Posted by Indiana Ken on December 28, 2012 at 17:31:16 from (66.249.232.131):
In Reply to: Long arcing sparkplug posted by pete hall on December 28, 2012 at 16:09:22:
As the magnetic field collapses, a high voltage is induced in the secondary windings of the coil. The voltage build up is not instantaneous but rather takes a very short bit of time. This time delay can become a problem when the plug is fouled with conductive deposits. The voltage can bleed off preventing it from reaching a level sufficient to jump the spark plug gap.
Creating a "booster gap" allows the voltage to build up across the additional gap and prevents bleed off across the fouled gap. Once the booster gap becomes ionized, the spark jumps and "appears instantaneous" at the fouled gap. Since there is not sufficient time for the voltage bleed off to occur, the fouled gap becomes ionized and the spark jumps.
In efffect you have reduced the "rise time" of the coil.
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