Contact breaking for Ignition system:
It is used to make and break the current. To produce a high voltage in the secondary windings, contact break is used to break the primary current in primary winding of the ignition system.
Cam,lever,heel,spring and bush are the main components.
In this contact points one is movable arm and another is fixed arm.in this the number of cylinders is used to find the number of lines on the cam.