Why is the 34 so fuel thirsty

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Lepke,
It’s economy in a big way. The turbo engine can be much much lighter than the natural aspirated engine. Costs half as much. Burn less fuel .. not as much heat loss from the smaller engine. Smaller fuel tanks. Lighter boat not so deep in the water means less power required to push at a given speed. Less fuel burn again.

Sure if you compare a given boat w a 6-354 Perkins with and w/o the turbo of course it’s going to burn more fuel w the turbo. But you should compare a given boat w X amount of power w a turbo engine and X amount of power w/o a turbo. Different engines of course. The turbo engine would be about half the size and weight of rge NA. Then you’ll find the turbo is very much more efficient.

Tell me if I’m wrong about any of this as I’m not very turbo savy.
But I think it’s true.

But of course this has nothing to do w the M34 being not very efficient. By the way the M34 is probably quite efficient at 20 knots for a boat of that size and weight.
 
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I think the word you are looking for concerning turbo-diesels is efficiency.
 
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