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 - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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