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 document detailing the specifications and settings for a battery ignition system.
| Identifier | ExFiles\Box 51\2\ Scan163 | |
| Date | 19th November 1923 | |
| Contd. -3- EFC {E. Fowler Clarke - Electrical Engineer} 5/T19.11.23. Battery Ignition. The normal running current of the battery ignition at average speeds is rather less than 1 1/4 amperes. In estimating the output of the dynamo from the ammeter reading, with no lights or other apparatus switched on, it is necessary to add this amount. The hand advance of this ignition allows for 20° on the distributor or 40° on the engine. The automatic advance allows for 15° on the distributor and 30° on the engine. The instruction for the setting of the ignition at full retard is 10° after d.p., in which case the ignition will occur as follows :- Both ranges retarded 10° a.d.p. Hand range retarded with automatic range fully advanced 20° b.d.p. Hand range advanced with automatic range fully retarded 30° b.d.p. Both ranges advanced 60° b.d.p. If a magneto is fitted, this range is set at d.p. on retard and the available advance on the magneto is used on the ignition lever range. The contact breaker operating the ignition should make and break contact at equal intervals. Contd. | ||