Have a look at the attached article regarding flame speed of various fuels in laminar vs turbulent combustion .
The diesel “knocks” due to the rapid flame speed .
To improve the mechanical efficiency of the reciprocating ICE . The less combustion chamber pressure BTDC the better . And the closer to ATDC that combustion completely occurs and combustion chamber pressure peaks due to heating of the gasses, the better.
Combustion occurring with the piston halfway down the cylinder borie vs when combustion occurs during the first 10-20 greees of crankshaft rotation is very inefficient. More heat lost out through the cooling system , the crank angle is less efficient and there is less degrees of rotation for the pressure on the piston to exert force on the crank.
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Today's Featured Article - Talk of the Town: How to Crank Start a Tractor - by Staff. This interestin discussion is from the Tractor Talk Discussion Forum. Remember that safety is your first priority - make sure you know what you are doing before attempting a potentially dangerous activity!
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