![]() I am going to make some comments about compression related to Johnson and Evinrude motors, because am more familiar with motors from the 1950’s to mid 1980’s motors. ![]() Also using compression numbers from new to late model outboards and comparing them to older outboards is not justifiable. ![]() Higher hp motors will have and require higher compression psi numbers compared to lower hp outboards. It is my understanding that Mercury motors have always been high compression motors.Īlso, you can not use the same values of compression when talking about higher hp motors compared to lower hp motors. I am a Johnnyrude guy, so I don’t have much experience with Mercury motors. That is like comparing apples to oranges, yes they are both fruit but they are different!! Well, comparing Mercury motor compression values to Evinrude/Johnson motor compression values is not comparable.
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June 2023
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