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Ayr Queensland Australia 4807 | Do the manufactures publish the ounces of fuel used per horsepower or if there is a web site. example a 6 lt engine producing 250 hp and for example a 12 lt engine producing the same 250 hp in theory the 6 lt should have less internal friction so would use less fuel or am i thinking wrong. I know there is no substute for cubes in durability however where does the line cross. Has anyone one seen and spec of fuel usage of Cummins and Deere. TIA |
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Winkler, Manitoba Canada | Nebraska tests have fuel use information.
http://tractortestlab.unl.edu/testreports
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Sac & Story county IA | In WW2 bombers, they figured a half pound of fuel will give a horsepower for an hour. It is somewhat of a guide. |
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South Central Illinois | TractorData shows the specs on most all tractors. It has the engine size, not sure if it has fuel usage. |
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Franklinton, LA | A prior poster mentioned that the Nebraska Tractor Test reports provide data on HP hours per gallon of fuel. The data on engine fuel usage at 25 - 75% of maximum power should be what you are looking for. |
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ecmn | ,
Edited by easymoney 5/16/2016 09:37
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New Brunswick, Canada | Yes there are fuel use maps published for engines at various loads. They look like topo maps or a series of separate charts. A good full load performance doesn't mean good part load.
Example of a 5.9 cummins:
http://ecomodder.com/wiki/images/e/ef/Cummins_5.9L_ISB-235_BSFC.gif
Edited by slowzuki 5/16/2016 09:54
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The Internet | KelB - 5/16/2016 13:35 I know there is no substute for cubes in durability however where does the line cross. I'm not sure about that. The engine will be designed for a certain duty cycle and life expectancy and within reason, I can't see why the displacement would have much effect on the life of the engine. Deere sold 2 versions of the 7820. The NA model had the 8.1, the model that crossed the Atlantic for Europe had the 6.8. The 6.8 had slightly more power, slightly more torque at slightly lower revs and slightly better specific fuel consumption. Aside from all that the bigger engine was better, or something. |
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Camp Douglas Wi. 40miles nw of wi. dells | We have 3 - 6.8 engines and 5 - 8.1 engines on the farm, no way will any of our 6.8s out power or out torque our 8.1s. Now maybe the 7820 that had both engines was set different. Dan
edit= 8.1 does burn more fuel, but gets more done.
Edited by DB Tracks 5/16/2016 15:31
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| Theoreticly, if two engines are doing the same work, the bigger displacement engine I would think would last longer, maybe.........if it was designed to put out more Hp than the little one, and then throttled back. If the two were designed and built too put out equal hp, not sure there would be an advantage.
Anyway, that's what the HP/hrs/ gal is in the Nebraska tests. Basicly a fuel efficiency rating, the higher the better. |
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| I remember from my machinery management class at school to figure .048 gallons/hp/hr. so a 100 hp tractor would burn about 4.8 gallons per hour. Friend runs a haygrinder with a 650+ engine on it and he said it burns right at 32 gallons per hour. 650x.048 = 31.2. |
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The Palouse North Idaho | For a given engine cycle, ie the same compression ratio, power is proportional to air flow which is proportional to the displacement. Same is true for turbo'ed engines same compression ratio and same boost pressure, the bigger displacement engine will produce more power. As far as specific fuel consumption ( gallons/hr/hp) with the same engine cycle, bigger engines will be slightly better than smaller engines because the effects of air flow friction in the inlet and out let passages of the engine are less in a big engine compared to a smaller engine. It's a function of the Reynolds Number . |
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Brandon, MS | Yes.
You may have to go to the manufacturer's engine division website to get the info, but it's there.
I have very close relations with a Deere 4.5L set at 75 HP. It burns 0.40 lbs/hp/hr. |
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Fuel usage per Horse power gal/hour etc
