Early gasoline (petrol) internal combustion engines used a magneto ignition system, since no battery was fitted to the vehicle; magnetos are still used in piston-engine aircraft to keep the engine running in the event of an electrical failure.

The voltage produced by a magneto is dependent on the speed of the engine, making starting difficult. A battery-operated coil can provide a high-voltage spark even at low speeds, making starting easier.

When batteries became common in automobiles for cranking and lighting, the ignition coil system displaced magneto ignition.

In older vehicles, a single coil would serve all the spark plugs via the ignition distributor. Notable exceptions are the Saab 92, some Volkswagens, and the Wartburg 353 which have one ignition coil per cylinder.

1.Detail Specifiion

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3. Factory Display