Gray Plugs

[Bruce Plecan]

Often from the voltage firing demand being excessive.   The ion trail is
poor, and the spark forms down the ceramic.   Little less timing, or more
fuel should cure it.  There was an additive package some years ago that was
also bad for that (Union 76, I think it was)
Bruce

>
> p.s. speaking of plugs, what is the reason for 'spider webbed' plug
insulators?
>


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