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).
Ignition systems, detonations, and the testing of magnetos with automatic advance for the 40/50 model.
| Identifier | ExFiles\Box 4\5\ 05-page288 | |
| Date | 10th July 1924 | |
| To Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} c. to BJ. c. to RG.{Mr Rowledge} EFC. c. to HY.{Tom Haldenby - Plant Engineer} E.{Mr Elliott - Chief Engineer} c. to PN.{Mr Northey} H.{Arthur M. Hanbury - Head Complaints} c. to EP.{G. Eric Platford - Chief Quality Engineer} X8790 RL/10.7.24. RE IGNITION & DETONATIONS. 40/50 ETC. X.9790. X.8780. My own experiences confirm that it is not good to have only one ignition governed in a double ignition system, such as we use on 40/50. Naturally it is better to have both governed, but neither is better than only one, if used together, unless the one that had automatic advance was used in the central position. Therefore, fit as quickly as possible magnetos with automatic advance, and test if battery ignition would be better in intermediate position. I got detonations at high speeds owing to pocket ignition - i.e. governed battery - getting early at high speeds. Test relatively increased advance on magneto. R.{Sir Henry Royce} | ||