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).
Performance comparison report between a standard carburetter and a Solex carburetter, detailing acceleration and hill climb test results.
| Identifier | WestWitteringFiles\T\2January1929-June1929\ Scan102 | |
| Date | 7th February 1929 guessed | |
| contd :- -2- Either our carburetter uses an excessive amount of petrol during accelerations, or the Solex carb. is excessively strong at medium throttle positions. Starting from cold is very good, also indicating a rich mixture - the hot spot is very effective, it very quickly becomes hot. Suction noise is much more objectionable than in our own carburetter; no silencer of course is fitted. We have not been able to detect any detrimental effect due to centrifugal action upon the float chamber level when cornering sharply. The Solex people hope to improve upon this carb. as regards metering and low speed snap acceleration, and at the same time use 34 mm. chokes. Comparative tests were made as regards acceleration petrol consumption and our standard hill performance tests. The condition of the car with the exception of the carb. system was the same in each case. The conditions under which the car was tested were also as nearly identical as possible i.e., weather conditions. The results given are the average of six tests in each case. The mixture strength on the RR. carburetter was the standard setting - the weakest mixture for maximum power. (1) Standard performance tests. (a) Stanton Hill - cutout closed. Solex. RR. Start - 10 m.p.h. 10 m.p.h. Finish - 30 26 Time - 22.8 secs. 23.5 secs. contd :- | ||