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What Compression Ratio?


mck08

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Hey guys,

I have an 08 Shee - fairly stock (FMF Fattys, +4 timing, K&N, 310 mains and run on 98 octane pump gas) and as we know the factory comp. ratio is 6.5 : 1. I am planning to weld and machine the stock head and want to know what compression ratio I can go to, or finished head cc's, and still run my pump gas.

What's with 6.5 : 1 anyway - that's gay!!

Any help would be great.

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with the effort of welding/ machining, your better off just getting a cool head. Id take advantage of the dollar and buy one from one of the site sponsors.

That way you have a head that has better cooling characteristics and interchangeable domes.

 

i havent worked out the proper C/R with the smaller domes, so i cant tell you what that is, but with 20cc domes @ 165+psi with +4 adv you would be getting very close to the 98 limits. (94oct U.S )

Edited by dirtydownunder
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