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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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