Spark plugs for IT-7

S

sevenracer

New member
Which plugs are people using in this class? I'm assuming that the OEM spec plugs are too hot for racing.

Also, I have heard about removing a stock washer or spacer to move the electrode further in the combustion chamber. Does anyone have info on this?

Thanks
 
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Our car came with NGK B9EGVs and I'm staying with them. No complaints, but nothing to compare against, either.
 
sevenracer, before you remove any washers & stick the plugs in make sure you DO NOT have the electrode sticking into the combustion chamber. The apex seal will hit the electrode, break the apex seal & destroy motor parts.

Have Fun
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David
 
I've tried 3 or 4 different plugs with no noticeable difference other than price. Autolite AR3932, NGK B9EV, NGK B10EVX and another Autolite racing plug that I can't find a number for in my papers (car is in winter storage). Just make sure you don't foul plugs, especially watch trailing plugs. It makes a noticeable difference in performance. Car seems to run OK but will be flat, sluggish.
 
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