I wonder if my dyno man knew something, when he changed by plug gap from
.060" to .048", that Jim and the others have indicated. I am now
inclined to leave my gap at .048" after reading the postings on the net.
I have also learned a lot about plug gaps, after reading the net sites
from Bob.
Larry
James Barrett wrote:
>
> Folks,
> I used to think I knew a bit about spark plug
> gaps, but I did a simple expermient and now I am not so
> sure. I took a 30K volt power supply and connected up
> a typical spark plug to it in open air. Nice thick arc
> was apparent. I then gently blew on the arc and the
> arc formed into about a 1/4" simicircle. When blowing
> very hard the arc could be blown even in a bigger
> simicircle. Now explain to me how a spark plug gap
> has any meaning inside a cylinder when the incomming
> air velocity is much much higher than my breath (and in
> Florida just as humid)? I assume that air entering
> the cylinder is in the range of 100+ Mph. I assume that
> the formation of ionization through the air /fuel mixture
> is much much faster, i.e. the speed of a lighting bolt;
> but once the arc starts, does it get blown around due to
> the incomming air/fuel mixture? It would seem to me that
> wider gaps would have more of a problem with the arc being
> blown around.
>
>
> James Barrett Tiger II 351C and others
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