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).
Outlining proposed comparison tests for different induction systems on 6-cylinder engines.
| Identifier | ExFiles\Box 123\1\ scan0006 | |
| Date | 31th October 1939 | |
| 1036 d 1044 To Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} c. to Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} Rm.{William Robotham - Chief Engineer}3/JH.31.10.39. INDUCTION SYSTEMS. On the 6 cyl. cast iron engines we intend to have two types of induction system. (1) Rolls-Royce. This will be a duplex stromberg system as at present fitted to 1.B.50. (2) Bentley. This will be a two S.U. system as fitted to 3.B.50. When you have finished the comparison of the heads, and found the best ignition setting and best head on the cast iron unit for No.1 Fuel, a careful comparison should be carried out between 2.B.50. and 3.B.50 for consumption. The induction system should then be changed over on 3.B.50. to the double Stromberg and the test repeated. In every case, of course, the carbs. will be set as weak as possible for maximum performance. At the completion of these tests we shall then have (a) A comparison for economy between Alum and Cast Iron engines, both being fitted with S.U. Carbs. (b) A comparison for economy between two S.U.'s and a Duplex Stromberg, both being fitted to the high power engine. At the same time we should also like the performance value of these two types of carburetter, and their respective "idling" merits. The performance of each in turn will be compared with 2.B.50. Rm.{William Robotham - Chief Engineer} | ||