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Old 08-22-2001, 02:42 PM   #1
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What is normal cylinder psi?

Recently I posted questions about oil comming out by breather valve and onto my valve covers. I can feel air comming out the pvc hole when i dissconnect it and i step up the rpms. I did a compression check and i am at a steady 170 psi. What is normal psi for our cars? My car is a 91 Z 28 with a 350. Any help would be GREATLY APPRICIATED Click the image to open in full size.
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Old 08-22-2001, 03:41 PM   #2
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There is no real "normal". There are alot of factors that affect what the gauge will show. Just about anything from 150 to 180 is "noraml". As long as all cylinders are within 5% or so of each other, then the motor is probably healthy. Consistency is more important than the absolute value.

I'd say if you got 8 readings all between 165 and 175, your engine is probably in decent shape. If you had 7 cylinders at 165 and one at 175, that might indicate a bad cam lobe; 7 at 175 and one at 165 might show a leaky valve or set of rings; 6 at 175 and 2 right next to each other at 100 might indicate a bad head gasket, etc.

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Old 08-22-2001, 04:32 PM   #3
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like rb said 140 to 180 is about right, the big thing is that the numbers are within 10%

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Old 08-22-2001, 05:27 PM   #4
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I have a lot of work a head of me!!!! Click the image to open in full size. Click the image to open in full size. becuse one cylinder is reading only 120 psi where as the others are at 170psi. I put 5cc's of oil in the lower psi cylinder and it increased up to 155psi....need an overhaul so i gotta tell the wife Click the image to open in full size. Anyhow, i guess i'll be needing some suggestions for the rebuild. Thank you all for the help!
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Old 08-22-2001, 11:43 PM   #5
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So what does it mean when u have 1 cylinder at 120 and the rest are at 175 or if u have two low pressure cylinders next to one another while the other cylinders pressures are high
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Old 08-22-2001, 11:47 PM   #6
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Never mind, didn't see your last post.

[This message has been edited by 8Mike9 (edited August 22, 2001).]
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Old 08-22-2001, 11:47 PM
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