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).
Potential engine design modifications, particularly regarding carburetters, generators, and magnetos.
| Identifier | ExFiles\Box 75\2\ scan0276 | |
| Date | 19th December 1921 guessed | |
| At the moment we feel that we should let the design rest as it is until we can obtain - 1. Carburetter raised either on the right or left hand side of the engine. 2. Butterfly or other simple throttle for the sake of power. 3. Omission of the governor for the sake of simplicity. 4. Generator driven in place of the magneto with standard fabric joints to drive it. (We already have this on our experimental car.) 5. Magneto driven through the water pump with fabric joints as above. These fabric joints are standard S.A.E. Joints, illustrated in the enclosed blue print. In connection with the Goshawk, have you tested any of the simpler or more automatic and less adjustable types of carburetter? It is pointed out by good authorities in this country that in order to obtain maximum spraying of the gas it is most desirable to arrange that all the air admitted to the carburetter should flow past the jet. This is a characteristic of nearly all modern types of carburetter, including the Zenith, Claudel-Hobson and other modern European types. It permits the use of a simple choker, which may or may not be as effective as a starting jet, but is certainly far cheaper to produce. By being non-adjustable, except as regards the slow running jet, it guarantees that the cars will always be run with reasonable efficiency and will not be ruined by flooding with rich mixture. This feature of non-adjustableness is so important that we are seriously considering locking or sealing the jet adjustments on our carburetters before cars are sold. MO/G Yours truly, M.{Mr Moon / Mr Moore} Olley | ||