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 and detonation issues in the 40/50 model, comparing different ignition setups.
| Identifier | ExFiles\Box 65\1\ scan0006 | |
| Date | 1st July 1924 | |
| X8685 TO HS.{Lord Ernest Hives - Chair} FROM R.{Sir Henry Royce} R1/M1.7.24. copy to CJ. BJ. " RG.{Mr Rowledge} FPC. " BY.{R.W. Bailey - Chief Engineer} H.{Arthur M. Hanbury - Head Complaints} " PN.{Mr Northey} H.{Arthur M. Hanbury - Head Complaints} " EP.{G. Eric Platford - Chief Quality Engineer} re. IGNITION & DETONATIONS. 40/50 ETC. 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} | ||