Thread: Compression PSI
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Old 11-01-2014, 11:46 PM   #59
Tom Wesenberg
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Default Re: Compression PSI

Quote:
Originally Posted by Bearing1 View Post
what are the acceptable lower limits?
My cold engine (not running as yet) has 50psi in all 4 cylinders. reachs 50 on first rev and goes no higher. Only went 3-4 revs. Old engine with new valves and guides. Not run for 25 years. Hope to start soon as gas tank cleaned.
My 28 also has 50 on all 4 cylinders, has good power and doesn't burn oil, so I think that's fine. If all 4 are equal and the engine doesn't burn oil, I'd even settle for as low as 45 lbs. before working it over.

It does have a noise I am going to check out though, so I'll be pulling it for that reason, and use another good short block in the meantime. I think it's piston slap. but won't know for sure until I take it apart.
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