Re: Dual Condensers?
Kevin pretty well covered it but I will add a couple things.
The PRIMARY purpose of the capacitor in a coil /points/capacitor circuit is to tune the circuit to RESONANCE. When this is achieved, the impedance of the circuit is at maximum and current flow is minimum. Current flow being minimum is where the points will have the longest life.
Any deviation from resonance by adding capacitors will shorten points life.
The efficiency or “useful quality” of resonant circuits is measured in “Q’s”. An iron core coil has a very low Q therefore can tolerate a fairly wide variation in capacitor value before circuit efficiency falls off enough to shorten points life so you can really notice it.
Actually the ideal place, electrically, to mount the capacitor is directly across the coil terminals.
Mechanically, this is not a good place for several reasons. Mechanically, the best place has been inside the ignition case.
The distance the capacitor, coil and points are separated will have little impact on efficiency of the circuit due to the very low Q.
In radio circuits, the exact opposite would be true.
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