Quote:
Originally Posted by 30 Closed Cab PU
My understanding is that the rated value above is either 6 v or 12 v dependent on the battery voltage. As you indicate the high voltage is generated when the points open, and this voltage is limited to the voltage required to start the spark. The high voltage is limited by the gaps at the rotor and spark plugs. Once the gaps are sparking the coil secondary is basically shorted to ground since the ionization in the spark basically a short. So the coil does not reach it max high voltage max. rating.
So the rated value above is battery voltage, not the max gap voltage that the coil can jump.
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A coil builds voltage through resistance when the points are closed and discharges when they are opened..the base charge voltage of a coil is either 6v with a 1.5 ohm resistance or 12v with a 3 ohm resistance it uses this resistance through a series of windings to create with the pertronix flame thower 40,000 v at discharge when the points open. Arc distance across a rotor /cap lowers voltage,as does a wider spark plug gap,both of theses gaps affect timing (slightly) as well...I don't quite understand your theory as described.