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Originally Posted by h0tr0dder_uk
I seem to be having some trouble working out compression ratios for my ZZ502 Chevy engine. I know that its 9.6:1 with 110cc heads (4.470 bore, 4.000 stroke). The HO502 uses the same psitons but a 118 cc head and has 8.75:1.
When I enter all these details into some of the online compression ratio calculators I can't get them to add up ?!?!?
The reason I am doing this is that I want to lower my compression ratio as I'm running a blower. I intend to fit a pair of 121cc cnc ported heads and want to know what CR that would give me.
Any ideas  |
As long as you run the same head gaskets as the HO502 and the pistons are in fact the same then it would be slighly less than 8.75:1. I am sure an expert will chime in.