Quote Originally Posted by GM_TUNER
Lets add into the equation, the fact that ill be boosting on a milled head, taken down .020" with forged internals. That gives me a 10.6:1 Static CR. Then, with 12psi, it gave me 18:1 Effective CR.
Don't forget, compression ratio is a physical measurement of a piston at bottom dead center versus top dead center. Example, a cylinder w/ 500cc volume at BDC and 50cc at TDC has a compression ratio of 10:1. Boost changes overall pressure, but not compression ratio.