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i have found this snippet about plugs in the wikipedia page about spark plugs,
The central electrode is usually the one designed to eject the electrons (the cathode) because it is the hottest (normally) part of the plug; it is easier to emit electrons from a hot surface, because of the same physical laws that increase emissions of vapor from hot surfaces (see thermionic emission
any thoughts about this section? what i have infered is that the hotter the material the easier it is to emit electrons. i am however not an expert in thermonic emission and dont know if there is a point where increased temps dont make for better electron flow.
also, i have sent a pm and would like to see the SAE 700081 paper if at all possible
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