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).
Resume on fuel economy comparing experiences with Vauxhall Motors and outlining a 7-point development programme.
| Identifier | ExFiles\Box 147\5\ scan0130 | |
| Date | 8th July 1937 | |
| Rm{William Robotham - Chief Engineer}/CTS{C. Trot Salt - Carburation}11/R.8.7.37. FUEL ECONOMY. The following is a resume of the present position at Vauxhall Motors (Luton), compared with our own experiences to date, on the problem of petrol consumption. An attempt is made from the combined information, to outline a programme of development which will bring into line all the controlling factors, so that their relative functions are in correct relationship on a complete engine. For the purpose of this programme we are going to assume the following to be 7 controlling factors, and the work to be carried out on any one may be influenced by the results from any of the others. -------------------- (1) Petrol supply system to the carburetter. (2) Carburation. (3) Distribution. (4) Vavle Timing and overlap. (5) Ignition. (6) Combustion Chamber design. (7) Power lost to Exhaust Silencers. -------------------- Petrol Supply System to the carburetter. It is essential that the petrol supply system be kept as cool as possible. Pipes must, therefore, be kept away from the metal structure of the engine, and if possible to be in a forward position of the bonnet in the slip stream of the fan. Carburation. Vauxhall cars are fitted with Zenith carburetters. The essential difference between this type and the Stromberg, as fitted to our cars, is that the system of "economy" device (for part throttle economy) on the Zenith is to control the air supply to the main discharge tube, while on the Stromberg the petrol supply is controlled. | ||