As far as I can find, thanks to the Brochures scanned at Gold Coast Power...
Continuous rating for 3QM30F: 2600RPM
Is this correct for the 3QM as well? Hopefully I can find the engine manual in the nav. table...
What is official 3QM cont. operating RPM?
- Thread starter coleman
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I think the max rating on the QM is 3200 and the normal cruising RPM would be about 85% of this rating. Check out Yanmar Help.
http://www.yanmarhelp.com/index.htm
http://www.yanmarhelp.com/index.htm
Proper RPM
I have a Yanmar booklette that provides the proper rpm for both the 33hp and 30 hp versions. The 30 hp has a max rpm of 3000 rpm, were the 33 goes to 3200 rpm. Cruising at 2600 rpm. It also gave a performance curve graph to show fuel consumption. By lowering your rpm from 2600 to 2450, you are giving up 2 hp, but gaining almost 1/2 liter of fuel per hour. Drop to 2200 rpm, gain another 1/2 liter of fuel per hour. The propellor power curve has an even sharper of a drop than the horsepower, so you can easily increase the engine rpm under load, just as you can save fuel by lowering your rpm while running with the current. I have thought about changing my prop pitch to save fuel, until i tried to go upstream where a river opened into a lake, and the current was 6 knots. Now I am saving up for an adjustable variable pitch prop to match the currents I will encounter. I hope this will help. TC
I have a Yanmar booklette that provides the proper rpm for both the 33hp and 30 hp versions. The 30 hp has a max rpm of 3000 rpm, were the 33 goes to 3200 rpm. Cruising at 2600 rpm. It also gave a performance curve graph to show fuel consumption. By lowering your rpm from 2600 to 2450, you are giving up 2 hp, but gaining almost 1/2 liter of fuel per hour. Drop to 2200 rpm, gain another 1/2 liter of fuel per hour. The propellor power curve has an even sharper of a drop than the horsepower, so you can easily increase the engine rpm under load, just as you can save fuel by lowering your rpm while running with the current. I have thought about changing my prop pitch to save fuel, until i tried to go upstream where a river opened into a lake, and the current was 6 knots. Now I am saving up for an adjustable variable pitch prop to match the currents I will encounter. I hope this will help. TC
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