||The ignition system ignites the fuel in the gasoline engine. There are three general types of ignition system: breaker ignition; electronic ignition; and direct ignition.
||The ignition system provides a spark between the spark plug electrodes. The spark must occur at precisely the right time in the engine cycle, and it must have sufficient energy to bridge the gap and ignite the air-fuel mixture under all operating conditions.
||The primary components of the automotive ignition system are: battery, spark plug, engine timing, distributor, spark intensifiers and high tension (HT) leads.
|Vacuum & centrifugal units
||For any given engine speed the correct spark timing varies according to: air/fuel ratio, octane rating, engine speed and engine load.
|Plug firing voltage
||The plug firing voltage needed to establish the spark is higher than the spark voltage needed to sustain the spark.
|Faraday's law||Induction coils operate according to Faraday's law in order to step up the nominal battery voltage to the voltage needed to bridge the gap across the spark plug electrodes.|