fuel economy question

[user removed]

Is 180 grams/per shaft horsepower good as far as fuel consumption. I recently acquired a Honda 9HP diesel engine from my brother. It's 411 CC (25 cu in) at 9 HP @3600 RPM and 15 foot pounds of torque at 2500 RPM.
Assuming it's max power of 9 HP and 180 grams per HP, does that mean it would use 9X180 grams of fuel to produce 9 HP sustained?

regards
Mech

[user removed]

Looks like about 240 grams per KWH, not really great, about 33-34% efficiency. Probably pretty good for a single cylinder engine.

regards
Mech

[euromodder]

Originally Posted by Old Mechanic

Is 180 grams/per shaft horsepower good as far as fuel consumption. I recently acquired a Honda 9HP diesel engine from my brother. It's 411 CC (25 cu in) at 9 HP @3600 RPM and 15 foot pounds of torque at 2500 RPM.
Assuming it's max power of 9 HP and 180 grams per HP, does that mean it would use 9X180 grams of fuel to produce 9 HP sustained?

Yeah, that would be about 1.6 kg or 2L or 0.5 US gal per hour at 9HP - not really efficient.

[oil pan 4]

High fuel consumptions is from it being a 3600rpm motor.
If it were a multi cylinder 1800rpm motor it would have fuel consumption of about 1/3 of a gallon per hour at half running about a 2kw load.

But if it was free, thats hard to beat too.