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post #4 of Old 05-01-2012
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Re: Turbo charged diesel

In short reliability and fuel consumption. Try running your Harley at 80% WOT for 10K hours. It would be lucky to make it 500 hours. A properly maintained diesel will commonly go 10K hours, 20 times as long. Fuel burn is the other reason. Your Harley runs at perhaps 20% WOT while cruising and would exhibit about .6-.7 BSFC at that setting. At near WOT it would come down to about .45 but you can't maintain that power setting. Your diesel fuel burn is probably closer to .3-.35 BSFC and can maintain near WOT for thousands of hours. IOW at the same (high) power setting, the diesel is 20-30% more efficient and more like twice as efficient at comparative cruise settings. The turbo increases carnot efficiency and thus decreases BSFC in most cases.

BSFC is Brake Specific Fuel Consumption.

Islander 30 MKII "Sojourn"

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