grizer
Member
What would be the gph of a DK65, light work?
Oil & Fuel Gallons per hour
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dex3361
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For a well tuned diesel engine of a wide range of HP the following is pretty accurate.
A good rule of thumb to get you in the ball park is 0.07 to 0.08 gallon per hour per HP produced.
That is with the machine operating in the 25% - 100% HP range. Some will do a little better and some a little worse.
steve0413
Silver Member
If my calculations are correct, then my DK45 would use about 3 gallons per hour. Though I haven't really checked it, I can say I get much better gph than that. I've always thought mine was in the 1-1.5 gallons per hour range. Maybe I should check it closer.
IslandTractor
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Three gallons per hour for a DK65 seems very high even if you are running at PTO speed under load. My DK40se gets something close to a gallon and hour working hard.
johnrex62
Platinum Member
I am pretty sure my usage is just a tad over 1 gallon per hour when brush hogging. Formula says it should be closer to 3 for gross hp and 2.5 for PTO hp.
Formula may not be well suited to these modern compact tractors.
Formula may not be well suited to these modern compact tractors.
dynasim
Platinum Member
His rule was gph/hp **produced**. Most people don't load their tractors to anywhere near full capacity.
50% of rated capacity sounds like a good number for most operations, and that would make the calculation consistent with use.
Just running at full speed with no external load consumes ~5 hp, and its associated fuel, on my tractor, and my usage doesn't increase much no matter what I do(I don't do tilling).
Chris
50% of rated capacity sounds like a good number for most operations, and that would make the calculation consistent with use.
Just running at full speed with no external load consumes ~5 hp, and its associated fuel, on my tractor, and my usage doesn't increase much no matter what I do(I don't do tilling).
Chris
dex3361
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The amount used depends on the HP required. Most people only use maximum HP in short spurts. I have a 44HP Kubota and I get between
0.75GPH(best) - 1.5GPH(worst). If I loaded it as full as I could get it and held it steady at that load I would use about 3GPH. I ran into this rule of thumb while sizing large generators some over 1 megawatt. The rule still applies. Just gets you in the ball park. I tested my little 6.5 KW diesel generator with a known load so I knew the KWs and it fell in the 0.075GPH per KW.
1 HP = 746 watts
steve0413
Silver Member
I thought his calculations were in the 25% - 100% range. I would think I'm in the 25%+ range for most of my work. If not, I bought too big of a tractor.
dex3361
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I thought his calculations were in the 25% - 100% range. I would think I'm in the 25%+ range for most of my work. If not, I bought too big of a tractor.
The rule of thumb calculations are more accurate in the range of 25%- 100%.
I thought this was useful for planning. Remember it is a ballpark number.