it varies with different gauges, adaptor, battery(some people hold charge while doing cranking for all four cylinder),etc


it's not how high the number but how little the number varies that indicats a problem.

and make sure you do all 4 cylinder with the same number of crank, repeat the testing process at least 3-4 time just to get a constant result.


plus you always gets a slightly lower number on brand new car, the number is higher when it's break it. the number could even higher when you get carbon deposite in the piston, etc.

 

cam specs, static and dynamic compression, all play a role in compression numbers. While an S2000 may have 240psi/cyl, a stock 5.0 mustang will only have 150-170 psi/cyl and both cars be in optimum condition.

 

I did mine while it was hot, I didn't disable to fuel pump though. I will check it again soon and hopefully those numbers will be a bit better. Thx everyone.

 

LOL Idk how to QUOTE But N/A power thatnks for the tip I didn't think of that when I wrote that.

But also for example lets assume an s2000 should be well over 220 respectively. I know the variations between each cylinder is what you guide yourself on. But lets say you get 195 across the board. You got consistency but you have low numbers. I mean I would say somethings wrong....

Correct me if I'm wrong.

Also u cant compare my sohc to a f22 or f20 i understand and agree with you... but if for the sohc the highest is 220 (or a lil les) and im putting down 210 across then damn the motor is fine I would say..

But now you got the s2 with 195 or w/e then Im going to question myself on damn is this motor dying???? I dont know if im expressing myself right.....

 

I understand were you are going with that iluvs2ks. I am a bit nervous about my numbers and I will check again here VERY soon. The car is just sitting right now so I am not in a rush to do this. Also I am in the middle of adjusting the valves right now.

 

Well I wish you the best of luck and we'll hopefully hear from you soon. im new to this forum but i like the way ppl actually pay attention to others..... good luck once again

 

IMHO Your compression numbers look good for that mileage.