Thread: Compression Test

As long as they all around around 10-20psi within each other it is supposed to be in great running shape IMO. Seafoam it...then test it again and see if it becomes even more consistant of a psi.

well, 10% of 150 is 15...so that would give you a lee-way of 135-150, so you are like what? 2% ish difference on 2 pistons...like I said, seafoam it and it should all be good to go

You don't mention if this is with the throttle blocked open, all plugs out and whether you added a little oil for the wet check as well.

There are sometimes many factors that can affect a compression test. Overall your results look good though. Maybe retest those lower cylinders and see if you get a slightly different number.

yes those are some good points............what is the proper procedure for doing a compression test? Or is there a thread out there already that I missed?

Originally Posted by Liquifire

yes those are some good points............what is the proper procedure for doing a compression test? Or is there a thread out there already that I missed?

I'm curious too. I think i've done it one plug at a time, I can't remember though......

right.......it is one plug at a time......but are the other plugs all in? anything special done with the intake region? Etc......????