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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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