When it comes to purchasing ignition coils, there are a few critical factors to consider. The first is the type of ignition coil. There are two main types: coil-on-plug and coil pack. Coil-on-plug ...

This type of ignition system with a separate ignition coil -- a rotor in a distributor that sends electrical current to each spark plug through wires in the cap -- began to phase out in the 1970s.

Inductance also depends on the radius of the coil and on the type of material around which the coil is wound. With inductors, coils and chokes, air cores result in the least inductance for a given ...