Posted by showcrop on October 28, 2020 at 04:18:59 from (75.68.37.174):
In Reply to: spark plugs again posted by flying belgian on October 27, 2020 at 10:24:46:
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Pete, your explanation is perhaps actually an observation. Here is what is happening: Combustion is a reaction which consists of the ionization of the fuel, causing dramatic expansion which is what generates the energy. The first stage of combustion is the spark. in order for the spark to propagate across from one electrode to the other the molecules of fuel in the path have to ionize which takes high voltage. The cylinder pressure is a dampening force on the expansion that ionization requires. The spark is, so to speak, being delayed by the squeezing of the molecules under pressure. Smaller center electrodes will propagate a spark better under high pressure, but they erode away faster unless they are made of iridium.
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