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Old 03-15-2013, 01:28 PM   #11 (permalink)
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Originally Posted by mechman600 View Post
Originally Posted by mwebb
peak combustion pressure must happen at about 14 degrees after top dead center

Is this true will all engines? Four stroke/two stroke? Gas/Diesel? etc...
Just curious. I have never heard the 14 degree ATDC figure before.
Peak pressure can happen anywhere in the expansion stroke, but 14 degrees is best for converting burning fuel into motion.
It's true for all piston engines where a reciprocating piston is connected to a crank via a connecting rod. 14 degrees ATDC is where the piston-rod-crank leverage is optimum. It is just geometry so: Otto, Diesel; 6, 4, or 2 stroke; any fuel... doesn't matter.

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