Re: electronic ignition vs.points

Posted by John T on March 07, 2006 at 19:41:07 from (66.244.90.98):

In Reply to: electronic ignition vs.points posted by farmallmrestorer on March 07, 2006 at 13:52:02:

Farmall, an electronic ignition switch, ESPECIALLY when coupled up with a high energy coil, is capable of producing more spark energy discharge across a plug gap to better ignite the fuel. As far as pulling, its not so much the pulling but whether or not the engine is souped up with high compression which is where an elec ignition becomes necessary, since at high compression it takes more voltage to arc current across the plug gap which a stock ignition may not be capable of producing. i.e. thats when an elec ignition becomes almost a necessity.

While an elec ignition even with a stock coil (due to faster and more positive switching) can provide improved performance, its the elec ignition PLUS the high energy coil that really gets you the most bang for the buck. If the pulling rules allow it, I would use BOTH. If the rules call for the use of stock points, theres not much gain from simply adding a high energy coil however.

To answer one of your questions more directly, I dont forsee any circumstances (assuming the switch is working properly) where using corrosive and bouncing and ringing mechanical points as the coils current switch could be better then the use of an electronic faster and more positive switch.

As far as any so called "hot plug" the heat range of a plug is a measure of its ability to transfer heat away from its firing tip and ground strap to the relatively cooler head or block. The "hot" has nuttin to do with the amount of energy expended across its gap or spark quality or intensity, its a function of thermodynamics and heat transfer. The "hot" refers to its operatign temperature NOT how strong or weak the spark is. To the contrary, when operatign at very high compressions and high octane fuels under extreme pulling loads and at high combustion chamber temperatures, it may become necessary to use a colder then normal spark plug.

John T, retired electrical engineer in Indiana

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