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 performance of a Watford Sleeveless Magneto Type EW6, including a tester's comparison to other models.
| Identifier | WestWitteringFiles\R\2October1927-November-1927\ 115 | |
| Date | 7th November 1927 | |
| To R.{Sir Henry Royce} from EFC. c. BJ. E.{Mr Elliott - Chief Engineer} c. Da.{Bernard Day - Chassis Design} EY. c. Wor.{Arthur Wormald - General Works Manager} EP.{G. Eric Platford - Chief Quality Engineer} ORIGINAL EFC10/T7.11.27. WATFORD SLEEVELESS MAGNETO TYPE EW6. X 7791 Further to our EFC4/T2.11.27, we have now received the tester's report referred to, the wording of which is as follows :- "We have tested the magneto No.99802 recently fitted to 9-EX car with the following results:- Performance. It is not so good at low speeds as magneto No.99171 of the same type previously fitted. Misfiring occurs during slow running tests on the road and idling speeds. It is O.K. at high speeds. Noise. This magneto (99802) is quieter than No.99171 for make and break noise. It is still audible from the driving seat and also when standing by the car with the bonnet closed. It cannot be compared with the Lucas magneto recently fitted to this car, as regards noise, but it is quieter than the present standard EO6 type. There are no gear noises." Hs{Lord Ernest Hives - Chair}/E.Butler. It would appear that this magneto No.99802 must have had its armature removed and replace while away because - (1) The knocking noise seems to have vanished, and (2) The low speed performance is not as good as when previously tried. Mr. North said they found no reason for actually doing anything to the magneto beyond inspection. These magnetos, although considerably better than the E.O.6 type in many ways, i.e. (1) Better all round performance, with the exception that they are sometimes not quite as good on slow speed running, though it is true that the tests we have made on the present two machines Nos.99171 and 99802 (before alteration) showed the performance to satisfy | ||