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 from Zenith Carburetter Co. Ltd regarding modifications to the carburetter idle system.
| Identifier | ExFiles\Box 122\2\ scan0241 | |
| Date | 4th October 1937 | |
| The ZENITH CARBURETTER·CO·LTD HONEYPOT LANE, STANMORE, MIDDLESEX ADJOINING QUEENSBURY UNDERGROUND STATION CARS DRIVEN BY OUR STAFF ARE AT CUSTOMERS OWN RISK AND RESPONSIBILITY. TELEGRAMS: ZENICARBUR. PHONE. LONDON. CODE: A.B.C. 5TH EDITION. ALSO AT LYONS, PARIS, DETROIT, TURIN, BERLIN. TELEPHONE: WORDSWORTH 2213 4th October 1937. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Radclyffe W. A.{Mr Adams} Robotham Esq., Messrs. Rolls-Royce Ltd, DERBY Dear Mr. Robotham, I learn from Mr. Fisher that your Service Department intend to introduce a service modification to the 25 hp. Carburetters, which modification will take the form of feeding the idle system direct from the float chamber. I believe also that the same idea is to be tried out on the Phantom III Carburetter. The object of this letter is just to mention that we have tried many times to feed the idle system from the float chamber direct and so have other manufacturers, but the results have never been satisfactory. The idle system is feeding such a long way up the engine range that the variable adjustment of the slow running can have a very marked effect on petrol consumption. Therefore the whole metering system of the carburetter is upset if the idle jets are fed direct from the float chamber. P.T.O. | ||