My manual for my Yanmar 3GM30F states that the max continuous rpm is 3400. Max intermittant is 3600 rpm. I'll have to go back to the manual to make sure, but if I remember right, intermittant means no more than an hour or so at max intermittant. The manual also states not to run the engine for long periods under 80% throttle (or power? I don't remember). If you are going to run under 80% throttle an extended time, rev the engine to higher rpms every hour or so. I believe the manual says to operate it this way to not accumulate carbon in the engine and to not glaze the cylinder walls. I've been running mine at minimum 2900 rpm for cruising speed.
John
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Originally Posted by WindDancer I have a Yanmar 3GM30, the nameplate on engine says "RPM 3400". Is this the red line?
I usually run engine around 2200-2500 RPM which moves the boat at about 5.5-6+ knots. If I push it to 3000+, I can make 7 knots, but with a lot of noise and churning of water aft of transom like it might be cavitating.
Is 2200 RPM too low? I even run it at 1800 when channel rules limit speed to 5.
TIA
Forrest |