Posted by MarkB_MI on February 04, 2020 at 15:02:15 from (174.230.10.62):
In Reply to: Detroit 6-71 generator posted by John924960 on February 04, 2020 at 08:52:36:
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.
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