Ignition Basics
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This shows the classic inductive-spark scope pattern using points. The voltage spike (A) is the high initial voltage required to ionize a current path across the spark-plug gap. The voltage required to maintain this current flow is comparatively low (B) but you can see that the spark duration is relatively long. After the spark breaks down, the voltage trails off back to zero (C). There are dozens of different patterns based on the type of ignition system. Even an inductive HEI circuit will differ from this pattern slightly. View Related Article
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