Yes and no. The diesel engine isn't pumping against a throttle plate at part throttle unlike a part load gasser. Gains there. However a diesel, gas turbine, combustion boiler, wood stove etc. They all loose/waste combustion heat up the stack. If more air is entering the combustion chamber than what is required for complete combustion. The extra air just gets heated but doesn't take part in the combustion process.Then carries the heat out of the stack. Some stationary gas turbines actually restrict the airflow into the engine at part load. That's why when looking at the Nebraska tractor tests. Diesel fuel efficiency at loads under 75% ranges from fair to poor at 25%. As a "broad, general rule of thumb" A diesel makes the most power per gallon of fuel when loaded down to the point of seeing "a little exhaust smoke". The air-fuel ratio will be down at about 15-16 to 1 with about 1% oxygen going up the stack of the 21% coming in. This is one of the reasons a turbo diesel enjoys higher efficiency. At part loads the turbo is just rolling without pressurizing the combustion chamber with un-needed air.
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Today's Featured Article - The Engine Rebuild Kit - by Curtis Von Fange. I always liked engine rebuild kits. They have all the replacement parts for overhauling an engine without going to the store to get gaskets, special measuring tools, or miscellaneous parts. They come neatly packaged, clean and tidy. But it's important not to let that packaging lull you into a false sense of security. The appearance of matching sleeves, pistons, rings, and bearings can cause frustration and agony if not properly measured and installed in a workshop environment. Following c
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