Compression Test How-To
#34
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140, 130, 130 and 135. It's ok cause I'm planning on building the motor. I just needed to know why I couldn't push more than 26psi on a aka green. No boost leaks as well for max psi.
#40
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BUMP FROM THE DEaD...
DID ONE A FEW MONTHS BACK...
EVO IX STOCK BLOCK AND HEAD WITH COSSIE M2'S... 225-220 ACROSS THE BOARD... HMMM
Seems kinda high
DID ONE A FEW MONTHS BACK...
EVO IX STOCK BLOCK AND HEAD WITH COSSIE M2'S... 225-220 ACROSS THE BOARD... HMMM
Seems kinda high
#41
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another bump from the dead. Can this be done with the engine fully cooled down. I'm in the process of removing the radiator but I want to do a compression test to make sure the headgasket isn't dead. Any help appreciated.I tried it without the radiator hooked up and the first two cylinders read 0..I haven't tested the others yet. Hopefully I'm doing something wrong.
Last edited by evoracing; Sep 11, 2010 at 02:35 PM.
#42
Just want to add this for people who have IXs, the above values are for VIIIs ONLY!
I did a compression test today on my IX and my heart sank because I got 140-150-150-140...until I did some searching. Apparently on the IXs the compression thresholds are waaaaay different.
The standard is 145
The minimum is 92 (you read that right, 92!)
Please add this to the OP if possible, it'll probably save a lot of IX guys a heart attack.
I did a compression test today on my IX and my heart sank because I got 140-150-150-140...until I did some searching. Apparently on the IXs the compression thresholds are waaaaay different.
The standard is 145
The minimum is 92 (you read that right, 92!)
Please add this to the OP if possible, it'll probably save a lot of IX guys a heart attack.
#45
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Stock 2005 Evo VIII, 67000 miles, while idling, the cylinder pressure is 110 psi in two cylinders, 108 in the other two. Runs fine, doesn't smoke, doesn't use oil. Is this normal for an idling motor? I don't have the opportunity to go back and do it the suggested way.