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I was told this, but never verified it.
One reason cars switched from 6-volt to 12-volt (when I started
driving, most cars were 6-volt) was that the time constant to charge
up the condenser (what we call the capacitor) was too long to
effectively fire eight spark plugs at normal rpm speeds. As V-8's
became popular, the 12-volts became necessary. Of course the time
constant would not change as the voltage went up, but double the
voltage would lead to double the charge which was then enough to fire
the plugs.
True or false??? -- whatever, it makes for an interesting
calculation.