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).
Dynamometer test results for the 20-EX model, investigating power loss from the carburetter air silencer and various exhaust system modifications.
| Identifier | ExFiles\Box 5a\5\ 05-page183 | |
| Date | 23th November 1931 | |
| COPY. X5771 23.11.31. -------- X.5771. X.5086. X.5230. 20-EX DYNAMOMETER TESTS. We give herewith results of test on the dynamometer the object of which was to determine the power lost in the carburetter air silencer. It will be recalled that removing the air silencer completely resulted in an increase of 2mph. in maximum speed on Brooklands track. From the attached tests an increase of 9 BHP. at 84 mph. is obtained by removing the air silencer completely. If all the inner tubes were removed (which procedure is suggested for Continental P.2. cars) an increase of 7 BHP. is obtained at the same speed. Further tests on the exhaust system were carried out. In these a straight through downtake pipe, a downtake pipe led into the front end of the port expansion box and a swan neck fish tail having 50% greater area than standard were tested. None of these appreciably affected the power output. Hs{Lord Ernest Hives - Chair}/Lid.{A. J. Lidsey} Print attached: | ||