Good point, but wouldn't the system be more reliable with parallel circuits?
If, for some reason, you get a misfire, a series twin tower coil would prevent both sides from firing.
If you get a misfire, in a parallel system, at least one side would end up firing...
Side note...
KDR used to sell this ridiculous system which eliminated the trailing spark plugs and fired everything on just the leadings.
If the ignition system were in series, I'd be scared to run it like this...
-Ted
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