![]() ![]() Overnight there was no gap to set, no mis-matched faces to arc and burn and no high speed points-bounce. Edwin Hall in 1879, 100 years before this application! The new devices signaled the demise of both points and fiendishly clever auto-advance mechanisms. ![]() Interestingly, the effect was discovered by Dr. Mechanical points survived in the automotive markets until around 1979, when Lucas, Bosch, Magnetti Marelli, AC Delco and Nippon Denso all changed over to transistorised, Hall Effect devices. Opening the points triggers the HT Coil to send a single jolt down the HT lead and across the spark plug gap. CB point systems rely upon the profile of a rotating cam to open and close the gap between 2 tungsten "pads". Once triggered - Kapow!!Ī majority of our IC Engines were developed to run with Contact Breaker Points and a High Tension Coil, powered by a battery pack. ![]() A high current at low voltage is generated by the magneto, then transformed to a high voltage by an integral transformer. With this system the HT Magneto is a separate component geared to, and driven by the engine itself. The elegance here is that no battery is required. In the early auto-industry (<1918), the HT Magneto ruled supreme. Now repeat - 100 times each second (6,000rpm)! The compressed fuel/air mixture, drawn into your engine is detonated by an electrical spark, triggered when the piston reaches Top Dead Centre (or within a few degrees). The basics of Spark Ignition are easy to grasp.
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