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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Old 05-05-2014
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Need Yanmar 3JH3E fuel consumption datasheet

Does anyone have an old technical datasheet for a Yanmar 3JH3E engine that has the graph showing fuel consumption at different RPM? I figured consumption for my engine at 2,500 RPM by filling the tank, motoring at 2,500 RPM for a few days, and refilling the tank to see how much it took, but I can't do that at every possible RPM.

Yanmar's web site only has datasheets for current model engines, and the only place I can seem to find these datasheets online is on BoatDiesel.com, and they want me to pay $25 to read a datasheet that Yanmar used to hand out by the thousands for free at boat shows. I can't bring myself to pay it.

Thanks!
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Old 05-09-2014
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Re: Need Yanmar 3JH3E fuel consumption datasheet

It really doesn't matter.

Really.

Over the course of operations, you'll run your engine at vastly different rpms.

ALL you NEED to know is the average fuel consumption, and what you did by running around and refilling is exactly how to do it.

Fuel Log
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Old 05-11-2014
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Re: Need Yanmar 3JH3E fuel consumption datasheet

Quote:
Originally Posted by Stu Jackson View Post
It really doesn't matter.

Really.

Over the course of operations, you'll run your engine at vastly different rpms.

ALL you NEED to know is the average fuel consumption, and what you did by running around and refilling is exactly how to do it.

Fuel Log
With all due respect to Mr. Jackson,
Average consumption is a nice to know; but what you really NEED to know is, in a pinch, what "performance" can I get per hour at the low end (max endurance/range) or, if I need to run fast for weather/tide/daylight/injury, do I have the fuel to do that. For instance, how fast can I make a Closest Point of Approach" to get/give help. I may need to adjust my plan if the fuel available prevents me from fighting a foul tide to make my destination. At what throttle setting do I get my "hull speed" and in what sea state does adding throttle just waste fuel for no incremental gain.

If you don't buy the safety aspect, think about a plan to buy fuel in the least expensive places by giving up half a knot (500RPM) to get there with some reserve.
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