Cruisers & Sailing Forums - View Single Post - How to make your Diesel last a long time.

WindDancer · 21-09-2006, 16:50

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

21-09-2006, 16:50	#3
WindDancer Registered User Join Date: Oct 2005 Location: Phoenix, AZ Boat: Lancer 36 at Mission Bay, San Diego Posts: 32	Best RPM for Yanmar 3GM30? 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