Compression test

[Lynn5907]

So I finally got around to doing a compression test. Did them cold and hot as well as throttle open and closed. The results are cylinder 1 .. 160 , 2 .. 165 , 3 .. 165 , 4 .. 165 .. seems good to me of course this is just the top of the motor. Oil pressure test next. Also seen no reason to do a wet compression test .. sorry I haven't been on here in a wile broke my phone. 2000 grand am 2.4 l ...... 272,547 miles 

[Frosty]

Off the cuff, those numbers don't sound too bad. no huge deviation between cylinders. It would appear that there is no obvious blow by.

[TWO LANE BLACK TOP]

Also shows that the valves are sealing good too....

[Lynn5907]

What's up you all. Yea no obvious blow by, like maybe a little steam by removing the 710 cap, but that's more than likely hot oil. The only real reason I was doing this is it still has a random miss at random times .. mainly at idle and I seen smoke one night. Someone peed me off and rode my butt like a whore in church so I floored it she when to 5800 rpm and there was some type of something that came out the back to be fair it was a fair amount. Not at all sure. When I did the compression test I only did four puffs no more or less. So the compression is really like 170 or 180 if you let it go 6 or 8 strokes. I don't know the max psi there. I'll deffo be gitten back to do a re-re-re-test. 

 

What would you say max psi should be, I know deffo no more than 200 psi 

 

Do you think I should re-re-re-test it????

Edited April 5, 2019 by Lynn5907
Cuz my English isn't the best

[Lynn5907]

Ok well re did test to see max pressure.. after 7 or 8 puffs it came out to 180, 185, 185, 185... and it stayed there even if you did ten puffs