Jim bailey - 928 International

So the F-1 plug has an infinite number of spark paths !

dr bob

There have been a number of "surface gap" plug designs tried over the years, similar to what's described for the F-1 plug. Electrodes that "stick out" are at risk for breaking off under conditions like detonation. These engines detonate almost by design at low RPM's, until the piston speed is high enough to stay up with the speed of the flame front. Surface gap plugs were popular on some hi-perf two-strokes in the 1970's and 1980's, engines that started making serious power in the 10,000-13,000 RPM range. Not quite into the 18,000 RPM range that current F-1 engines spin. but still a lot higher than "conventional" engines spin. I tried a 'street ride' on my late-80's Yamaha TZ-750, a four-cylinder two-stroke. Stoplight launches at less than 7000RPM were a joke since there is virtually no torque. Ride at any legal speed in first gear. Big multi-plate dry clucth in an open basket spewed just a little smoke at every launch, never intended for use this way. Oh, and a new set of plugs every session.

Still, nothing in the plug was 'sacrificed' to make a plasma arc, a concept that seems to be forgotten in the claims made by the original poster's product.

fraggle

Those surface discharge plugs are coming back on some of the new high performance bikes, too.