whats good compression?

[jp123]

just wanting to know if my compression is ok.. i know that if your lowest compression is 80 percent of your highest its ok to run.. cylinders 1 and 2 are 120 psi and 3 and 4 are 150. i know my tester is a little low from other things ive worked on and compared.i have 8:5:1 forged pistons.. thanks for any help

 

[habitatguy187]

120 isn't very good obviously, but I trapped 114 with all 4 cylinders around 128. I've also read lots of ppl hitting 11s with 120ish compression. But it sounds like you need to get an accurate tester and do it again.

 

[97polotalon]

Deffinitly get a good tester and retry it . 120 is low for sure.