In a message dated 8/9/98 7:24:27 PM !!!First Boot!!!, DANMAS@aol.com writes:
>
> If the internal HT towers are wired together, then the plugs are wired in
> parallel, not series. Both plugs fire at the same time, but the current
> doesn't flow from the tip of one plug to ground, through ground to the
other
> plug gap, and then back to the coil. Current flows through both plugs to
> ground, and then back to the coil. Current flow through each plug is
> independant of the current flow through the other (or very nearly
> independant
> - TOTAL current flow from the coil impacts the output of the coil, which
> will
> impact current through both plugs).
>
I believe the plugs must be wired in series. If two plugs were wired in
parallel, only one would fire. When a spark occurs the air in the gap ionizes
and becomes a low resistance, essentially a short circuit for high voltage.
One plug would always fire before the other and bring the voltage down too low
for the other plug to fire. In open air it takes 75 volts for every .001 inch
of gap to cause a spark. So for a plug gapped to 25 thousandths it would take
1875 volts to make it arc. I don't know if this holds true inside the cylinder
when you add in gasoline and the compression.
Bob Donahue (Still stuck in the '50s)
EMAIL - BOBMGT@AOL.COM
52 MGTD - under DIY restoration NEMGTR #11470
71 MGB - AMGBA #96-12029, NAMGBR #7-3336
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