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).
Cause and potential modification for whistling carburetters and noisy brake levers on the 20 HP chassis.
| Identifier | ExFiles\Box 5\3\ 03-page075 | |
| Date | 6th March 1923 | |
| To EP.{G. Eric Platford - Chief Quality Engineer} from Hs.{Lord Ernest Hives - Chair} X.4257. c. to BJ. c. to BY.{R.W. Bailey - Chief Engineer} c. to PN.{Mr Northey} c. to C. c. to Sg.{Arthur F. Sidgreaves - MD} Hs{Lord Ernest Hives - Chair}4/LG6.3.23. 20 HP. CHASSIS. WHISTLING IN CARBURETTER X.4228. NOISY BRAKE LEVERS X.4257. 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, only on 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 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 BY'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 whistles or does not whistle. To go round modifying all carburetters might do more harm than good. contd:- | ||