13.33 - Residual Ionization and Rotation - Krupa explained: "I have coined the term residual ionisation to describe the effect of the firing of the FireStorm spark plug. When a generic spark plug fires in a pressure chamber or your vehicle, it will fire six to eight times and then misfire once. The misfire is caused by the residual ionisation left around the plug proper. When the charge comes down the centre electrode, it sees a high impedance and cannot jump the gap, hence a misfire.
"There is also residual ionisation left over in a FireStorm spark plug. However, because of the huge surface area in the configuration of the domed centre electrode and the triaxial ground system, when the residual ionisation rears its ugly head the charge coming down the centre electrode sees it and moves to the next area under the triaxial ground system that is residual ionisation free. That's why the plasma appears to move around the dome in a circular motion." http://www.robertstanley.biz/firestorm.htm