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Pontiac of the Month

4 bucket 67's 1967 GTO

2023 December
of the Month

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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 

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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.

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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 by Lynn5907
Cuz my English isn't the best
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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 

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