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 single versus twin carburettor systems and their performance characteristics on a Phantom model.
| Identifier | ExFiles\Box 5\4\ 04-page229 | |
| Date | 24th December 1929 guessed | |
| -2- are, however, modifying this so as to get the low speed readings. Also the distribution was not good when using the two Claudels and we think considerable improvement can be made by taking the 'lead in' from the carburetters into the manifold at the inner ends (see sketch) as we have found this gave very good results in the case of the twin Solex Solex on the Phantom. With the single Stromberg the distribution was very good, therefore we think the advantage gained by the two carburetters over the single is a minimum in this case and that a still greater difference can be shown by the modification mentioned above. Another advantage we have found with the two carburetter system is more instant response on opening the throttle and better slow acceleration from low speeds. This appears to be due to the closeness of the carburetters to the ports, as we have found the nearer we can get the carburetters to the manifold the better, both for power and acceleration. These experiments show that the advantage lies with the two carburetter system and it does not appear that we could reproduce the same characteristic with a single carburetter. We have fitted up the twin Solex carburetter on the Phantom ll and have obtained some good results. A report on this will follow when the tests are completed. HW/ACL. | ||