My insight: The peak combustion chamber pressure is not related to the distance to the piston. It is the moment that 90 or so % of the fuel air is combusting. The flame is going to progress to the farthest location in the chamber and be quenched against the cool iron of the head and piston. (comparative coolness) The peak pressure should come between 10 an 12 degrees after TDC. (a variable) Maximum advance under full power is the specific degree of advance that just begins to cause detonation. Detonation is the increase in pressure and temperature in the cylinder as the fuel burns that causes the remaining unburned fuel to explode through its volume rather than burn. Piston pin offset, compression ratio, chamber shape (including squish areas and surface areas of the crown) fuel octane, and temperature all are variables in the equasion. Jim
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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