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Old 01-04-2006, 01:54 PM   #1
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compression

mate of mine is going to look at fletcher with 75hp merc 1991 bloke says engine has had rebuild a year ago so going to do compression test but what should the compression be
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Old 01-04-2006, 02:44 PM   #2
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Dunno what they should be but just make sure they are all within 5% of each other
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Old 01-04-2006, 11:17 PM   #3
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Dunno either but I'd be expecting 110-120psi.
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Old 02-04-2006, 04:58 PM   #4
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When I measured mine (1992 Merc 75) about 18 months ago I got: 9.2 Bar, 9.4 Bar, 9.4 Bar (about 135 psi).

I asked a similar question; these are the answers I got: http://www.boatmad.com/forum/showthr...&threadid=1598
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Old 02-04-2006, 06:27 PM   #5
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cheers
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Old 03-04-2006, 03:15 AM   #6
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Do a leakdown test - much more accurate. If you are not sure what it is, do you know a piston aircraft mechanic? He'll certainly know and probably has the tools to do it.
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