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Compression Test Results (comments needed)
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Posted by Roger (NAWC) [Email] (more from Roger (NAWC)) on Fri, 11 Jan 2002 15:01:19 Share Post by Email
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1986 900T, 200k miles. During the last drive, the turbo would boost just slightly to the red, but the acceleration wasn't quite what it should be, with that kind of boost. So, I decided to check the compression (dry, and also wet, with 3cc of oil squirted into the cylinder). The results are:

Cyl. 1: 165 dry / 185 wet
cyl. 2: 150 dry / 170 wet
cyl. 3: 160 dry / 175 wet
cyl. 4: 145 dry / 210 wet

Cylinder #4 bothered me, so I started the car and let it run for a minute or two (it had been sitting for a week prior to the test). I then retested the compression, and got:

Cyl. 1: 165 dry / 185 wet
cyl. 2: 155 dry / 170 wet
cyl. 3: 165 dry / 180 wet
cyl. 4: 170 dry / 180 wet

Had this been the original results, I'd be happy (except cylinder 2 is kind of low). My question is, do I need to worry about cylinder 4? Are these numbers ok, overall?

TIA
Roger




posted by 151.200.4...

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