An ignition coil takes voltage from the battery and multiplies it to create a spark at the spark plugs, which in turn ignites the engine. Cars have been using some form of the coil ignition system ...

The greatest differences can be found in an efficient module and the self-contained coil, which is capable of putting out much more power with less dwell time.

The HEI’s integrated ignition coil in the distributor cap makes it the most compact ignition system in history. No external ignition coil to sweat out.