar padding required in driver’s compartment.
2.02.2 Must consist of a configuration of front and rear hoops connected by tubing on the sides or side hoops. Driver’s head must not protrude above cage with helmet on and strapped in driver’s seat. Must have minimum of one cross bar in top halo of roll cage. Roll cage must be securely supported, and braced. Low carbon, mild steel tubing recommended. No brazing or soldering allowed.
2.02.3 Protection of feet mandatory. Bar across back of engine with vertical bars and rub rails, or similar protection. No brace bars forward of cage may be higher than stock hood height. Main cage may be no further forward than the engine plate.
2.02.4 Minimum of three driver side door bars, at least 1 ½” in diameter, must be as parallel to the ground as possible, and located perpendicular to the driver so as to provide maximum protection for driver, but without causing undue difficulty in getting into or out of the vehicle. The sidebars must be welded to the front and rear of the roll cage members. Must have at least one cross door bar, minimum 1.25 inch OD, on passenger side of car, either horizontal or angled.
2.03 Exhaust
2.03.1 Exhaust must be mounted in such a way as to direct spent gasses away form cockpit and away from areas of possible fuel spillage. All exhaust must pass through the mufflers. Cars must not exceed 98 db at 75 ft. Cars not meeting 98 db rule will start scratch if not corrected before race time. Headers must be totally independent of each other. One header must be attached to cylinders 1, 3, 5, and 7 and be collected into one collector. The other header must be attached to cylinders 2, 4, 6 and 8 and be collected into one collector. Each header must have its own muffler. Headers, exhaust pipes and mufflers must remain totally independent and may not attach in any way. Modified cars will have the option of meeting rule number 7.12.1 through 7.12.4.
2.04 Frames
2.04.1 Factory production complete full 1960 or newer parallel American passenger car frames only. No front clip or tube type frames allowed. Frames may be cut in rear only at point not further than 36” from center or rear end housing. Frames may not be widened or narrowed and must be able to support roll cage on both sides. Must be full and complete both sides. Front cross member may be notched for radiator and/or steering clearance only. Minimum frame and body height from ground is 4”. (except front cross member and a minimum oil pan clearance of 3”.) Maximum 2 inch wide by 4-inch tall frame stiffener may be welded directly to the outside of frame rail. Height will be measured with the driver out of the car with no lifting or manipulation of the suspension allowed. The car may be measured anytime before the car enters the racing surface.
2.04.2 Tube-type upper A-frames allowed and can be moved from stock location. No coil over shocks allowed. No homemade coilovers allowed on car. No Jeep, Bronco (etc.) or 4 wheel drive frames allowed. No sports car frames allowed. No front wheel drive cars allowed.
2.04.3 Rear of frame may be altered to accept leaf or coil springs: any coil spring must be at least 4 ½ “ outside diameter. One steel spring per wheel only. No torsion bars allowed in rear. No Progressive springs allowed.
2.04.4 No hydraulic, ratchet or electric weight jacks allowed. No air shocks or air bags allowed.
2.04.5 Minimum wheelbase is 108 inches. No aluminum or fiberglass suspension or rear-end parts allowed. Stock front clips only. No titanium products, parts or components allowed anywhere on race car.
2.04.6 Cockpit steering may be altered, but must remain on left side. No center steering.
2.04.7 No aluminum suspension parts allowed, front or rear. Including but not limited to hubs, calipers, “A” frames, mounting brackets, nuts, bolts. All components of the front and rear suspension must be magnetic steel. Alum Upper control arms spacers permitted.
2.05 Bodies
2.05.1 1970 or newer American compact passenger cars only (no panel wagons or station wagons). Stock appearing front windshield and rear window support unit. May utilize a half-windshield (flat, no wings) mounted to roll cage. Must have a minimum of three windshield bars in front of driver. Cowl panel in front of driver can be no wider than cockpit and no farther back than the steering wheel.
2.05.2 Firewall and floorboards are mandatory with a minimum .125 aluminum or 16 gage steel complete floor required. Fiberglass or metal duplicates of body parts are permitted. Handmade body parts may be constructed of steel, aluminum, or fiberglass, but must be recognizable as factory production copy. All cars must be completely painted. No plastic body parts allowed. Body must be same width, front to rear, and parallel to the frame.
2.05.3 Original roofline of vehicle must be maintained. Must be steel or fiberglass full size roof. No wings, spoilers, or any other ground effects are allowed anywhere outside or inside car. No car covers or covers on suspension parts.
2.05.4 Engine compartment must remain open. No side panels. Maximum hood scoop height is 6”. Hood sides may have 4” maximum drop and must be enclosed at rear of hood. Bodies may not extend forward past back of block. No panel in front of right door to engine compartment. No inner panels. No gun drilled, tubular or hollow bolts or studs allowed anywhere on car.
2.05.5 Driver and passenger side windows on both sides of car must have at least 12” vertical opening. Left side window net mandatory see rule 8.06.1 Arm restraints recommended.
2.06 Transmission, Rear end
2.06.1 Only OEM production 3 speeds, 4 speeds, or automatic transmissions will be allowed. No “in and out” boxes, five speed or six speeds allowed. Functioning shifter must be in stock location on transmissions manufactured after 1995.
2.06.2 Transmissions must have at least one forward, one reverse, and a neutral. With motor running and car in still position, driver must be able to engage car in gear and move forward, then backward.
2.06.3 Manual gear-type transmissions must have a standard OEM case and must have a working disc-type clutch. One 1” inspection hole is required in the bell housing. An approved scatter shield is mandatory. Automatic transmissions must remain in OEM stock appearing automatic case with a functioning stock appearing pump. The original bell housing must remain. Automatic transmissions must have an approved scatter shield or blanket. May be constructed of ¼” by 3” steel, 270 degrees around flexplate or flywheel. All Automatic transmissions will be required to run a fluid filled working torque converter. Torque converter must have a minimum diameter of 11” and a maximum stall speed of 3000 RPM.
2.07 Bumpers
2.07.1 Center of top bumper bar, front and rear, must be 16 to 20 inches from ground. Steel bumpers must be used in front and rear at all times and be securely mounted with minimum of .375-inch bolts. Two-bar front bumpers must be mounted frame end-to frame end, with the bottom loop parallel to the ground. Top bar must be directly above bottom bar, a minimum 6.5-inches apart, measured center to center at front bumper, so bumper is perpendicular to ground. Must be made of minimum 1.25 inch tubing .065 wall thickness and .095 wall thickness in the rear and must be able to support car if lifted by wrecker.
2.07.2 Rear bumper, steel nerf bars and bodies must not extend beyond width of rear tires, and must not contain any sharp edges. Rear bumper may be no more than 2 inches wider than the body on each side. Rear bumper must protect fuel cell.
2.07.3 Rear bumper must resemble one of three configurations- (1) Straight bumpers can be no wider than 5 inches outside each frame rail. (2) If the bumper is wider than 5 inches outside the frame rail, it must be bent forward on the ends at a 90-degree angle. (3) A bumper constructed in loop design.
Because someone had a problem with it in the past and they wanted to regulate it for some reason.
You keep saying noone is giving factual information. I gave factual information. You're giving oppinions.
#1 & #2 Why do they make all of the rules they make? They all have to go by certain rules in competitions. Look at some of these crazy regulations
QUOTE
All cars competing in the Pepsi Premier Division must conform to all of the rules in this section
NOTICE: ALL EQUIPMENT IS SUBJECT TO THE APPROVAL OF MVS TECH OFFICIALS. NO EQUIPMENT WILL BE CONSIDERED AS HAVING BEEN APPROVED BY REASON OF HAVING PASSED THROUGH INSPECTION. ALL MVS MEMBERS ARE REQUIRED TO BE FAMILIAR WITH ALL MAGIC VALLEY SPEEDWAY TRACK RULES, GENERAL RULES PERTAINING TO YOUR DIVISION.
ANY MODIFICATION NOT COVERED IN THESE RULES WILL NOT BE ALLOWED UNLESS APPROVED BY THE MAGIC VALLEY SPEEDWAY CHIEF STEWARD IN WRITING.
Division 1 = Late Model, Division 2 = Modified. MVS= Magic Valley Speedway
8.01 General Safety
8.01.1 For all safety devices it is the responsibility of the driver, not Magic Valley Speedway, or its
officers, or its agents to ensure his/her safety device systems are correctly installed, maintained
and properly used at all times. As with all safety items Magic Valley Speedway strongly recommends that the driver carefully study all manufacturers’ installation and usage guidelines and adhere to these recommendations to the highest extent possible.
8.01.2 Steel doorplate, 18 gauge or .049-inch minimum thickness must be securely welded to the door bars on driver’s side. Plate must cover the area from the top door bar to the bottom door bar and from the rear down post to five inches in front of the seat, must be visible for inspection.
8.02 Floorboards:
8.02.1 Floorboard must extend from the front firewall to the main (roll cage bar) behind the driver. Floorboard height must not exceed 12” measured from bottom of chassis. All holes in floor must be sealed. Floorboard and transmission tunnel must be a minimum of 11-gauge steel and must be welded to the chassis. Required for Division I recommended for Division II.
8.02.2 Floorboards and transmission tunnels must be welded in place and show good workmanship and subject to approval of Magic Valley Speedway tech officials. Required for Division I recommended for Division II
8.03 Interiors:
8.03.1 Interior must be completely open, no enclosing passenger side. MVS ride along car exempt. Interior panels must be trimmed neatly around roll cage and sealed for fire protection.
8.03.2 Roll bar padding must be installed anywhere the driver may come in contact.
8.03.3 Interior panels except crush panels must be fabricated of 24-gauge steel minimum and recommended that all interior panels be welded in place. Required for Division I recommended for Division II. Interior holes must be sealed.
8.03.4 Interior panels at right of driver from door bars in must direct down toward floor tunnel.
8.04 Overall Car Weight:
8.04.1 Minimum car weight including driver is 2,950 at Pre race inspection. Division II cars must weigh a minimum of 2,550 pounds at Pre race inspection. Maximum Left side weight is 58% for mods and 56% for late models including driver with both hands on steering wheel with belts and helmet on. Cars may be weighed after main events. THIS RULE, AS ALL OTHERS, MAY BE RECINDED OR CHANGED AS DEEMED NECESSARY TO IMPROVE COMPETITION AT ANY TIME.All cars will be weighed on Magic Valley Speedway’s scales. These scales will be the only method for determining a car’s weight.
8.05 Added Car Weight:
8.05.1 Added weight must be in block form of no less than 5 pounds. No lead shot or liquid ballast will be permitted. All added weight must be in a tube or securely bolted in place with a minimum of 2 (½-inch) diameter, grade 5 bolts with locking nuts. No aluminum brackets. All added weight MUST be painted white and the car number must be clearly visible on each piece.
8.05.2 Weight may not be added ahead of the front spindles, or behind the rear axle. Weight may not be located inside the driver’s compartment. Weight may not be added to the outside of the frame rails. A weight box may be welded to the frame rail and house added weight. Devices for shifting weight not permitted at any time.
8.05.3 Dislodged weight cannot be returned to cars for weighing after an event.
8.06 Window net and Seat Belts
8.06.1 A nylon window net must be installed in the left side window opening and be positioned to cover entire window opening. The window net must be rib type, made from a minimum 3/4“, maximum 1” wide nylon material with a minimum of 1” and a maximum of 2-1/4 square openings between the ribs. The minimum window net size is 22 inches wide by 16 inches high. All window net mounts must be a minimum 1/2 “diameter solid steel rod on the bottom and a minimum 1” wide by 3/16” thick flat steel or 1/2” diameter solid steel rod on the top with mounts welded to the roll cage. The window screen when in the closed position must fit tight and be secure with lever-type quick release latch acceptable to Magic Valley Speedway officials. The lever must be secure by a detent ball in the lever or may be supplemented by a Velcro fastener only. Pins or clips will not be permitted. The latch must be located at the top in the front of the roll bar and release from the inside. Five point racing seat belt required. Metal to metal buckles required. Seat belts must be mounted securely to roll cage. Seat belts must be no older then 2 years. All drivers will be required to run a head & neck device of their choice. Donut neck braces wont comply.
8.07 Dash Panel:
8.07.1 Cars must have a complete dash with no offset, and be the width of dash bar.
8.07.2 Dash panel must be constructed with steel or aluminum.
8.08 Firewalls:
8.08.1 All holes in front and rear firewalls must be sealed. Full firewall must be constructed with minimum 24-gauge magnetic steel. Required for Division I (Late Model), recommended for Division II (Modified). Firewall must extend from the top of dash to the bottom of the frame rail on both sides. Rear firewall must be constructed of 24-gauge magnetic steel, (Required for Division I (Late Model), recommended for Division II (Modified)) and completely seal the driver’s cockpit from fuel cell compartment.
8.09 Identification and Marking:
8.09.1 All head light, grill, decals optional.
8.09.2 MVS reserves the right to assign or restrict the display of decals, identification, and advertising on racecars.
8.09.3 Numbers must be at least 18” inches high and neatly lettered on both sides of the car in the center of the door. The top front corner of each door should be available for the placement of series sponsor decals. A number 24” inches high must be on the roof, reading from the passenger side. Decals or painted numbers are permissible. All racecar numbers will be issued through MVS. Absolutely NO X’s, duplicate numbers or triple digit numbers allowed at anytime. Numbers six inches in height must be attached to the right front headlight area, and also the right rear taillight area. Both divisions.
8.09.4 Contingency sponsor decals must be in place to receive awards, or prize money from contingency sponsors. Series and contingency sponsor patches must be worn to receive awards.
8.10 General Engine Requirements
8.10.1 The only approved sealed crate motor is G.M. part number is 88958602, GM part number 88958602 will be the only approved engine for competition at Magic Valley Speedway in this class. Engine must remain sealed at all times. Any engine altered or modified in any way without prior written approval, of MVS, will result in permanent suspension of that driver from all weekly racing series divisions at Magic Valley Speedway for no less than one calendar year. This includes but not limited to seal bolts, valve springs, rocker arms, shimming altering or relocating any part from its original configuration. The only approved alteration is the water pump, all other parts must remain as the motor came from General Motors. Boise based modifieds with open engines will be allowed with a 15/16 plate per meridian rule book. Size may be adjusted if needed
8.11 Penalties
8.11.1 Any competitor that is determined by the Chief Steward to have tampered with the factory seal on their crate engine will be fined $3000.00 + all purse monies earned for that season. The competitor will lose all season points and be suspended for the remainder of that season and the following season. Suspensions must be served and all fines paid before the competitor can compete at Magic Valley Speedway.
8.12. Engine Ground Clearance Without Driver
8.12.1 Centerline of engine crank must be a minimum ground clearance of 12.00” at Pre Race Tec.
8.13. Engine Mounts:
8.13.1. All mounts must be made of steel or aluminum and be securely bolted.
8.14. Carburetor:
8.14.1 The only Magic Valley Speedway approved carburetor will be a non-made for racing Holley Part # 0-4777 (4150 series) 650 cfm.
8.14.2 Carburetor must be completely unaltered (BOX STOCK) except as noted. Carburetor may be collected by MVS officials and redistributed among competitors at any time, or replaced with track carburetor. Only allowed changes to the Holley 4150 is changing of jets and power valve and removal of the choke butterfly. No other changes or modifications will be allowed. The use of epoxy will be strictly prohibited. Two throttle springs required.
8.14.3 One spacer may be installed between carburetor and intake manifold. Spacer must be made of aluminum, with a maximum height of one half (1/2) inch. Open Plenum only ( 1 hole ).
8.14.4 Only one paper gasket may be installed between the intake manifold and the spacer and one paper gasket installed between the carburetor and the spacer. Gasket must be no larger than the outside diameter of the spacer and not exceed .065” in thickness.
8.15. Air Intake: (air filter):
8.15.1 All air cleaners must be installed before car will be allowed on the racing surface. All air cleaners are subject to approval by Magic Valley Speedway Tech Officials. Air cleaners and air intakes must not alter the outward appearance of the car and must be covered by the hood at all times. Hoods must lay flat no hood scoops. Division II (Modified) cars may have filter exposed above the hood but air filter base assembly must remain below the hood line.
8.15.2 Only a round air filter element 14 inches in diameter will be permitted. The maximum height is 3.5 inches. All air shall be filtered through the filter element. The element, filter assembly, or the area around these items may not be sprayed or soaked with any type of chemical, liquid, powder, or gel. No air flow control hats.K & N top flows OK.
8.15.3 No holes, tubes, funnels, or any device, which may control or redirect the flow of air, is permitted inside the air cleaner, or between the air cleaner and the carburetor.
8.15.4 Only round uncoated metal air filter housings permitted. Cold air boxes are not permitted. It will be permissible to shield the front area of the air cleaner up to a max of one half the circumference and not wider then air filter. Controlled vacuum leaks are not allowed.
8.15.5 Lip of air cleaner assembles may not be more than 1” larger than the filter used.
8.15.6 Absolutely no ducts or hoses permitted on or leading to the air cleaner or element. Only air intake is from cowl. 8.16. Ignition System:
8.16.1 Stock OEM distributors as manufactured with sealed crate motor. Magic Valley Speedway Chief Steward must approve any changes, other than cap and rotor, in writing.
8.16.2 Any make of spark plug and spark plug wires may be used provided it is stock in appearance and function.
8.17. Alternator:
8.17.1. One alternator mounted on the front of the engine in the standard location may be used.
8.18. Battery :
8.18.1 The approved battery must be located in a steel battery box with protection for driver and others. Box must be located between the front spindle and the front firewall or between the rear end housing and the rear firewall on the driver side. No part of the battery box may be lower than the frame rail. The battery mounting must be acceptable to Magic Valley Speedway Tech Officials. Battery must be installed securely within the battery box at all times.
8.18.2 Only one standard automotive 12 volt battery, not to exceed 13.5 volts, will be permitted. Accessories to regulate the power supply will not be permitted
8.19. Electrical Switches and Locations:
8.19.1 All approved switches must be located in the driver’s compartment. Master switch must be mounted in the center of the dash or cockpit.
8.19.2 The on/off master switch must be connected to the battery cable in such a manner that would cut off all electrical power to the car.
8.20. Accessories:
8.20.1 On-board computers, traction control devices, automated electronics, recording devices, cam-recorders or filming devices, telemetry devices, automatic lap scoring/timing devices (other than those issued by Magic Valley Speedway), or digital readout gauges are not permitted. Video cameras may be approved by speedway management tape, disc or recording memory will be the property of Magic Valley Speedway.
8.20.2 Microprocessors or electronic memory chips will not be permitted.
8.20.3 Any car found with an electronic traction control device will subject the driver to a penalty of: suspension for 1 year, and/or be fined a minimum of (One thousand dollars) $1000.00, and result in loss of championship points.
8.21. Radios:
8.21.1 One-way radio communication between driver and Magic Valley Speedway officials is required. Radio will be a receive only radio set to Magic Valley Speedway frequency at all times during practice and competition. One-way receiver radio may be purchased at or Quale Electronics or Mckean Motorsports. The Chief Steward must approve in writing if not. and All microphones must be removed.
8.22. General Cooling System
8.22.1 Engine cooling system must be acceptable to Magic Valley Speedway Tech Officials.
8.22.2 No icing, freon type chemical, liquid spraying systems, or refrigerants may be used in, near, or around the engine compartment. No anti-freeze.
8.23. Water Pump:
8.23.1 Must be an OEM replacement.
8.23.2 No external re-circulators or pumps. Only standard production V-type belts and pulleys or flat v-type belts and pulleys are permitted. No cog type belts or drives.
8.24. Radiator:
8.24.1 Radiator must be stock appearing and be mounted in the upright position. Radiator must be installed in front of the engine, between the frame rails. Aluminum radiators permitted. Radiators with oil coolers will not be permitted.
8.24.2 Aftermarket radiator must not exceed 2 cores and must not be over 4” in thickness. Any non-plastic O. E. M. radiator may be used. Any approved pressure cap may be used.
8.25. Overflow:
8.25.1 An approved overflow system is mandatory.
8.26 ENGINE LUBRICATION
8.26. Oil:
8.26.1 Any oil may be used; however no combustion enhancing additives may be added.
8.27. Oil Filter:
8.27.1 Any single production type oil filter may be used. It may not be remotely mounted.
8.28. Oiling System:
8.28.1 OEM oiling systems only. No external pumps, filters, accumulators or coolers.
8.29. Bell Housing:
8.29.1 Inspection hole is required in bell housing for clutch inspection. An approved scatter shield is mandatory. Bell housing may be no longer than 6 3/8” when measured from the engine mounting flange to the front of transmission, including spacers.
8.30. Drive Shaft:
8.30.1 Only one-piece magnetic steel drive shafts with a minimum diameter of 2”. Minimum drive shaft thickness is 0.060”. Heavy duty, OEM type, universal joints are mandatory.
8.30.2 It is mandatory that two 1/4” x 2” steel drive shaft guards (loops) front and rear be installed in a safe manner and installed so as to prevent the drive shaft from becoming dislodged and falling onto the race track. All drive shafts must be painted white. No aluminum drive shafts.
8.31 Rear Axle and Housing:
8.31.1 Rear end assembly must be stock O.E.M. type. 9" inch Ford rear axle housing allowed.
8.31.2 Axle housing must be made of stock steel. The only modification allowed to the axle tubes are those for narrowing the rear end.
8.31.3 Third member including bearing retainer and yoke must be made of stock steel.
8.31.4 Magnetic steel axles only. Material other than steel is not permitted. Floating hubs and drive plates will be permitted but must be made of magnetic steel. Dust cover may be Alum.
8.31.5 Wheel studs recommended 5/8 inch minimum with 1-inch minimum lug nuts.
8.31.6 Stainless steel axles not allowed. Detroit Lockers, Torque Sensing Type (Gold Track, Diamond Track etc.), or limited slip differentials are not permitted. No wide 5 adapters permitted.
8.31.7 No aluminum spools. Any magnetic steel full or mini spool may be used. No polished or lightened ring, pinion or spool will be permitted. No aluminum rear end parts. Quick-change rear ends not permitted. No cambered rear ends. No crowned axles. No cambered drive flanges. Rear end coolers not permitted.
8.31.8 All rear ends must be mounted using a standard 3 link setup. Rear end housing mounts may have multiple holes
8.31.9 Link mounts on the chassis are allowed slotted mounting holes for adjusting angles.
8.31.10 Upper and lower links must be made of steel tubing with a minimum diameter of no less than 3/4 inch O.D. Lower links may not exceed a maximum length of 30”. Spherical rod ends must be installed on both ends of the links. No rubber, spring, or shock assemblies will be permitted on trailing arms, top link is OK. Coil spring mounts must be welded to the axle tubing. Approved location for both mounts will be in front of, on top of or behind axle tube.
8.31.11 All cars must have soft touch rev control (Part # 8728) purchased from Magic Valley Speedway.
8.31.12 Mounting instructions will be furnished with rev control. Tech inspectors will insert a rev control chip each event- 6200 RPM limit
8.31.13 Soft touch rev control violations will result in a $1000 fine, loss of points and purse for the night, and possible suspension (decided by management)
8.32 Wheels and Lug Bolts:
8.32.1 Only 15-inch diameter five lug magnetic steel wheels with a 8" inch width only.
8.32.2 Wheels must weight a minimum of 19 pounds. No wheel weights or bead locks.
8.32.3 Wheel studs must be ½ inch minimum with 1-inch minimum lug nuts.
8.32.4 The use of bleeder valves is not permitted. One valve stem per wheel.
8.33 Tires:
8.33.1 Only Magic Valley Speedway approved tires, purchased at Magic Valley Speedway or a Magic Valley Speedway authorized dealer are permitted.
8.33.2 Tires that have been altered by unauthorized treatment will not be permitted.
8.33.3 No softening, conditioning, siping or grooving of tires allowed. Penalty will be one-year suspension from Magic Valley Speedway.
8.33.4 All car heights without driver will be measured with a maximum of 20 pounds air pressure in the left side tires and a maximum of 30 pounds air pressure in the right side. Air may be removed at the pre-race inspection line but air may not be added to make ride height. After a car has passed inspection air pressure may be removed, no other adjustments.
8.34 Tire Usage Rules: Hoosier 970
8.34.1 Tire use rule 6 before 1<sup>st</sup> race date on schedule 1 each night you race. Must run 50% of main. If you start after 1<sup>st</sup> race you are allowed 5 to start. No tires banked last 2 races in your class. Fall classic exempt. All tires will be banked before Premier 1st practice on schedule that night or wont be banked.
8.35 Sway Bars (Anti-Roll Bar):
8.35.1 Sway bar components must be made of steel. Sway bars must be one-piece steel only.
8.35.2 Howe type sway bar adjusters are permitted. Sway bar may not be adjustable from inside the car. Sway bar for rear axle not permitted.
8.36 Track Bar:
8.36.1 Bar must mount on back or front of rear axle and to frame rail Adjustable mounts may be installed on both the rear end and the frame.
8.36.2 Bar minimum 1" round tubing .095 wall steel and have hiem joint ends. Quick adjusters allowed but must not be accessible through rear sheet metal.
8.37 Shock Absorbers:
8.37.1 Only one shock per wheel is permitted. Any twin tube steel body shock allowed. No external adjustable shocks allowed. No external reservoir type shocks. Body, piston rod and mounts must be steel. Gas charged shocks not allowed. Shock must not rebound. Shocks that retail for over $150.00 are not permitted. Special pricing not withstanding. If shock is rebuilt, coated or re-worked in any way that increases the investment in the shock to over $150.00 the shock is no longer approved. ( Rebuilding due to damage is permitted) Shocks may be inspected at any time. Shocks must be approve by MVS officials.
8.38 A-Frames:
8.38.1 All upper A-arms and cross shafts must be made of magnetic steel.
8.38.2 Upper arms may be adjusted with washers, shims or slugs for caster and camber. Aluminum shims permitted. Any upper magnetic steel A-arm (tubular arms permitted).
8.38.3 Lower A-arm ball joints may be an adjustable magnetic steel type.
8.38.4 Lower A-arms must be stock or OEM replacement and mounted in stock location. Lower A-arms must be same length & Unaltered OEM. Lower A-arm bushings must be stock, rubber, polyurethane, steel or delron plastic, only. Offset bushings or slotted adjustments will not be permitted in lower A-frames. Mono Balls will be permitted on the upper control arms only.
8.39 Spindles, Wheel Bearings and Hubs:
8.39.1 Any stock forged or cast iron OEM front spindle.
8.39.2 Hubs and rotors must be magnetic steel.
8.39.3 One-piece front hub and rotor assembly or one-piece aftermarket stock type equivalent permitted. No scalloped, cross drilled or slotted rotors will be permitted.
8.40 Tread Width Requirements:
8.40.1 Front and rear tread width shall be measured from outside of tire rubber to outside of tire rubber at 78". Per Track Referee at spindle height of 75". MVS referee is final.
8.40.2 Wheel spacers may be used to get the maximum allowable tread width. Steel or aluminum permitted ½” Maximum per wheel.
8.41 Ground Clearance Requirements: Without Driver
8.41.1 No part of the chassis or body shall be lower then 4” at pre-race inspection. All cars will be measured with a maximum of 20 pounds air pressure in the left side tires and a maximum of 30 pounds air pressure in the right side. Air may be removed at the pre-race inspection line but air may not be added to make ride height. After a car has passed inspection air pressure may be removed, no other adjustments will be permitted.
8.41.2 Exhaust must not drag track during races . The oil pan is exempt from ground height rule but minimum crank height must be maintained at the front and rear of the crank. Sway Bar and Sway bar mounts must be no lower than 3 ".Belly pans not permitted.
8.42 Car Height Adjusting Devices:
8.42.1 Front and rear suspension weight jacking bolts permitted but may not be adjustable from the inside of the car.
8.43 Steering:
8.43.1 All steering components including tie rod sleeves must be steel. A-arm shims excluded.
8.43.2 Tie rods and steering boxes, must be stock OEM parts.
8.43.3 Drag link must be stock OEM or Howe part number 23396 no other drag link will be permitted. When Howe drag link is used Moog tie rod end part numbers ES150L and ES150R will be permitted when attached to the drag link and a heim joint may be attached to the spindle. Steering box must remain in original location. No rack and pinion steering permitted.
8.43.4 Magnetic steel Heim joints will be allowed ONLY at outer tie rod ends to spindles.
8.43.5 An approved all metal quick-release steering wheel coupler may be used.
8.43.6 Center of steering wheel must be padded with 2” of resilient material.
8.43.7 All steering columns are required to have a collapsible section or have two (2) unsupported universal joints. Recommended Ă‚Âľ inch x .120 wall tubing. Steering wheel must be spoke style.
8.43.8 Stock type power steering pump must be mounted in the stock location on the front of the engine when used. All power steering lines must be high pressure line.
8.44. Brakes and Cooling Components
8.44. Brake Components:
8.44.1 Four wheel hydraulic brakes in good operating condition are mandatory. Four wheel disc brakes recommended. No aluminum brake drums permitted. Drilling or coating of any drum or rotor is not permitted.
8.44.2 Stock OEM single piston magnetic steel brake calipers only. Front calipers must mount in stock location. Rear calipers may be mounted in front of or behind rear axle assembly. Both calipers must remain on the same side of the axle assembly and be mounted parallel to each other.
8.44.3 Brake adjustment allowed either proportioning valve or balance bar adjustment in the driver’s compartment within reach of the driver will be permitted.
8.44.4 When master cylinders are mounted in driver compartment they must be completely incased.
8.44.5 Electric brake actuators are not permitted. Any brake pedal and master cylinder assembly permitted. No carbon fiber components.
8.44.6 Minimum rotor size: Front: 0.750” x 11.750”. Minimum rotor size: Rear: 0.750” x 11.750”. Metric front rotors may be a minimum of .750” x 10.50”. Only round magnetic cast or steel one piece rotors are permitted. Scalloped or cross drilled rotors are not permitted.
8.45. Fuel
8.45.1 All cars must run automotive pump gas only.
8.45.2 Gasoline shall not be blended with alcohols, ethers, or oxygenates and it shall not be blended with aniline or its derivatives, nitro compounds, or other nitrogen containing compounds.
8.45.3 No cooling or icing of any fuel or component. Nitrous oxide prohibited.
8.46 Fuel System
8.46.1 All cars must be equipped with an approved fuel cell. 22 gallons Maximum.12 gallons Minimum. A fuel cell check valve is mandatory. Kevlar cell bladder is allowed. Cell must be full of fuel cell foam.
8.46.2 It is mandatory that all fuel cell bladders used be manufactured within the last five years.
8.47 Fuel Cell Container:
8.47.1 The fuel cell must be completely enclosed in a steel container (box), minimum 22-gauge,
8.48 Fuel Cell and Fuel Container Installation:
8.48.1 Fuel cell must maintain a minimum of 8" inches off the ground at all times. Cell shall be securely mounted in the trunk area as far forward as possible. Fuel cells must be mounted centered equal distance between frame rails.
8.48.2 A steel framework, welded to frame rails, must be used to mount fuel cell. This framework must be fabricated from a minimum of 1” x 1” x .065 square tubing.
8.48.3 Straps must also be bolted or welded to the steel framework. A minimum of two (2) straps lengthwise and two (2) straps crosswise must completely encircle the fuel cell. The minimum material for this strap is 1” x 1” x .065” inch square tube. Fuel cell may not be within (1) inch of rear frame cross member. The fuel cell container support frame must be magnetic steel meeting the ASTM A-500 specifications.
8.48.4 A 1/8” steel plate must be attached to the front and rear of the outside of the fuel cell frame work from top to bottom and must be as wide as the fuel cell. A fuel cell protector bar made from a minimum of one and one-half (1-½) inch by .090 steel tubing is required. The length must be greater than the width of the fuel cell, and must extend lower than the fuel cell.
8.49 Fuel Filler and Vent Requirements:
8.49.1 A fuel vent check valve is mandatory. Filler spout must remain in the trunk area sealed off from driver. Fuel cell vent hose maximum 1” inch, and hose must extend to outside at left rear taillight area. A fuel vent flap valve is mandatory at all times.
8.50 Fuel Lines:
8.50.1 Only one fuel line from fuel cell to fuel pump is permitted.
8.50.2 Fuel line can’t run through drivers compartment.
8.50.3 Fuel Line must be for racing no rubber lines.
8.51 Fuel Pump:
8.51.1 No electric fuel pumps permitted. Only OEM type mechanically driven fuel pump allowed.
8.51.2 Fuel pump must be mounted in stock location.
8.52 Fuel Filter:
8.52.1 Any Approved gas filter may be used. Maximum capacity of 1 quart (US) allowed.
8.52.2 Single pass filters only. Glass fuel filters not permitted.
8.53 Fuel Filler Cans:
8.53.1 It is required that fuel be stored in an approved container.
8.54 Notice Magic Valley Speedway reserves the right to exchange any crate motor in the interest of competition. Magic Valley Speedway also reserves the right to confiscate any crate motor and have it placed on a dyno of our choice.
Any part of equipment found during an inspection or any other time at any MVS event that does not meet applicable Magic Valley Speedway standards, must be surrendered to the Magic Valley Speedway Tech Officials at that time, and will not be returned. Failing to do so will result in; a fine, and/or loss of championship points, and/or definite or indefinite suspension from MVS in all classes or series.
Magic Valley Speedway Tech Officials reserve the right to make final decisions in the interpretation of any rules or race procedures at any time. No equipment will be considered as having been approved by reason of having passed through inspection. Magic Valley Speedway Tech Officials recommend that you carefully study the MVS Rule Book in order to be familiar with all aspects Stockcar racing. If you are considering a part, modification or procedure not covered in these rules contact the Magic Valley Speedway Chief Steward before proceeding with any purchase or modification. If you have any questions regarding the rules set forth, contact the Magic Valley Speedway Chief Steward
In keeping with Magic Valley Speedway’s commitment to maintaining proper balance in the competition arena, it may be necessary for Magic Valley Speedway to make rule changes and/or rule modifications from time to time. Such changes are designed to enhance close competition. Magic Valley Speedway’s goal of a full starting field of various car makes in each race that are equally matched as possible is certainly in the overall best interest of the sport.
Division 1
7.01. Competing Model
7.01.1 Cars eligible for this class must meet all of the rules described in section 1 of the Magic Valley Speedway rule book, all of the rules in section 8 of the Magic Valley Speedway rule book and all of the following rules listed in this section (section 7).
7.01.2 Open to stock appearing automobiles provided they comply with, and adhere to, specifications as outlined for this division.
Any approved car body Make and Model may be used on approved chassis.
7.01.3 Engines may be interchanged among body make.
7.01.4 Competing models as selected by Magic Valley Speedway. The following 2002 AND newer cars are the only eligible models approved for competition.
7.01.5 CHEVROLET Monte Carlo
7.01.6 DODGE Intrepid
7.01.7 FORD Thunderbird, Taurus
7.01.8 PONTIAC Grand Prix
7.01.9 All bodies must be asphalt type, no wedge, dirt or down force bodies will be permitted.
7.02. GENERAL CAR AND BODY REQUIREMENTS
7.02 General Car:
7.02.1 The ABC Rulebook guidelines will be used at Magic Valley Speedway; all mounting will use the ABC “Installation Guidelines”. ( Stock steel bodies allowed)
7.02.2 Cars must be neat appearing. All panels must fit properly and be free of sharp edges. All panels must be painted. The bodies will be required to fit the ABC body template. Bodies must be standard as produced by aftermarket manufacturer and meet ABC guidelines.
7.02.3 No fillers or tape on body seams. No lightweight body parts.
7.02.4 Kevlar, titanium, carbon fiber, light weight and ceramic-coated body parts not permitted.
7.03. DETAILED CAR BODY REQUIREMENTS In addition to the car body requirements in section 2 of the ABC Rule Book.
7.03.1 ABC Rulebook will dictate all body requirements. In the event of obvious conflicts the Magic Valley Speedway Rulebook will supersede the ABC rulebook.
7.03.2 Spoiler must meet ABC guidelines option #1.
7.04 Grilles:
7.04.1 Openings must retain the same shape and size as the stock production.
7.05. DETAILED ENGINE REQUIREMENTS
7.05.1 Engine Location:
7.05 2 All engines must be located so the forward most spark plug is up to a maximum of 1.5” behind the center-line of the upper ball joints. Centerline of crankshaft must be within 1" of frame rails centerline.
7.06. ENGINE/CAR ELECTRICAL SYSTEM
7.06.1 Starters must remain in stock location. Only factory OEM type starters allowed.
7.06.2 The self-starter must be in working order and located in the bell housing. All cars must start under their own power. After racing is underway, cars may be restarted by means of pushing in the pit area only; but under no circumstances is any car to be pushed onto the track from the pit area.
7.07. Fan:
7.07.1 If a fan is used it must be electric.
7.07.2 All fans must be mounted on the engine side of the radiator parallel to the radiator.
7.08. Radiator air Ducts:
7.08.1 One 4” X 6” piece of clear lexan must be installed on the top of the air intake box ahead of the radiator for inspection.
7.08.2 If ducting is used to direct air into the radiator, it must be concealed behind nose panel and not affect overall appearance of car. No ducting will be permitted towards the engine.
7.09. ENGINE EXHAUST SYSTEM
7.09.1 All headers must be 1 5/8” non-step tubes and 3” collectors. No cones or pyramids allowed.
7.09.2 Header spacers are not permitted. No thermal wraps allowed.
7.09.3 Only one gasket, maximum .075-inch thickness, may be used between the cylinder head and header. Header must bolt to head.
7.10. Exhaust Pipes:
7.10.1 Only header PNs allowed is Schoenfeld 151CM, 151 ECM, 151 ELCM, 135CM.
7.10.2 Exhaust pipes from header to the muffler (or 2 into 1 collector) shall be no larger than three (3") inches in outside diameter OD.
7.10.3 The exhaust pipe exiting the muffler (or 2 into 1 collector) shall be no larger than three (3") inches OD. Two-into-one merge collectors are required.
7.10.4 Pipes must be securely fastened to manifold or headers and attached to frame in a minimum of two (2) bolts to frame.
7.10.5 Exhaust pipes must extend past driver and exit the outside of car on the passenger side no more than 12” ahead of rear tire opening. Exhaust pipes must be equipped with a flash shield no larger than 12” X 12” with a center opening extending no more than 6” inside the body panel. Recommended design will allow the exhaust pipe to float inside the flange. No exhaust parts may protrude outside the body. Thermal wraps or coatings not permitted on any part of the exhaust.
7.11. Heat Shields:
7.11.1 No heat shields permitted.
7.12. Mufflers:
7.12.1 Exhaust must be capable of maintaining a maximum of 98 DECIBELS AT 75 FEET. If a car should exceed the maximum decibel level, at any time, it may be disqualified until an acceptable noise level is attained. Mufflers must be in place at all times.
7.12.2 Cars losing mufflers or exhaust pipes during an event will not be allowed to continue.
7.12.3 All exhaust must pass through the muffler and exhaust pipe.
7.12.4 Magic Valley Speedway Tech Officials must approve all exhaust systems and installations.
7.13. DRIVE TRAIN CLUTCH:
7.13. Clutch:
7.13.1. Heavy duty clutch and pressure plate recommended.
7.13.2. Clutch pressure plate limited to magnetic steel only.
7.13.3. Clutch disc must have magnetic steel hub. Clutch disc face must be a functional full circle fiber with a minimum diameter of 7.25”. No button clutches. No cone, coupler or dog-ear type allowed.
7.13.4. An approved multi disc clutch may be used. The Chief Steward must approve any multi disc assembly.
7.13.5. Clutch must be located in bell housing and bolted to flywheel or flex plate.
7.13.6. All cars must have a working clutch.
7.14. Flywheel:
7.14.1 The flywheel or flex plate must be made of magnetic steel and bolted to the crankshaft and be of stock type and diameter. Ring gear must be a minimum of 12-7/8" inches diameter.
7.14.2 Starter ring gear must be attached to flywheel or flex plate.
7.15. Transmission:
7.15.1 Transmission must be OEM stock production 3 or 4 speed only. No Aftermarket Transmissions. No made for racing transmissions. Transmission must be located in stock location.
7.15.2 Manual transmissions only. Must have 1 forward and 1 reverse gear working.
7.16. FRAME REQUIREMENTS (CHASSIS)
7.16.1 All chassis must be constructed using an unaltered Howe part number 358-8-01, a Port City part number 100 2-205 or a CSC racing part number SP-12-clip fabricated clip or a victory circle part # VCC 02-8055 tube clip or a stock stub clip (see rule 7.16.2 for stock clip. requirements). No other clip configuration will be approved. Mounting points may not be altered in any way. Serial numbers may not be altered or removed.
7.16.2 Cars running a stock clip must meet the following requirements ; Magic Valley Speedway Officials must approve all clips. All stock clips must be G. M. Metric, Chevelle, Monte Carlo , or Camaro. No other clip or stock stub will be permitted. Cross member must remain in the stock location. The only modification to the cross member will be for oil pan and fuel pump clearance. Beginning a minimum of 22 inches rearward of the centerline of the spindles and extending forward of the radiator, clip must be as produced by General Motors. Spring buckets may be altered for spring clearance but must remain in the stock location. Upper control arm mounts may be replaced to accept tubular A-arms. Replacement upper control arm mounts must be made of magnetic steel. No strut cars will be allowed. All cars must run a complete frame. All frames must be constructed of no less than 2” X 3” X .083 box tubing. No holes may be cut in the frame for lightning purposes. No modifications will be permitted. When repairing damage all original configurations must be followed. Weight penaltys will be enforced for excessive cutting on stock clips.
7.16.3 MVS officials must approve all chassis before allowed to take the track.
7.16.4 All cars must run full coil springs. Minimum spring diameter is 5”, Maximum spring diameter is 5 ¾”
7.17 Materials
7.17.1 Aluminum suspension parts are not permitted.
7.18 Wheelbase Requirements:
7.18.1 All cars must compete with a minimum 103” wheelbase.
7.19 Roll Bars:
7.19.1 A full roll cage is required. When repairing chassis all original configurations must be followed.
7.20 The following rules will apply for the 2008 racing season only. These rules are designed to allow the purchase of race cars outside of the Magic Valley and are not designed to encourage a person to build this type of car as the preceding rules will apply for the 2008 season.
7.20.2 Non ABC Bodies will be permitted but must meet the years, make and model listed in rule number 7.01. in addition all bodies must be neat in appearance. These bodies are subject to the chief steward’s approval and will be required to meet many of the body measurements using the referee.
Division 2
2. Competing Car Type Grand American Modifieds.
2.01.1 Cars eligible for this class must meet all of the rules described in section 1 of the Magic Valley Speedway rulebook, all of the rules in section 8 of the Magic Valley Speedway rule book and all of the following rules.2.02 Roll Cages
2.02.1 Must consist of continuous hoops not less than 1.625 inch outside diameter and must have a minimum wall thickness of at least .095. Must be frame-mounted in at least six (6) places. Roll bar padding required in driver’s compartment.
2.02.2 Must consist of a configuration of front and rear hoops connected by tubing on the sides or side hoops. Driver’s head must not protrude above cage with helmet on and strapped in driver’s seat. Must have minimum of one cross bar in top halo of roll cage. Roll cage must be securely supported, and braced. Low carbon, mild steel tubing recommended. No brazing or soldering allowed.
2.02.3 Protection of feet mandatory. Bar across back of engine with vertical bars and rub rails, or similar protection. No brace bars forward of cage may be higher than stock hood height. Main cage may be no further forward than the engine plate.
2.02.4 Minimum of three driver side door bars, at least 1 ½” in diameter, must be as parallel to the ground as possible, and located perpendicular to the driver so as to provide maximum protection for driver, but without causing undue difficulty in getting into or out of the vehicle. The sidebars must be welded to the front and rear of the roll cage members. Must have at least one cross door bar, minimum 1.25 inch OD, on passenger side of car, either horizontal or angled.
2.03 Exhaust
2.03.1 Exhaust must be mounted in such a way as to direct spent gasses away form cockpit and away from areas of possible fuel spillage. All exhaust must pass through the mufflers. Cars must not exceed 98 db at 75 ft. Cars not meeting 98 db rule will start scratch if not corrected before race time. Headers must be totally independent of each other. One header must be attached to cylinders 1, 3, 5, and 7 and be collected into one collector. The other header must be attached to cylinders 2, 4, 6 and 8 and be collected into one collector. Each header must have its own muffler. Headers, exhaust pipes and mufflers must remain totally independent and may not attach in any way. Modified cars will have the option of meeting rule number 7.12.1 through 7.12.4.
2.04 Frames
2.04.1 Factory production complete full 1960 or newer parallel American passenger car frames only. No front clip or tube type frames allowed. Frames may be cut in rear only at point not further than 36” from center or rear end housing. Frames may not be widened or narrowed and must be able to support roll cage on both sides. Must be full and complete both sides. Front cross member may be notched for radiator and/or steering clearance only. Minimum frame and body height from ground is 4”. (except front cross member and a minimum oil pan clearance of 3”.) Maximum 2 inch wide by 4-inch tall frame stiffener may be welded directly to the outside of frame rail. Height will be measured with the driver out of the car with no lifting or manipulation of the suspension allowed. The car may be measured anytime before the car enters the racing surface.
2.04.2 Tube-type upper A-frames allowed and can be moved from stock location. No coil over shocks allowed. No homemade coilovers allowed on car. No Jeep, Bronco (etc.) or 4 wheel drive frames allowed. No sports car frames allowed. No front wheel drive cars allowed.
2.04.3 Rear of frame may be altered to accept leaf or coil springs: any coil spring must be at least 4 ½ “ outside diameter. One steel spring per wheel only. No torsion bars allowed in rear. No Progressive springs allowed.
2.04.4 No hydraulic, ratchet or electric weight jacks allowed. No air shocks or air bags allowed.
2.04.5 Minimum wheelbase is 108 inches. No aluminum or fiberglass suspension or rear-end parts allowed. Stock front clips only. No titanium products, parts or components allowed anywhere on race car.
2.04.6 Cockpit steering may be altered, but must remain on left side. No center steering.
2.04.7 No aluminum suspension parts allowed, front or rear. Including but not limited to hubs, calipers, “A” frames, mounting brackets, nuts, bolts. All components of the front and rear suspension must be magnetic steel. Alum Upper control arms spacers permitted.
2.05 Bodies
2.05.1 1970 or newer American compact passenger cars only (no panel wagons or station wagons). Stock appearing front windshield and rear window support unit. May utilize a half-windshield (flat, no wings) mounted to roll cage. Must have a minimum of three windshield bars in front of driver. Cowl panel in front of driver can be no wider than cockpit and no farther back than the steering wheel.
2.05.2 Firewall and floorboards are mandatory with a minimum .125 aluminum or 16 gage steel complete floor required. Fiberglass or metal duplicates of body parts are permitted. Handmade body parts may be constructed of steel, aluminum, or fiberglass, but must be recognizable as factory production copy. All cars must be completely painted. No plastic body parts allowed. Body must be same width, front to rear, and parallel to the frame.
2.05.3 Original roofline of vehicle must be maintained. Must be steel or fiberglass full size roof. No wings, spoilers, or any other ground effects are allowed anywhere outside or inside car. No car covers or covers on suspension parts.
2.05.4 Engine compartment must remain open. No side panels. Maximum hood scoop height is 6”. Hood sides may have 4” maximum drop and must be enclosed at rear of hood. Bodies may not extend forward past back of block. No panel in front of right door to engine compartment. No inner panels. No gun drilled, tubular or hollow bolts or studs allowed anywhere on car.
2.05.5 Driver and passenger side windows on both sides of car must have at least 12” vertical opening. Left side window net mandatory see rule 8.06.1 Arm restraints recommended.
2.06 Transmission, Rear end
2.06.1 Only OEM production 3 speeds, 4 speeds, or automatic transmissions will be allowed. No “in and out” boxes, five speed or six speeds allowed. Functioning shifter must be in stock location on transmissions manufactured after 1995.
2.06.2 Transmissions must have at least one forward, one reverse, and a neutral. With motor running and car in still position, driver must be able to engage car in gear and move forward, then backward.
2.06.3 Manual gear-type transmissions must have a standard OEM case and must have a working disc-type clutch. One 1” inspection hole is required in the bell housing. An approved scatter shield is mandatory. Automatic transmissions must remain in OEM stock appearing automatic case with a functioning stock appearing pump. The original bell housing must remain. Automatic transmissions must have an approved scatter shield or blanket. May be constructed of ¼” by 3” steel, 270 degrees around flexplate or flywheel. All Automatic transmissions will be required to run a fluid filled working torque converter. Torque converter must have a minimum diameter of 11” and a maximum stall speed of 3000 RPM.
2.07 Bumpers
2.07.1 Center of top bumper bar, front and rear, must be 16 to 20 inches from ground. Steel bumpers must be used in front and rear at all times and be securely mounted with minimum of .375-inch bolts. Two-bar front bumpers must be mounted frame end-to frame end, with the bottom loop parallel to the ground. Top bar must be directly above bottom bar, a minimum 6.5-inches apart, measured center to center at front bumper, so bumper is perpendicular to ground. Must be made of minimum 1.25 inch tubing .065 wall thickness and .095 wall thickness in the rear and must be able to support car if lifted by wrecker.
2.07.2 Rear bumper, steel nerf bars and bodies must not extend beyond width of rear tires, and must not contain any sharp edges. Rear bumper may be no more than 2 inches wider than the body on each side. Rear bumper must protect fuel cell.
2.07.3 Rear bumper must resemble one of three configurations- (1) Straight bumpers can be no wider than 5 inches outside each frame rail. (2) If the bumper is wider than 5 inches outside the frame rail, it must be bent forward on the ends at a 90-degree angle. (3) A bumper constructed in loop design.
Because someone had a problem with it in the past and they wanted to regulate it for some reason.
You keep saying noone is giving factual information. I gave factual information. You're giving oppinions.
Senior Member
Joined: Mar 2006
Posts: 3,285
Likes: 0
From: Columbus, Ohio
Vehicle: 2000 tiburon
the whole thing is that noone drives an f1 car. we have hyundais that in most cases are DD cars. stop trying to compare your hyundai to an F1 car, there is NOTHING that is the same or close. other then fact we have 4 wheels and an engine.
D/S work better then stock, and seince none who has plain rotors is speaking up we can only assume that they havent noticed enough diffrence to even make a comment on this.
if what you want to hear is that all of us have D/S rotors more for looks then performance then your right, now does that make you feel better about not having them?? or do u feel better cause you called us all out on have D/S for looks??
come on man, i know you have better things to do with your time then this. this conversation has just gotten redundant.
D/S work better then stock, and seince none who has plain rotors is speaking up we can only assume that they havent noticed enough diffrence to even make a comment on this.
if what you want to hear is that all of us have D/S rotors more for looks then performance then your right, now does that make you feel better about not having them?? or do u feel better cause you called us all out on have D/S for looks??
come on man, i know you have better things to do with your time then this. this conversation has just gotten redundant.
