Thread subject: Whaler Central - Boston Whaler Boat Information and Photos :: 1968 13 whaler - 45 hp mariner compression question
Posted by jhuchingson on 08/02/13 - 9:58 AM
#1
I just bought my first whaler - its in nice condition....just hasn't been used in almost 2 years! It has a 1987 45hp 2 stroke Mariner 4 cylinder. The mechanic is going through it now fixing, replacing & tuning. Compression was 100,110,100,110 - good relative range but not super high absolute numbers. THose numbers ok? close range more important than absolute numbers? - just curious for any commentary or thoughts - would I even know the difference if it were closer to 120 etc.?
Posted by Slickityd16t on 08/02/13 - 10:18 AM
#2
As long all the cylinder's are within 10% of each other it's good.
Posted by CES on 08/02/13 - 12:05 PM
#3
Slickityd16t wrote:
As long all the cylinder's are within 10% of each other it's good.
Bam!!! Nailed it.
Posted by MG56 on 08/02/13 - 12:15 PM
#4
Well, if the engine has been sitting your rings could be a little stuck, and that could account for what I think are low numbers.
And they really made a 4 cylinder 45hp engine?
Posted by jhuchingson on 08/02/13 - 12:29 PM
#5
and yeah they did - 4 cylinders