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Old 07-13-2009, 07:34 PM   #1
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Default cold engine compression test vs hot engine compression test

is there a difference in psi results. cause my car been sitting in the garage for 3 weeks and i did a compression test and it was average 60 psi. is that bad or does it vary with engine temp?
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Old 07-13-2009, 07:57 PM   #2
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Default Re: cold engine compression test vs hot engine compression test

You have to have the motor at running temp. Doing it on a cold motor is pointless since it doesn't tell you anything. 60psi would mean the motor was done if it was fully heated up. Drive for a few minutes til it's up to temp and do it again
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Old 07-13-2009, 08:26 PM   #3
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Default Re: cold engine compression test vs hot engine compression test

because my car wont start, and i was doing it at a cold temp. so low compression would be low if its a cold engine?
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Old 07-13-2009, 08:30 PM   #4
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Default Re: cold engine compression test vs hot engine compression test

i do my compression test with a cold engine
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Old 07-13-2009, 09:31 PM   #5
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Default Re: cold engine compression test vs hot engine compression test

You will get different readings for warm and cold engines, but 60 psi is pretty low in either case.

Are you testing with an open throttle?

Last edited by ddd4114; 07-13-2009 at 09:41 PM. Reason: spelling
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Old 07-13-2009, 10:52 PM   #6
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Default Re: cold engine compression test vs hot engine compression test

Quote:
Originally Posted by ddd4114 View Post
You will get different readings for warm and cold engines, but 60 psi is pretty low in either case.

Are you testing with an open throttle?
no throttle just cranking
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Old 07-14-2009, 04:29 AM   #7
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Default Re: cold engine compression test vs hot engine compression test

Quote:
Originally Posted by skaternak View Post
no throttle just cranking
Test it again with the throttle open.
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Old 07-14-2009, 06:21 AM   #8
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Default Re: cold engine compression test vs hot engine compression test

Compression test is done on a hot engine. This way all the parts expand on heat and keep a better compression.
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Old 08-09-2009, 06:33 PM   #9
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Default Re: cold engine compression test vs hot engine compression test

I understand that the compression test is better done with the engine hot but if your engine isn't starting how do you do that? I just did a test because I think my headgasket is blown. I'm getting 105psi in each cylinder and the minimum is 135. I would have thought at even at 105 it would at least start. Also, it seems odd that I have low compression in each cylinder. Any thoughts?
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Old 08-09-2009, 06:38 PM   #10
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Default Re: cold engine compression test vs hot engine compression test

If you ran the test with an open throttle, 105 psi is pretty low, even for a cold engine. However, it should still be able to start, even though it'll run like poop.

Sounds like trouble
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Old 08-09-2009, 06:48 PM   #11
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Default Re: cold engine compression test vs hot engine compression test

Quote:
Originally Posted by Ruben19 View Post
i do my compression test with a cold engine
X2 and 1st time I did a motor I didnt hold it WOT and i was like **** i need a rebuild. i was pissed and walked away for a second to get a drink and ran back out dugh it has to be WOT and then it was in spec.
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