OK I will put my 50 cents in the discussion. (inflation from 2 cents). Detonation is a full or partial oxidation (burning) of a volume of material at once. It is not a flame front, the combustion occurs throughout the mixture volume at a pace that is more related to pressure related temp rise from thermal radiation and pressure related temp rise than the temp rise of a flame front only. Pour a trail of gasoline for about 50 feet into bare soil and put a match to one end. Woooofff. from the match to the beginning it has a noticeable travel time. If that same combustible mixture was heated with magnetic radiation and compression rapidly there would be a detonation. Detonation is importantly never allowed in a firearm, the powder is burned with flame front based rate of propagation. If not, massive over pressure would be splitting the chamber. The modern knock sensors are designed to keep an engine just barely into the initiation of spark knock. This "edge" provides peak pressure at a crank position a few degrees after TDC. A sweet spot that gives maximum energy transfer to the crankshaft. Is there a rise in pressure in the cylinder when ignited before TDC pushing backward on the engine? Sure, but that is what the flywheel is for. Jim
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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