> > One possible explanation is glazing ... basically a conductive coating
> forms
> > on the ceramic surface, that conducts enough to bleed off the spark
> voltage
> > before it gets high enough to jump the gap. The usual cause is a plug
> that
> > is running too hot, so I'd start by trying one range colder plugs.
> >
> > Randall
> ---------------------------
> Randall, would applying a light coat of dialectric to the ceramic
> help keep
> glaze and conductivity to a minimum, or would the heat do it in?
We're talking about inside the combustion chamber here ... I don't know of
any better dielectric than ceramic at those temperatures. The 'glaze' is
deposited on the ceramic (basically melted fuel deposits is what I
understand it to be), so it would likely be deposited on anything else just
as well. But in all honesty I've never tried it, since glazed plugs have
never been a problem for me.
Best solution IMO is to solve the plug overheating and/or fouling problem
that leads to the glaze.
Randall
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