Dr, Im in the dark on that particular ignition system (two coils in series for 2 plugs in one head, that's my assumption, right????) but will take that as my guess and proceed.
Okay, if the two coil LV primarys are in series, still when current is interrupted each coils HV secondary will ramp up the voltage until its high enough to fire a good (non fouled) plug. However, if one plug fed by one of the coils is fouled, that coils stored secondary energy will bleed off current through the shorted fouling path (conductive oil or carbon) and there wont be any sudden HV arc i.e. that plug wont fire. HOWEVER I don't see any of that as diminishing the spark the other non fouled plug will produce. I see the other coil still producing as high of an energy spark in the good plug as if there were 2 good plugs. Because the plug fed by one coil is fouled, I dont see that reducing the other plugs spark energy. REMEMBER MY ASSUMPTION IS TWO COILS IN SERIES FOR 2 PLUGS IN ONE CYLINDER That right or wrong?????????????
Now as to how that affects performance????????? I cant say, other then if two explosive wave propagations (one on each top side of combustion chamber) meet in the middle and that is more efficient THEN ONE FOULED PLUG (even if other plug works as good) then maybe theres less efficiency and less power????
Im just NOT familiar with that ignition system, sorry
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