Re: Dual Plug Heads
Aircraft engines are a whole different breed from auto engines. Redundancy is mandatory so they have to have the dual ignition systems. It's the placement of the plug in the cylinder that makes the difference for magneto drop off checks. If the plug was in the top of the hemispherical head, a single spark plug would deliver enough power to get good performance as in the Chrysler hemi design.
Boat racing was BIG back in the day so most of the dual ignition systems were for boat racing. Some of the manufacturers even made covers for the heads to keep the plugs dry. Roof and several other manufacturers made dual plug heads and most of them were into boat racing too.
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