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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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  #21  
Old 01-29-2013
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Re: Yanmar 3GM30F HP one-hour rating (??)

The sweet spot rpm setting for any particular engine installation is going to vary depending on the rest of the factors involved, i.e., displacement, prop size/pitch, etc.
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Old 01-29-2013
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Re: Yanmar 3GM30F HP one-hour rating (??)

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Originally Posted by sck5 View Post
oh and another vote for mack boring's diesel course. They ask what engine you have in your boat and then provide you with THAT SAME EXACT ENGINE to work on for the 3 day course. You will never again get such a good view of the back side of your engine
Also a tour of Mack Boring facility and as I recall they now have an Indian motorcycle dealership as well. Also you can get to get a chance to buy parts directly at their counter at prices more realistic(long story) then from your local marina...
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Re: Yanmar 3GM30F HP one-hour rating (??)

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Originally Posted by PorFin View Post
The sweet spot rpm setting for any particular engine installation is going to vary depending on the rest of the factors involved, i.e., displacement, prop size/pitch, etc.
2450 I mentioned was based on the curves data from the manual...
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Re: Yanmar 3GM30F HP one-hour rating (??)

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Originally Posted by aa3jy View Post
2450 I mentioned was based on the curves data from the manual...
Fair enough, but as the saying goes -- YMMV. The data provided in manufacturer's literature are probably based on bench testing on a dynomometer. Actual application variables are going to make those numbers more of a general guideline than steadfast rules.
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Re: Yanmar 3GM30F HP one-hour rating (??)

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Originally Posted by PorFin View Post
Fair enough, but as the saying goes -- YMMV. The data provided in manufacturer's literature are probably based on bench testing on a dynomometer. Actual application variables are going to make those numbers more of a general guideline than steadfast rules.
Exactly and thus I've gone thru 3 prop reconfiguations based on, as you called it, "general guidelines"...

There is another 'Engine Speed' that is not mentioned..but some won't really care..is the 'Max No-Load' speed. However, a good engine(separate from a boat) surveyor will/should note it on his report..
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