What is the Maximum Effective Compression Ratio, for B18A motor??

[teh_mugen18]

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.

[Vteckidd]

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.

dont mill your head, kind of pointless.

But if you do, it only changes your compression maybe .3 at the most. So you may go from 9.5 to 9.7is

not that big of a deal

[RWD164]

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.