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Hand turned compression test

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Old 12-02-2010, 04:30 PM
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Hand turned compression test

I just got the timing chain on the sprocket and i was hand spinning the crank around to see how the compression is looking and these are my results:

1- 30psi
2- 60psi
3- 60psi
4- 30psi

Why are the 1st and 4th cylinders showing such a low reading? would bent valves cause that?


UPDATE:

I put air into the cylinders and the exhaust valves on cylinder 1 and 4 are leaking, what a shame, head is coming off now :/

Last edited by grimmsly; 12-02-2010 at 06:01 PM.
Old 12-02-2010, 04:57 PM
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hand turned? search compression test and follow the proper procedure.
Old 12-02-2010, 05:10 PM
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Old 12-03-2010, 05:32 AM
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Originally Posted by grimmsly
UPDATE:

I put air into the cylinders and the exhaust valves on cylinder 1 and 4 are leaking, what a shame, head is coming off now :/
If the valves aren't closed they will leak.
Did you do the leak down on each cylinder when they were on the compression stroke?
Old 12-03-2010, 08:10 AM
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your going to have some leakage even on a good head. Thats why you use a calibrated tester( leak down/) and specific methods for testing.
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