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#11
July 21st 04, 01:45 AM
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"G.R. Patterson III" wrote in message ... Russell Kent wrote: It may be slower, but it doesn't "ring true" to me that the cause is higher cooling drag. Diesel engines are more efficient than gasoline engines because they extract more of the chemical energy as useful work, and less chemical energy is converted to waste heat. With less waste heat, their cooling drag should be *less* than a gasoline engine's. Well, they don't. They have a higher compression ratio, and that produces heat. The SMA diesel is air-cooled, it produces more waste heat than an IO-540, and there's more cooling drag than with an IO-540. Aren't they also heavier, i.e., pound of engine weight per HP generated? 
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