94 mercury comp check

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scothorn

Seaman Apprentice
Joined
Sep 8, 2006
Messages
35
what would be "good" numbers, for a compression check on a 94 Mercury 225?
Thanks,
Scott
 
tashasdaddy

tashasdaddy

Honorary Moderator Emeritus
Joined
Nov 11, 2005
Messages
51,019
Re: 94 mercury comp check

Scott, it is more important that the numbers be equal within 10% more than a factor. usually want 100 psi or more.
 
S

scothorn

Seaman Apprentice
Joined
Sep 8, 2006
Messages
35
Re: 94 mercury comp check

They all were close, within 4-5 but only tested around 100 I talked to a mechanic at a shop on the phone after I posted this thread and he said anything below 105 and you would have some blow by. Any thoughts??
Much appreciated,
Scott
 
S

scothorn

Seaman Apprentice
Joined
Sep 8, 2006
Messages
35
Re: 94 mercury comp check

also, how fast should that 225 push a 20ft procraft fish and ski?? (1900lbs)
Thanks again
 
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