Each spark, has the potential to spark anywhere in 360-degree perimeter but sparks at the point of the highest air/fuel concentration. The 3 sparks are sufficiently distanced from each other and ignite 3 independent flame fronts anywhere in a 360 degree perimeter each individual ignition impulse, at the speed of light. THE RESULT IS 3 SPARKS AT THE SAME TIME!!! Spark "travels" from the center electrode to the edge of the first conductive ring, uses the ring as a conductor, jumps out from the other edge of the first ring intot he edge of the second conductive ring, uses it as a conductor, and then the spark discharge "jumps out" into the spark plug shell (ground) to complete the secondary ignition circuit. Because these rings are conductive, the rings act as a "short cut" for the spark discharge on the way to ground. On the surface of the spark plug insulator (between the center electrode and spark plug shell (ground) is a conductive titanium oxide compound in the shape of rings, bonded by a special patented process. Spark discharge looks for a path of least resistance from the spark plug center electrode to ground (spark plug shell). That means.with a multiple discharge ignition system (Accel, Crane, MSD, etc.), you will get three sets of three sparks (9 sparks total) per each single primary ignition system impulse.
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