One of the primary factors is engine speed. When a tractor turns 2000, there is way more time for the flame front to over pressure the remaining fule and air detonating it. The 6000 to 7500 RPM of a (then) hot engine allows the combustion to happen in 1/3 the time (about, and in milliseconds) Maybe one way to reduce detonation would be to put an adjustable stop on the advance, and set it back about 5 degrees from factory spec. I still think oil cooled pistons work well. Jim
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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