Just from a practical standpoint, how do you adjust the gap on a four electrode plug if you don't have the special tooling. I suspect that this cannot be done in the field therefore necessitating plug replacement.
Single electrode would have to be a better proposition for earthbound application and work just fine on millions of engines.
David
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Hell no! I'm not that old!
Last edited by motto; 15-04-20 at 02:40.
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