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Old 06-26-2008, 07:23 AM   #7 (permalink)
Shawn D.
Harebrained Idea Skeptic
Join Date: Jun 2008
Location: Alpharetta, GA
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The White Car - '84 Mercedes-Benz 300td
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Originally Posted by Lazarus View Post
You can mod a pair of NGK's by drilling a 3/32 hole in the side electrode so that the spark explodes through the center of the strap. It seemed to help rpm revs. It's basicly the same thing except it's less then $2 a plug. I did not see an increase if FE but it did seem to run better.
The perceived improvement was probably due to the sharp edge of the hole, not the hole itself. I'd be concerned about the tip of the ground electrode overheating now that the cross-sectional area is reduced there.

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