Compression on Evinrude


Old 04-01-04, 07:23 PM
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Compression on Evinrude

I am going to look at a boat that has a 1967 100hp Evinrude and thought that I would check the compression. I would like to know what the psi should be. Is there any thing good or bad about this particular engine? It is suppose to run exelent but won't be able to run it until I buy it.
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Old 04-04-04, 06:00 AM
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Hello: Cobblemaster

Generally speaking, if the engine runs well, the engine is good and in my opinion, not any better or worse than any other based on it's age.

Engine compression same as any other engine. Should be not less than 100-120 psi per cyclinder. Can be less if engine more worn.

Run the test with all spark plugs out, the throttle wide open. Only one compression hit indicates true compression for that cyclinder. All cyclinders should be near or close in compression results.

If seller not willing to take you out for a test run, use caution. Compression test may return good results but does nothing if boat has other faults or sinks...LOL!

Distraction with engine condition, etc may divert attention from other possible faults or unseen potential problems, etc.

Depending upon boat age, size, costs, etc not mentioned, if conditions warrant, hiring a private boat assessor may be worth the costs.

Regards, Good Luck & Safe Boating.
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