Detroit 6-71 generator

John924960 · Feb 4, 2020

I am looking in to buy a 6-71 Detroit generator to run the pump for a well on some new farm ground it is 115 kw runs at 1890 rpm there is Also a coulpe of 12v71 I am looking into because they are cheap but my biggest question is how much fuel will the two engines burn per hour i would like to get the 12v71 because eventually there will be 3 or 4 pivots out there and the 6-71 won t have enough power but it will for the first year

coshoo · Feb 4, 2020

Some will know better than I, but I think fuel consumption with the 12 will be more than the 6, but not nearly twice as much, because the 12 will be loafing. I'd get the 12 if you're going to need it anyhow. The less transactions, the better, as far as I'm concerned.

Bob · Feb 4, 2020

(quoted from post at 11:52:36 02/04/20) I am looking in to buy a 6-71 Detroit generator to run the pump for a well on some new farm ground it is 115 kw runs at 1890 rpm there is Also a coulpe of 12v71 I am looking into because they are cheap but my biggest question is how much fuel will the two engines burn per hour i would like to get the 12v71 because eventually there will be 3 or 4 pivots out there and the 6-71 won t have enough power but it will for the first year

Not to tell you what to do, but in my humble experience even though those may be a "cheap" engine to buy the parts have gotten outlandishly expen$ive nowadays.

The 2-cycle Detroits have been out of production for civilian use since the early 90's, a nearly a quarter of a century ago.

rustred · Feb 4, 2020

I know I sure would not want the fuel bill for either one of
those engines if running steady. Just throwing number of
about 10 gallons per hr. For the v12. I know on oil rigs they go
through a pile of fuel.

buickanddeere · Feb 4, 2020

A 200HP diesel operating at 190HP burns less fuel than a 400HP diesel operating at 190HP.
The 6-71 will carry up to 140Kw with the proper injectors, blower speed & air cleaner. The N series piston/sleeve update with the C70 series injectors will increase fuel efficiency.

ss55 · Feb 4, 2020

Those engines have been around long enough that there should be some fuel consumption charts available. Those charts are most likely published by the engine manufacturer, I would look in the sales literature, or engineering applications literature for each engine. If you can determine the RPM and horsepower (or torque) needed to run the different pumps, you should be able to determine how much fuel each size engine will consume.

doublebass73 · Feb 4, 2020

The 6-71 sounds the best so get that.

MarkB_MI · Feb 4, 2020

The 71 series engines have a specific fuel consumption of around 0.4 lb/hp-hr. Assuming 7 lb/gal fuel, that's 0.06 gal/hp-hr. At its rated 115 kW load, the generator will need around 155 hp, which works out to about 9 gallons per hour.

But of course the generator won't be running anywhere close to its rated power most of the time. How much fuel it burns will depend on how big your pumps are. So if you have two 50 hp pumps running at rated output, the fuel consumption would be about 6 gallons per hour. Fuel consumption depends more on how much power your pumps require than on the particular engine powering the generator.

Specific fuel consumption goes up as the load goes down. Although the SFC of all 71 series two valve naturally aspirated engines are similar, a 12V-71 will always burn more fuel than 6-71 at the same load because it will be operating at a higher SFC.

A turbocharged engine will have a bit lower SFC than a naturally aspirated engine. And the four-valve 71N-series engines will have lower fuel consumption than the two-valve 71-series.

RBMI · Feb 4, 2020

A 6-71 genset, running with a light load, will ?wet stack? quite a bit. I would think a 12v-71 would do the same. It can get messy. I would pay a little more
and get a Cat.

Detroit 6-71 generator

John924960

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coshoo

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Bob

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rustred

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buickanddeere

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ss55

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MarkB_MI

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RBMI

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