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 - Talk of the Town: Modern Diesel Fuel in an Old Tractor - by Staff. This interestin discussion is from the Tractor Talk Discussion Forum. Remember that safety is your first priority - make sure you know what you are doing before attempting a potentially dangerous activity!
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