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 - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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