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Sailboat - 3-53 fuel Consumption

Can you give me the GPH used by a naturally aspirated Detroit Diesel 3-53?


It is used in a 50 year old sailboat and is running around 1800 rpm.


Thanks,
John

spec sheet data
3-53N @ 2000 rpm
land engine

power = 78 hp
consumption = 0.455 lb/hp hour

consumption if constant full power is maintained:
18.9 liters per hour
5.0 us gallons per hour

spec sheet data
3-53N @ 2000 rpm
marine engine

power = 60 hp


consumption if constant full power is maintained:
15.1 liters per hour
4.0 us gallons per hour




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