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A CONUNDRUM: SPARK PLUG[S] AS AN ANALYTICAL TOOL
The puzzle of the spark plug is not that it does more than one thing during its interval of operation, but that so few engine operators take advantage of the other feature that it offers.
All engine operators take advantage of its principal feature as the indispensable last link in the transfer of electrons from the magneto, through the cylinder head, to the spark gap within the combustion chamber.