Pontiac Montana Ignition Coil

The ignition coil converts the 12 volts provided by the vehicle's battery and charging system into 15000 to 40000 volts required to jump the gap between the spark plug electrodes and ignite the air/fuel mixture in the cylinders. The voltage increase is achieved by the connection between the primary and secondary circuits in the ignition coil. The low-voltage primary circuit comprises the battery and charging mechanism, the ignition switch, the ignition device, and the main winding of the coil, while the secondary circuit includes the secondary winding of the coil, the high voltage lead, distributor cap, rotor, spark plugs and spark plug wire.

A conventional ignition coil comprises two coils of insulated copper wire, the primary and the secondary coils, wrapped around an iron core, within a plastic, epoxy, or silicone covering. Several hundred thicker winding, approximately 0.030 inches (0.75 mm) of primary wire diameter, surround the core. The smaller, roughly 0.025 inches (0.63 mm) diameter secondary wire encircles the iron core with several thousands of winding inside the primary winding. The primary winding is attached to the battery and the trigger mechanism with the terminals on the coil housing. The secondary winding is attached to the high voltage tower of the coil. When the ignition switch is turned on, the current flowing through the primary winding produces a magnetic field. When the current flow is disrupted by the triggering device, the collapsing magnetic field induces an electrical current in the secondary winding, raising the voltage values up to 15,000 to 40,000 volts.

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