R56 Cooper compression test help - MINI Cooper Forum

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post #1 of 2 (permalink) Old Jun 18th, 2014, 10:59 PM Thread Starter
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R56 Cooper compression test help

Hi guys still having the idle/misfire problem on the cooper tried everything,Still thinking a block / cylinder head problem or head gasket i tested the compression again today plugs removed and dry and got totally different readings from the last test..... possible as my mates guage is old i used a newish one this time around.......looks very odd....seems way too high and a differential between 2+4 any ideas anyone

CYL 1-205
CYL 2-218
CYL 3-205
CYL 4-225





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post #2 of 2 (permalink) Old Jun 19th, 2014, 09:42 AM
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There's normally a 10% difference which is acceptable.
Did you use a screw-in type of tester? From the picture it looks like a push-fit type which isn't so effective. I used to warm up the engine before taking readings and keep the throttle open.
If there's a wide discrepancy in readings,then squirt some light oil into the plug hole. If compression improves,then it indicates a piston problem. If no difference,then it could be a valve problem. The Haynes manual quotes 8-12 bar with 3 bar maximum difference between cylinders.

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