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).
Investigation into a whistling carburetter on a Goshawk II engine.
| Identifier | ExFiles\Box 5\4\ 04-page092 | |
| Date | 5th February 1923 guessed | |
| X4228 Carburetter whistling on Goshawk II The most noticeable whistle is at approximately 'E' open throttle, increasing with engine speed. There is also a very slight whistling at very low engine speeds, i.e. throttle only just opening. The whistling is not caused by sharp edges or burrs in the carburetter body. Carburetter was dismantled and every sharp edge and burr taken off, with no improvement. Carb: whistles with air valve out, both jets and needles out, and finally with everything dismantled but the carburetter body itself. (This was done by placing the car (R59) on the bumper drums, after removing cams from same) and running the engine from the drums). This apparently indicated that it was the throttle itself that was causing the noise, although there was nothing apparent to the eye to cause it. A comparison was then made between the G.II. butterfly throttle, an old small type 60:60:1R. | ||