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).
Technical discussion on the pros and cons of battery ignition systems and a comparison of ignition timings.
| Identifier | WestWitteringFiles\G\July1921\ Scan16 | |
| Date | 1st July 1921 | |
| contd. -2- 1. Automatic advance. 2. The condenser has permanent connections. 3. When water is sprayed through the radiator when the car is being washed, it will not short circuit the distributor. The distributor we use on the 40/50 chassis is bad in this respect owing to the flat surfaces. 4. There are less parts to wear on the contact breaker. 5. Considerably less costly. The weakness of any battery ignition, we find, is the contact breaker. It is apparently the experience of the "Delco" who duplicate the contact breaker on the "Liberty" and "Marmon" sets. We would recommend that Springfield ascertain from the Bosch Company whether a longer life would be obtained from the contact points if platinum iridium were used. We think that if it is possible to get anything which is cheaper, better, the question of cost should not stand in the way. Ignition Timing on present 40/50 chassis. Retard 10° B.T.D.C. Advance 38° B.T.D.C. Total range 48°. Timing of U.S.A. Bosch Ignition. Handle control - retard 16° B.T.D.C. Advance 6° B.T.D.C. Handle control range 24°. Governor control range 36°. Total range 60°. contd:- Handwritten notes: X1878 X1879 X928 | ||