compression in cylinder

[skoman]

I have a 1978 55hp evinrude and would like to check the compression but do not know what it should be in both cylinders. I know that it should be close to one another but have heard varying numbers from 80 to 110 .

 

[voodoo]

Re: compression in cylinder

seems here everyone likes around 100psi but more important no more than 10% apart

 

[skoman]

Re: compression in cylinder

thanks for the tip voodoo will check this weekend

 

[Dhadley]

Re: compression in cylinder

The manufacturer calls for a variance of no more than 15 lbs (not %). We're not so worried about the actual number as we are the difference.

 

[skoman]

Re: compression in cylinder

thanks for info dhadley so no more than 15lbs differencebetween the two cylinders.

 

[Dhadley]

Re: compression in cylinder

Thats corect. Let us know what you find.<br /><br />Good luck!