What the hell did I blow up this time? The answer and now

[SJ]

I realize that that is what is happening. But why?
If a vacuum is the perfect insulator, then anything less than vacuum would
encourage a spark. Is not the combustion chamber a "denser" atmosphere when
under load than when under no load? A denser atmosphere would lower the
insulation factor for the spark . . no? Unless, vacuum is not the perfect
insulator. Perhaps I'm mixing up the facts that vacuum is the perfect heat
insulator . .but not such a good dielectric insulator?

The more packed and more rich an air/fuel mixture . .the greater the
dielectric insulation?

> From: Robert Myers <robert at s-cars.org>

> You are missing the scientific fact that an arc is more easily produced at
> low gas pressure than at high gas pressure.
<snip>

>>SJ wrote:
>> But . . . .one would think that a richer air fuel
> >mixture(under load) would result in a lower resistance for the spark. So
why
> >does the plug fire ok at low loads and miss at higher loads??  What am I
> >missing here?
> >
> >There must be some physicists in the group that can explain the
phenomenon.