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Finally did a compression test...

 
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Old 05-11-2010, 08:18 PM
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Finally did a compression test...

Not happy with the results.

155/155/170/165 across the board.

Nominal/Minimum = 185/135 with no more than 28psi deviation between cylinders.

Not happy with the numbers...guess I should at least be happy that they're all close to each other....
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Old 05-11-2010, 10:16 PM
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Re: Finally did a compression test...

whats the plans, rebuild or swap?
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Old 05-11-2010, 10:48 PM
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Re: Finally did a compression test...

They're well within spec -- why aren't you happy? Even a new engine won't necessarily show 185, unless it's hand-built.
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Old 05-11-2010, 10:54 PM
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Re: Finally did a compression test...

that really isn't all that terrible. i wouldn't worry
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Old 05-11-2010, 11:15 PM
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Re: Finally did a compression test...

Well considering how religiously maintenance has been performed on the motor I guess I expected a little better. Oh well. It should last until I can actually build a new motor down the road a ways.

Edit: I guess here in a few weeks I will do another compression test after I do a valve adjustment. I'd imagine out of spec valves could have somewhat of an effect on compression numbers.
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Last edited by dbd6604; 05-11-2010 at 11:23 PM.
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Old 05-12-2010, 12:23 PM
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Re: Finally did a compression test...

those are all within spec and are strong numbers, but after a valve adjustment you may see a bit higher numbers...but i wouldn't stress it
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Old 05-12-2010, 04:30 PM
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Re: Finally did a compression test...

I'm gonna do a wet test today to see how bad the rings are. I'll keep you guys updated lol
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Old 05-12-2010, 05:51 PM
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Re: Finally did a compression test...

Well.... my uncle (Chevy tech) insists that I did my compression test wrong because I did it on a cold motor. My grandpa insists I did it correctly. Who's right? I didn't even think about this til they brought it up. lol
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Old 05-12-2010, 06:05 PM
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Re: Finally did a compression test...

help me fix it


thats my theory/reasoning why it should be done on a cold motor. still waiting for his response on why he thinks it should be warm.
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Old 05-12-2010, 06:42 PM
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Re: Finally did a compression test...

Alright. I guess 155-170 ain't bad on a cold motor then.
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