Usually yes. I have a Jacobs ignition on the Healey. For a spark event, initially it is high voltage. When the spark occurs, the computer senses that and switches to a lower voltage, but higher amperage to maintain the spark for a longer period.Pretty sure--but not positive--that the duration of the spark event will be the same no matter,
I'm not following you here. If dwell is constant with time, when you increase the RPM, the spark would need to come earlier, further into the dwell period the higher the RPM goes.the dwell--in time--remains constant (although dwell is measured in degrees of cam rotation, it's really a measure of time).