Compression ???? 91 SC Auto

SuperCoupe007

Registered User
Me and my friend wanna do a compression test on a 91 SC - automatic. The engine is said to be stock. Never been overhauled or anything like that. What should be the normal compresson pressure ? What would be the lowest compression acceptible and the highest ???
Thanks guys...
 
I've got a practically worthless haynes manual and it says 101psi minimum. personally I don't like to see less than 120psi and not more than a 10psi deviation between cylinders. I tested mine and it ranged from 148-155psi at room temperature. If that helps. It should be done at close to normal operating temperature though but it's a little tigh under the hood if you know what i mean. I didn't want to burn the hell out of myself.
 
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