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).
Comparison of R.R. and Solex carburettor performance during hill climb tests.
| Identifier | ExFiles\Box 121\2\ scan0098 | |
| Date | 7th February 1929 guessed | |
| -2a (b) Ticknall Hill. R.R. Solex. Cutout Cutout Cutout Cutout closed. open. closed. open. Start - 10 m.p.h. 10 m.p.h. 10 m.p.h. 10 m.p.h. Speed at gate - 30 * 30.5 * 33.5 * 34 * Finish - 52 * 53 * 55.5 * 59.5 * Time - 65.6 secs. 63.8 secs. 62 secs. 59.6 secs. (c) Pilstern Hill - cutout closed. R.R. Solex. M.P.H. M.P.H. Start - 10 10 Speed at Δ - 25 30 Min.speed - 16 21 Finish - 29 34 Time - 83 secs. 59.5 secs. The superiority of the Solex carb. is definitely apparent where power output is considered, most especially so at the lower speeds viz: the Pilstern Hill test which is essentially a low speed torque test, the maximum speed never being above 34 m.p.h. We have not attempted to give a max. car speed comparison, as the variables consequent upon testing the car on separate days (viz: wind resistance, road conditions etc.) will probably be in excess of any difference due to the carburetter change. contd :- | ||