Mercury 1150 Compression Question...

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Wolftnn

Cadet
Joined
Mar 13, 2011
Messages
9
After running a Compression test on my 1977 1150 and found that cyl #2-6 are all between 135-140 but cyl #1 is at 122. I was wondering if this is acceptable or is this an issue that should be resolved immediately? If it does need to be fix how difficult is this project? Any help would be greatly appreciated...
 
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Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,149
Re: Mercury 1150 Compression Question...

You have a 35 year old motor. That compression is fine, IMHO....
 
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wired247

Lieutenant Commander
Joined
Oct 8, 2011
Messages
1,557
Re: Mercury 1150 Compression Question...

Its not perfect but its OK. Tearing it down opens up a whole can of worms not to mention opening up your wallet to gain 10% more cranking compression on one cylinder which translates to 1/2 HP on a good day. There is not a linear relationship between cranking compression and engine output.
 
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