From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
The features, benefits, and operation of the SYNCHRO-START system.
| Identifier | ExFiles\Box 62\1\ scan0360 | |
| Date | 4th February 1936 guessed | |
| In the event of a stall on a hill, SYNCHRO-START will prevent the car rolling backwards and permit the driver entire freedom. The engine will be re-started as soon as the accelerator pedal is depressed. The method of controlling SYNCHRO-START influences other accessories in a decidedly advantageous manner, during the normal running of the vehicle. SPARK PLUGS: Automatic compensation for burned points. It is proved that SYNCHRO-START will increase engine speed approximately 200 rpm over that ordinarily within the scope of the coil. PETROL: Saving of six percent on an average. STARTER: BATTERIES: Less peak load demands, giving an estimated saving of current of 20% with reduced wear and tear. PINION AND RING GEAR: As re-starting is accomplished with a revolving fly-wheel no load is exerted before thorough meshing, therefore no noise and reduced wear. SPEED: Increased from one to two miles per hour. COLD STARTING: Owing to improved coil operation this is aided materially. SYNCHRO-START changes the time factor of the coil. HOW SYNCHRO-START OPERATES. Please note that the stability of SYNCHRO-START is ensured by the cam shaft and its operation by the make and break contacts. Therefore, as long as the essential electrical equipment can operate, SYNCHRO-START will start the engine and improve ignition during normal running. On performance, SYNCHRO-START has no competition. SYNCHRO-START embodies a transformer having its primary circuit in parallel with the primary ignition circuit. Consumption is 0.25 amp. at 6 volts (12 volt instruments are available). The interruptions in the primary circuit cause an induced current in the transformer secondary winding. The value of this secondary current is in direct ratio to the speed of the interruptions, i.e. camshaft speed. Included in this secondary circuit is a relay (which is adjustable as to cutting in and cutting out speeds). Normally, the relay closes the starter control circuit by gravity when the engine is idle and the ignition | ||