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 to the Zenith Carburetter Co. Ltd. regarding carburetter settings and desired modifications for a six-cylinder engine.
| Identifier | ExFiles\Box 122\3\ scan0163 | |
| Date | 23th August 1939 | |
| 1033 EXPERIMENTAL DEPARTMENT. Rm{William Robotham - Chief Engineer}/TAS.{T. Allan Swinden}3/JH. 23rd. August, 1939. The Zenith Carburetter Co.Ltd., Honeypot Lane, Stanmore, MIDDLESEX. For the attention of C.H.Fisher Esq. Dear Sirs, We have now arrived at what appears to be a satis-factory setting for the dual Stromberg carburetter on the six cylinder engine. This has been obtained on the AAV.26 model which we believe you described as a 1939 Cadillac type, with alteration only to the main metering and Economiser by-pass jets. We have no service bulletin for this model, hence the enclosed specification obtained on our carburetter may not all be strictly true, but should serve to indicate which model we are using. The two outstanding modifications which we should like making to the carburetter are :- (a) An electrically operated choke control to replace the exhaust heated unit. (b) An internal fast idle system to replace the external stepped cam mechanism. The difficulties we find in building up our ideal carburetter are :- (1) That the electric choke and the exhaust operated choke are offset in different directions. (2) That we have not seen a throttle body with internal fast idle and provision for drilling an economiser vacuum passage. | ||