Re: What should my cylinder compression be, 1987 Merc 115?


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Posted by Bluewater on March 04, 2004 at 14:28:37:

In Reply to: Re: What should my cylinder compression be, 1987 Merc 115? posted by Land Locked on March 04, 2004 at 12:00:02:

Another thing to do is measure the psi reading dry for each cylinder and then go back thru, spray WD-40 into each cylinder and test again. The greater the delta between "dry" and "wet" test provides an overall indication of more wear to the engine. Lower the delta - lower the wear.

The key measurement is variance between cylinders. Any variance greater than 10% +/- is not good. IE: If you have 5 cylinders at 110psi and 1 at 80 - that is BAD CARMA!!!!


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