Alright I searched and didn't find anything like this but I've been thinking...
Has anyone ever tried to make an intake manifold that acts and looks like a equal length turbo manifold?
Call me crazy but wouldn't a intake like that give some crazy power in the upper rpm band. Of course it would still need to link up to the throttle body and there would need to be some section (I'm assuming just after the throttle body) for vacuum lines, but with the right diameter and equal length intake runners hooked up to a appropriately sized throttle body (depending on current mods) you could have a daily driver with a heavy increase in power on the upper end of the rpm band? Basically what those without the desire or money to go boosted have been looking for for years...
Just a thought...

 

manifolds like that have been thought of before...hell i think toyota has one

magnus has a typical intake manifold setup that flowed better though(if i remember correctly)

 

The idea behind the airram intake manifold has the same principle as the equal length runners design--right. The two would just go about it a little different. The airram gets smaller as the you pass each runner keeping the air pressure/flow the same. But having just runners instead of a "tank" of sorts (to pull air from individually) would allow for better flow numbers. Right??? Or am I missing something obvious?

 

All runners would suffer low end loss.... you'd essentially be running inline TBs. The plenum is a pretty important part of an intake manifold I would guess as I've never seen an intake manifold without a plenum at all.

 

Check out a Corolla 1ZZ-FE motor. No plenum. Just runners.

 

Looked up the corolla and so I started searching to see if anyone else has tried and wow...the 2004 mitsubishi galant has it or at least the concept down. I remembered I had a friend who owns a 04 galant so I got him to pop his hood and there it was. The throttle body looks restrictive as hell, but they have the right idea. Equal length runners and all. A small chamber just after the throttle body too--for vacuum lines and such I'm assuming, but I couldn't see any. But there it is--leave it up to mitsubishi....................

 

the reason turbo manifolds are equal length is because there's an equal amount of exhaust flow coming out of the engine, why? because there's an equal amount of air going into each of the cylinders. there's only one intake of air, there's four cylinders. air needs to be evenly distributed to each of those cylinders somehow. if not detonation. that's why there's a tank engineered to distribute that air into the pipes. no tank, no distribution.

if you take the stock manifold out and pour a hose through it, you'll notice that equal amounts/flow of water will stream out of each of the four pipes. spray toward the middle and it will be a steady even flow. you take a turbo manifold and you spray toward the middle the two sides will not get any flow.

 

KitCoupe--sorry but I don't think that analogy is completely accurrate if you are trying to describe airflow characteristics. In a low pressure/low volume circumstance yes you are correct. However, as air travels faster and faster, pressures will change in certain parts of the "tank" causing uneven distribution in each plenum--lowering horsepower as rpm's climb (cams, timing, and port sizes are the main reasons, but the stock tank doesn't help). This is not the case in an airram intake manifold since as you move along the manifold, the tank get smaller and smaller allowing for equal distribution of air into each plenum (each combustion chamber too).

When in low rpm's this airram intake manifold isn't as effective (lower volumes of air), but the higher the rpm's (the more air is being pulled in) the manifold becomes extremely effective (in a turbo application where air is being forced in the airram is even more effective). If there is still any doubt in you consider the quad throttle body application (where 50% gains in power in the upper rpm range are realized) where again no tank is used and if done properly no detonation.

 

Old Topic i know but i thought I'd bring this back up seeing the recent IM debates going on. Some people seem not to believe in this equal length intake runner set up and have been pointed in the direction of the 1ZZFE engine that the corolla has in it. Well aren't you all lucky that, that was my previous car...before i wrecked it...and i just happen to have a nice pic you all should see.

Now don't be like the rest of the world and say "those are some nice looking exhaust headers" cause please realize that Toyota turned the engine around in order to make use of the inertia of a the car moving forward to help with intake flow. The plenum here is simply a resonator before the runners to calm down any air pulses form the cylinders. This engine produced awesome torque curves for an engine for its size and power rating (only 125 hp) and accelerated very well. It lacked however in high rpm power.

 

^^ Well you pointing the air intake the other way didn't help with the "inertia' very much. wink1.gif

The length of the runners probably is what caused high end loss, shorter runners usually make better high-end.