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 01-30-2002, 16:46 Post: 35106
MarkS



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  Diesel efficiency and Aircraft Engines in WWII

And don't forget, as a general rule diesels are more fuel efficient than gas engines






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 02-01-2002, 07:37 Post: 35153
MarkS



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  Diesel efficiency and Aircraft Engines in WWII

Any Mechanical engineers out there who spend alot of time calculating efficiencies of engines? Its been too long since my Thermo or Heat transfer couses to remember the exact equations etc, but I do know that the Compression Ratio of the engine has a ton to do with how efficient it is. Therefore the diesel does better than gasoline (i.e. MOST gas engines are anywhere from 8-10:1, racing engines are much higher, while diesels are somewhere in the neighborhood of 20:1 for compresion ratio) unfortunately double the compression ratio does not=double the efficiency.

TomG, it would be interesting to know what a gallon of diesel can produce in BTU's vs. a Gallon of gasoline. I had never put much thought into that, but if diesel is much higher we all might be a little embarassed and find out gasoline engines are more efficient, but I doubt it.






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