Abstract An ignition timing change-over device adapted for use with a dual-point distributor to improve engine operation during engine starting and warm-up. The retarding breaker contact of the distributor is connected to the primary side of the ignition coil by way of first and second serially connected relay switches which are normally closed. The first relay switch is adapted to open when its solenoid coil is energized by closing of a starting switch. The second relay switch has a solenoid coil connected to a d.c. voltage source by way of a thermostatically controlled switch which remains closed to energize the solenoid coil of the second relay switch to open during the warm-up operation of the engine. During the engine starting and warm-up operations, either or both of the two relay switches is kept open to interrupt the retarding breaker circuit so that an ignition advance takes place.
In an ignition system for an internal combustion engine having a dual point distributor, an normally closed relay switches connected in series with each other between the retarding breaker contact of the distributor and the primary side of the ignition coil and having respectively a solenoid coil, the solenoid coil of the first named relay switch being connected to the d.c. voltage source via the starting switch for being energized to open the first named relay switch during the starting operation of the engine, a thermostatically controlled switch connected between the solenoid coil of the second named relay switch and said voltage source, and a bimetal member adapted for sensing the engine temperature and for opening said thermostatically controlled switch to de-energize the solenoid coil of the second named relay switch, whereby an ignition advance of the distributor is effected relative to the normal retarded condition during the starting and warm-up operations of the engine thereby to increase engine performance efficiency.
Claim 2
Dependent Claim
161 words
In an ignition system for an internal combustion engine having a dual point distributor, an normally closed relay switches connected in series with each other between the retarding breaker contact of the distributor and the primary side of the ignition coil and having respectively a solenoid coil, the solenoid coil of the first named relay switch being connected to the d.c. voltage source via the starting switch for being energized to open the first named relay switch during the starting operation of the engine, a thermostatically controlled switch connected between the solenoid coil of the second named relay switch and said voltage source, and a bimetal member adapted for sensing the engine temperature and for opening said thermostatically controlled switch to de-energize the solenoid coil of the second named relay switch, whereby an ignition advance of the distributor is effected relative to the normal retarded condition during the starting and warm-up operations of the engine thereby to increase engine performance efficiency.