[pjv911]

H2O, set a camera`s shutter speed to 1 sec exposure and take a snapshot of the splitfire firing 200 times per second and there you go cool picture with sparks on both electrodes and well lit up.
Splitfires are a waste of money except for the patent holder $$$.
While in aviation school I saw spark plugs designed to have the center electrode fire directly to the piston. It looks like a plug with no second electrode. I had wondered if that would cause damage to the crown of the piston.