NomadShark

does any1 know of a company or a product that would make a 2k1 tib 2.0l rev past 8500? safely??

Random

HELL NO!!!!!

The HLA(Hydraulic Lash Adjusters) system that our Valvetrain uses does NOT like high RPM. You would have to redo the entire head to use a completely different Valvetrain.

[ July 05, 2001: Message edited by: Random ]

NomadShark

geese ok man

Tiburon_69er

Random, if this is possible is there a car that you could get the parts off of that would fit the Tibby? IF so what kind? But what type of work are you talkin about here to get this head replacement done? Would this be worth it? If it is you could go with a better cam and higher RPM right?

Random

You would have to replace the entire top end of the head. Basically, the entire valve timing/driving system.

There are no other engines that I can think of that would work. You MIGHT be able to try the valve system off a mitsu motor, but As they use Belt Driven cams off the left side of the motor, I'm 99.9999% sure you could not adapt it to fit.

Canadian Prairie Shark

You could try and run solid lifters like the big V-8 guys run in their engines to increase rpm. You would also need stiffer springs.
I think your biggest prob would be trying to keep the pistons from changing holes or punching new ones! There is a lot of stress on the crank and con rods even at the stock red-line.

Red

You cannot run solid lifters in the stock head, period. Solid lifters work in a car without overhead cams, or in an overhead cam design that was specifically built with solid lifters(Honda/Acura heads)

The HLA assemblies in the BETA are a small shim device; approximately the diameter of a US 50 cent piece and about 3/4 of an inch thick. It's actually two seperate units (a sleeve and piston design) in which the center fills with oil, thus pushing the sleeve/piston sections apart and taking up the slack between your valve stem and the camshaft lobe. Thus, so long as you have oil pressure, you have self-adjusting valve lash.

The problems:

Micro-hydraulic devices like HLA's have a specific stress limit. The damage that high RPM's cause is exponential -- an increase from 6700 to 8500 would result in an almost double stress increase on the HLA assemblies. The end result would be destroyed HLA's after only a short amount of time at that speed.

To convert to a solid rocker design, you would require an entirely new cylinder head design that includes rocker arms. There are no rockers on an HLA system, because the camshaft directly actuates the HLA shim, which sits directly on top of the valve stem. Also with solid rockers is a need to have entirely different camshafts ground -- cam profiles are different from solid rocker designs versus direct-actuation designs.

It's too much money to deal with. These cars were not meant to be high horsepower revvers like a little Honda engine; they are meant to produce gobs of torque much more similar to a classic V8. You will not find an N/A Honda building 150+ lbs of torque to the tires, unless they're redlining at 9200+ RPM's. These cars will throw 150+ lbs of torque with some fairly basic upgrades; they are simply much different designs.

In other words, it's too much money for not enough benefit. Ignore the Honda riceboy that says RPM's make horsepower; RPM's only serve to wear piston rings and cylinder walls faster. Yay.

-Red-

NomadShark

and i thought i knew a lot about cars LOl its funny