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Old 01-04-2010, 09:48 PM   #18 (permalink)
gone-ot
...beats walking...
 
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...look up SAE paper #700081:

Spark Plug Design Factors and Their Effect on Engine Performance,
by: Robert J. Craver, Richard S. Podiak and Reginald D. Miller,
of: Champion Spark Plug Co.
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