Why has nobody mentioned that using the thicker head gasket will make less power at 9:1 than a stock headgasket and 9:1 pistons. It will also be more prone to detonation than the stock headgasket and 9:1 pistons. The quench will be much better with the stock headgasket, etc... The thicker headgasket is a bad idea in general, and is only used if you have no other option when compared to a motor built for the right compression.

9-9.5 to 1 would be perfect and should give a lot of trouble free miles at 12psi and leave you with some amount of headroom for slightly off tunes, etc...

FYI this is what I building the racecar to be. (9:1 and 12psi max). This isn't a bad combination at all. A lot of factory turbos are 9:1 and about that boost.

Bill

 

I have to agree, I do not like the idea of running 3mm worth of gasket. Low compression pistons would be the correct way to do things.

 

Tell that to Mase. I believe he had a stock compression S2k (completely stock engine aside from fuel management and EMS) at 22psi for a few runs... I believe they had it regularly at 15psi. It is all in the tune.

As far as power drop off-boost, YES, you will feel it with 9:1 CR.

What sleeves are you going with? I hope not the stock FRM, as your piston selection will be greatly limited...

I believe you can get CP pistons in whatever CR you want from Laskey Racing... Note the "Honda Custom bore and compression ratios" category.

http://www.laskeyracing.com/shop/cppistons.htm

John

 

I love this forum, and the people who contribute to it.

My set of JE 9:1's will be here this week. I am trying to get in contact with a member on here who offered to sell me a set of JE 9.8:1's, but if that falls through, I'll go with the 9:1's.

 

Ductile iron sleeves. Benson I believe.