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).
The testing and comparison of different Scintilla magneto models for the 20 HP chassis.
| Identifier | WestWitteringFiles\L\2April1924-June1924\ Scan41 | |
| Date | 19th May 1924 | |
| Contd. -2- EFCL/19.5.24. requirements - as follows :- "When we were discussing the magneto with Mr. Royce "I had at W.W. a 20 H.P. car fitted with a Scintilla "magneto which had an automatic advance. This magneto "functioned perfectly. The automatic advance control of "the ignition was equally as good as we get on the "battery and the running of the car was equal in every "way, if not better than on the battery. This magneto "is quieter than the S.C.6. R.{Sir Henry Royce} criticised it from the "point of view that it looked too big and clumsy for the "Goshawk." This, of course, refers to the larger size Scintilla magneto. The magneto has been carried on 7GII for 15,580 miles, but has actually run the car for several hundred miles only. It has now been removed from 7GII, and after certain tests, will probably be placed on an EAC.III. chassis. No other tests than the advance characteristic tests were previously carried out on the bench, on this machine. Owing to the satisfactory results obtained from this magneto it was thought, in view of the weight and bulkiness of this machine as applied to the 20 HP. chassis, desirable for the Scintilla Co. to send us one of their smaller type AM-6-A machines, incorporating all the possible hand and automatic advance they could allow. The second machine AM-6-A No. 26485 was received on 18.5.23. This machine was carried through our experimental routine bench tests, with the results recorded below, but was not at any time put on a car, as in the meanwhile the Watford R.C.1. type had been adopted for the 20 H.P. chassis. The automatic advance found on this machine was in accordance with the section on sheet attached dated 30.1.24, this being exhibited also as a curve on photostat herewith. Cont.4 | ||