Ignition System: Description and Operation

Ignition Circuit:

This car uses solid state ignition system.

The basic components of the ignition system are ignition coil, distributor and spark plugs and those of the distributor are signal generator (signa rotor and pickup coil), igniter, rotor, cap, vacuum advancer and centrifugal advancer.


When the distributor shaft rotates, the magnetic flux passing through the pickup coil varies due to the change in air gap between the pickup coil and the signal rotor. As a result, the alternating current voltage is induced in the pickup coil.

The voltage induced, turns on and off the igniter which switches off the ignition coil primary current. Thus, the high voltage is induced in the secondary winding of ignition coil and ignition sparks are generated at the spark plugs.


The spark advance is produced by the vacuum advancer which operates based on the engine vacuum and centrifugal advancer.