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I'm shaky on the concepts myself, but. . .

Posted by Chris from Lafayette on July 9, 2017 at 11:18:18:
. . . I found one site where it was stated that in a typical 4-stroke IC engine:
38% of power is lost through exhaust heat
36% of power is lost through water heating
8% of power is lost through motor friction
So, if you subtract all these power losses, you'll end up with only 20% of your original total. You can increase this percentage a bit through the use of certain synthetic oils or ceramic coatings on the pistons and combustion chamber.