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Bicycle Bob · 06-08-2009, 08:22 PM

It isn't inefficient at low RPMs, just weak, because not much air is flowing through. Try to find some details of load, speed, and efficiency on a graph. As long as you are not blowing black smoke, a diesel is usually pretty good at low speed.

06-08-2009, 08:22 PM	#3 (permalink)
Bicycle Bob EcoModding Apprentice Join Date: May 2008 Location: N. Saskatchewan, CA Posts: 1,805 Appliance White - '93 Geo Metro 4-Dr. Auto Last 3: 42.35 mpg (US) Stealth RV - '91 Chevy Sprint Base Thanks: 91 Thanked 460 Times in 328 Posts	It isn't inefficient at low RPMs, just weak, because not much air is flowing through. Try to find some details of load, speed, and efficiency on a graph. As long as you are not blowing black smoke, a diesel is usually pretty good at low speed.