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Registered
Join Date: Oct 2004
Location: Sweden
Posts: 3
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Compression numbers #
I just did a compression check on my 911 2.7 L -1975 with 50 000 Km since Top End Rebuild. Can anyone tell me what a normal compression reading would be.
Here are my results cyl# - compression (psi) 1 - 157 2 - 158 3 - 148 4 - 158 5 - 150 6 - 140 Thanks,
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911T -71 with 911- 75 engine |
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10-05-2004, 12:50 AM
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Friend of Warren
Join Date: Oct 2000
Location: Lincoln, NE
Posts: 16,493
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There really is no "normal" what you are looking for is no more than a 10% deviation between the cylinders. Was the engine warm with the throttle open? If not retest. If so I would investigate why cylinder 6 is reading low. Maybe just piece of carbon caught in the valve or need a valve adjustment. Check and retest.
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Kurt V No more Porsches, but a revolving number of motorcycles. |
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10-05-2004, 05:19 AM
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