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).
Relationship between magneto and battery controls, and proposing a new hydraulic ignition advance mechanism.
| Identifier | ExFiles\Box 37\1\ scan 245 | |
| Date | 18th October 1923 | |
| X 3949 To Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} c.c. EEC. R2/M18.10.23. IGNITION ADVANCE. X.3949. X.928. X.9780. Owing to the greater range if ignition timing required by the EAC. the relationship between the magneto and battery controls should be carefully arranged. The rate of change of advance on the magneto should be about twice as great as the rate of advance of the battery ignition on the hand control. It is highly important to have an automatic advance on the magneto and as soon as there is time I propose that we try the ignition control mechanism I suggested for the original Northcliffe chassis, which advances the ignition hydraulically with oil pressure under the control of a master valve connected to a governor. I should superimpose the hand control movement on that of the governor so thatt the hand advance and the automatic advance would be added together at all times. This governor would control both battery ignition and magneto ignition simultaneously, and of course it has the great advantage that the magneto is firing in its best position always (as in sleeve type). This latter condition I understand would not be obtained with the use of a magneto with governor advancing cam only, such as is used in the "Scintilla". R.{Sir Henry Royce} | ||