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).
Test procedure for a Phantom vehicle to diagnose explosions in the silencer related to the carburetter and throttle settings.
| Identifier | ExFiles\Box 66\2\ scan0247 | |
| Date | 7th October 1926 guessed | |
| contd :- -2- We suggest that the following simpe test be carried out on your Phantom - which at present is free from this trouble. Disconnect the petrol feed pipe from the starting carburetter, the starting carb. can then be used as an adjustable air leak by varying the position of the control between closed and fully open. The car should be coasted down a fairly long hill with throttle slightly open. By varying the air leak the correct mixture to produce explosions will be easily found. With the throttle slightly open, explosions will be continuous and violent, with the throttle fully closed one or two explosions will be obtained after each throttle closing. If the throttle is not a good fit, explosions will be continuous. We agree that with a fully closed throttle one or two large explosions can take place, but we cannot recommend not allowing the throttle to close as a cure. Our experience is that if a car will crash occasionally in the silencer with the throttle closed, it will do so continuously when the throttle is slightly open. Hs.{Lord Ernest Hives - Chair} | ||