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Re: Why does it require more to jump a plug gap 'backwards'?
Posted to Technical Theory Forum on 4/30/2013

I don't know the answer, but I found this page relating to it interesting:

[...] [[...]]

"...When polarity at the spark plug terminals is positive, it's harder for the voltage to jump across the air gap than when polarity at the plug terminal is negative. ... Login to read more.