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 - Recollections of a John Deere GP - by Charlie Cook. I grew up on my dad's 280 acre general farm in Western Michigan. Dad's only tractor when I was very young was the old GP. My first recollection of this tractor was when dad allowed my brother and myself to ride on the tractor with him driving. One of us would sit on the left fender (away from the clutch) and other would sit on the gas tank and hold onto the crankcase breather pipe.
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