i just got my engine compression tested and it came to 150-150-150-150, but how do i convert this into a compression ratio? my stock spec is 10.4:1, and i'm wondering how far off this ten year old engine actually is. if anybody knows how to convert this sort of thing, your input would be appreciated greatly

 

like 8:6:1 theres a ratio in a thread i just saw...

got it...
8:1-8.5:1 c/r = 150-170 psi per cylinder 8.5:1-9.5:1 c/r = 170-210 psi per cylinder
9.5:1-11:1 c/r = 210-275 psi per cylinder 11:1+ c/r = 250+ per cylinder