Spark plugs are hitting the pistons. Help!

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#12 (permalink)

09-14-2018, 09:33 AM

Bill D

CC Member

Join Date: Jul 2006

Location: Redding, CA

Cobra Make, Engine: FFR chassis and suspension, Mr. Bruce 289 FIA body

Posts: 1,066

Not Ranked

After analyzing the situation more, I’ve come to the belief the piston domes are kissing the plug electrodes.

I just got off the phone with the tech support guy at NGK spark plugs. Told him my situation and they were able to find a shorter spark plug with a better heat range for my compression. Going to get those today install them tonight and crank it over without the coil wire attached. Then I’ll pull a couple plugs and see if that fixes the problem.

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