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 - The Great Escape - by Dave Hollrah. It all began Monday with a little baling of second crop on the lake shore field, and as I drove out past my sister and her hubby's place, this small calling sound could be heard from the general direction of their manure pile. Out of the yard, over the cows and bale piles, through the dozer piles, poplars, and brush, out onto the ditch grade road, past the noisy 6.2 diesel engine pulling my well traveled Suburban along. Well it sure didn't take me long to figure out what it was because I alrea
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