Thanks you very much for the info. I'm running 8.5mm MSD wires.
Robert Trottmann
rotrottmann@davidson.edu
Nicholas McKinney wrote:
> At 07:13 PM 3/11/98 -0600, you wrote:
> >> The plug gaps are relatively small showing that not much power is used
> in the
> >> system, and the engine is set up to run richer than typical engines of
> yesterday.
> >> Leaner engines need a serious spark to ignite them. (another point here is
> >> that NOx is hard to clean once created and running the engine richer will
> >> lower this amount but will create more HC which is then easily converted
> >> into H2O and CO2 by the cat)
> >
> >The plugs are currently set at .035 in. I have MSD, Blaster 3, Headers,
> and an open-
> >element air filter, along w/ glaspacks. When I replace my spark plugs,
> what should my
> >gap be? It seems from above that I should gap them to more than .035
> in.Thanks,
> >Robert Trottmann
> >rotrottmann@davidson.edu
>
> Hello Robert,
>
> Well you are limited by the plug wires and the ignition cap as to what
> voltage can be used safely, larger gaps means higher voltage potentials. I
> would reccommend going to .055" maximum to see what happens as your
> ignition should handle that quite easily. What plug wires are you using?
> If memory serves me well the plugs you probably have are the Champion
> RC12YC (or equivalent), you could install a set of RC12YC5 to try out the
> larger gap. The 5 at the end means the same plug with the larger gap.
> Also I always use antiseize compound on the plug threads as it is highly
> conductive, and dielectric silicone grease in the plug boot to help keep
> the nasties out. You could try this experiment yourself as the plugs only
> cost about $1 or so apiece (read no Splitfires :-). With the antisieze and
> dielectric the total cost should not go over $12 or so.
>
> I think that both MSD and Jacobs reccomend this gap as the maximum also.
> The places I would not use this large gap is with a super/turbo charged
> motor, or a real serious drag race motor, as in one going above 7000rpm.
>
> Regards
>
> Nicholas
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