Pete's 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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Today's Featured Article - Buying your first tractor: The People You Buy From - by Chris Pratt. If you are a first-time buyer, chances are that you are likely to take the word of the seller on things. This is where the problems start... You have reviewed your implement needs and determined the size of machine that will fit the bill and even made a list of the most desirable models. You checked on the availability of a 3-point hitch for the machines on the list and advertised in your local classified paper with so
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