#97820, "RE: 8.8:1 je's with Head gasket shim... mistake??" In response to In response to 19 Oct-17-06 07:08 AM by DarkOne
Originally posted by daytonturbo Obviously, it does not make the internals any stronger. What it does is lower combustion chamber temps. Heat is your piston killer wether hyper, cast, or forged. I have seen first hand in my Neon what detonation does to a Hyper piston. I melted one myself running just 8psi on my first turbo kit. Which I pieced together my self in 2000 without much outside help. Guess what, IT was too hot in the cumbustion chamber due to lack of fuel. So I used some of the technology that HKS used on the Supra and made a shim. This shim is just cheap insurance and allows for mistakes such as melted pistons that most people can't afford.
This man speaks the truth, though if you want to get technical, shims still reduce the available quench area by spacing te head further away, which can, even on some modern motors, make them more prone to detonation. 8.8:1 JE pistons are deigned to mimic the same quench area as a stock piston with lowered compression. If you want less than 8.8:1 compression, don't shim it - use the right piston. JE will make them for barely more than you'd pay for a shelf set.
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