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Old 11-16-2001, 11:06 PM   #1
mikesoob7
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Default Engine Power - Compression?

Hi,

I've got 175K on my subie, I expect there to be a bit of power loss at that mileage but just would like to know if a compression test is a fairly accurate measure of the origional performance. I am not able to do a leak-down test and I realize this is part of the diagnostics. I just want to know if compression is a fairly accurate measure of engine performance.

Mike
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Old 11-16-2001, 11:36 PM   #2
yamarocket630
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Default

it's somewhat usefull if compared cylinder to cylinder. You don't want more than 10% difference maximum variation from highest to lowest. For example if your highest cyl is 150psi, lowest should be no less than 135 psi. (don't take these numbers seriously, I just picked some out of my head that were easy to use). However, if all cylinders measure 10 psi, thats bad (low compression) even though they are all even. A leak down test is better. If you know how much compression your engine made when new or fairly new, you can compare that to now, and see how much you have lost.
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