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 cause and modification of whistling carburetters and noisy brake levers on the 20 HP chassis.
| Identifier | ExFiles\Box 5\4\ 04-page103 | |
| Date | 10th June 1923 | |
| X4228 To EP.{G. Eric Platford - Chief Quality Engineer} from Hs.{Lord Ernest Hives - Chair} c. to BJ. c. to HY.{Tom Haldenby - Plant Engineer} c. to FH. c. to C. c. to Sg.{Arthur F. Sidgreaves - MD} Hs{Lord Ernest Hives - Chair}4/106.3.23. 20 HP. CHASSIS WHISTLING IN CARBURETTER. X4228 NOISY BRAKE LEVERS. X4257 As you are aware, the most frequent cause of the whistling on the 20 HP. carburetter is the annulus formed between the carburetter and the cylinder casting. You are also aware that this whistle does not occur on all cars, in fact, on only a small percentage of them. The reason it occurs on some cars and not others is because of the variation in the annulus allowed by the M limits on the drawing dimensions. As soon as this was proved several weeks ago, the limits on the drawing were altered so that there could not be any wide variation. No standardisation sheet was necessary for this because it comes under SY's permissible alterations to limits. We see no reason why chassis on test fitted with carburetters that whistle, should not be modified at once. The whistle caused by the low speed jet spindle is less frequent. If necessary, the present spindles fitted to the carburetters could be easily modified. The reason we have sent a standardisation sheet round for the new one, is to embody other improvements not connected with the whistling. We think that discrimination should be used as regards altering cars delivered. The carburetter either contd:- | ||