What's good compression number?

[Wallace]

Guys don't beat on me too much I did do a search and read some, but what is the compresion #'s I should be looking for while doing a compression test.
I would spend more time and I could more than likely find it but I'm kind of in a hurry.

 

[pinellas50]

Re: What's good compression number?

Mine has 150 psi on all cylinders.

 

[dgoodhue]

Re: What's good compression number?

Usually when a cylinder loses compression it will be very obvious like 60 or less.

 

[Loeryder]

Re: What's good compression number?

it fluctuates but they should all be within 7-10% of each other or else theres an issue.

If you find a bad one a leak down maybe able to narrow the search for the issue to a head gasket (water jacket to rad) or a ring (crankcase) although your initial post it sounds like the latter.

Best of luck man and bring a 12 pack so once you find the news you can begin medicating immediately.

 

[pinellas50]

Re: What's good compression number?

Usually when a cylinder loses compression it will be very obvious like 60 or less.

Spot on. The bad cylinder I had recently came up with 20 psi on it.

 

[SY2455]

Re: What's good compression number?

With 73,000 miles on mine I got 155 lb in all cylinders, but # 2 which had 160 lb. I need to do another one now that I have 93,000 miles.