In a message dated 98-08-10 19:30:27 EDT, Bob MGT writes:
> 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,
Good point! It makes a lot of sense, yet if the high tension leads to the two
plugs are connected at the HT lead of the coil, as Rick Morrison stated (or as
I understood him to say), then they are wired in parallel. I guess I'll have
to do a little more digging. Looks like I'm going to have to forget everything
I know about traditional ignition systems (which ain't very much), and start
learning all over again.
Thanks,
Dan Masters,
Alcoa, TN
'71 TR6---------3000mile/year driver, fully restored
'71 TR6---------undergoing full restoration and Ford 5.0 V8 insertion - see:
http://www.sky.net/~boballen/mg/Masters/
'74 MGBGT---3000mile/year driver, original condition - slated for a V8 soon
'68 MGBGT---organ donor for the '74
|