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Old 07-24-2011, 08:05 AM   #18
Delfin
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Join Date: Jan 2010
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RE: Fuel Economy Question

Quote:
FF wrote:
"Take a look at the fuel consumption curves of some modern engines."

No doubt , but most "trawlers" have 30-40 year old farm implement or light truck motors.

My own has a 1936 designed DD 6-71.

What a "modern" 30,000 psi rail electronic injected turboed engine has little today to do with most folks.

This WILL change as we see quite fancy auto engines being marinized.

The Yanmar BMW , or Toyota conversions will do quite well at low speed fuel burn , weather they will get 5000 hours at much over half throttle is the question.
*The idea that fuel consumption is much lower on older diesels running at slower speeds is simply incorrect, and not even true about Detroit 671s.* My 3306 is a 50 year old design and at half throttle produces about 90% of the hp per gallon of fuel consumed as it does at 80% throttle - just like the Detroit.* Longevity is not materially affected by low speed use as long as the engine is handled properly per the manufacturer's guidance.

What effect low speed use has on modern engines*may well be more of an issue, but I suspect that even there exercising the engine properly will go a long way to ensuring long life.*
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