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).
Letter discussing the problem of explosions in the silencer and proposing a simple solution involving the throttle and carburetter.
| Identifier | ExFiles\Box 1\3\ B001_X 93-page07 | |
| Date | 3rd April 1912 | |
| R.R. 235a (1004) (PP 289 H 12.12) G 4687. COPY. X93 Le CanadelHenry Royce's French residence, 3rd April 1912. Mr Johnson and T. C. Re Explosions in Silencer. These have troubled us for some time, both in closing the throttle when running fast and also in running downhill with the engine as brake. Why we are more troubled than most people has been explained lately and several ways suggested of reducing the tendency. I now give give an extremely simple scheme which I think will end this trouble and avoid any need of trying the devices I have already suggested. The throttle is exposed to a nearly complete vacuum, i.e. pressure of 13 lbs. below the atmosphere, therefore a slight leak of a large throttle will allow quite a quantity of air to pass. This mostly passes the small jet as the large jet and extra air valve is closed. The arrangement shown provides a flat or conical face valve to close the extension of the small throat, which is easily done as there is very little difference of pressure in any part of the carburetter; should the throttle be very leaky a slight vacuum will occur in the carburetter body, the air valve will lift and allow | ||