Point gap

Jadaharabi said

I think you have this backward it is the time that the points are open that allows the coil to build up energy in the condenser. As soon as the points close the field collapses causing the spark.

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Nope. Dwell is the amount of time in distributor degrees that the points stay closed thus charging the primary windings in the coil. As soon as the points open (break) the coil discharges through the coil wire to the cap, rotor, and to the individual plug wire.