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low compression? [Archive] - StangBangerz Forums
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capri5.0
05-20-2008, 09:41 PM
i have 69 351 w only has about 135 psi on compression test . does this seem low?
kennebellcobra
05-20-2008, 10:11 PM
I have less than that on my motor...I would check all the cylinders and see if they are with in about 10% of each other...alot of things will affect CR like cams and how they are installed. You could do a leak down test to see what kind of shape the motor really is in.
capri5.0
05-20-2008, 10:17 PM
there is no more than 5 psi variance between cylinders. dont know what cam i just got the car 2 weeks ago.the previous owner doesnt know about the engine either.
todd86
05-20-2008, 11:07 PM
I have less than that on my motor...I would check all the cylinders and see if they are with in about 10% of each other...alot of things will affect CR like cams and how they are installed. You could do a leak down test to see what kind of shape the motor really is in.

Ditto. 100 lbs and up is ok as long as they are within 10% of each other
kristen1985
06-03-2008, 03:10 PM
135 is healthy as long as they are all close to each other