Mercury 500HP Cranking Compression

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03-02-2010, 05:20 PM

OUTLAW24

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Mercury 500HP Cranking Compression

Has anyone completed a compression test on a healthy Mercury 500HP (Carb) engine? If so what is the average. Thanks in advance!

03-02-2010, 06:29 PM

rssteiny

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Best to do a leak down.

03-03-2010, 12:18 AM

Griff

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Good cranking compression is around 150-160lbs. It will give you some indications. If you are checking the health of an engine, a leak down is definately better and will help you narrow down any issues.

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