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post #5 of Old 10-14-2010
Maine Sail
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From Yanmar

"For prolonged running, a pleasure boat engine a good operating speed is around 85% of maximum continuous rated RPM (see the engine data plate)
assuming the propeller size is correct and the engine can reach maximum rpm).

Operating for extended periods below 80% rpm may increase longevity but the cylinder bores could glaze causing an increase in oil consumption and blue smoke especially when new."

Max continuous RPM on the 3YM-30 is 3489
Max No Load Engine RPM is 3600

85% of 3489 puts your cruise RPM at 2965 RPM or just about 3000

-Maine Sail / CS-36T

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Last edited by Maine Sail; 10-14-2010 at 08:08 AM.
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