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).
Features and performance improvements of the Winfield Carburetter.
| Identifier | ExFiles\Box 146\3\ scan0261 | |
| Date | 21th December 1936 | |
| 1245 W/P. Sr. from Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} Rm{William Robotham - Chief Engineer}/CTS{C. Trot Salt - Carburation}8/R.21.12.36. THE WINFIELD CARBURETTER. With reference to the memo from Paris - Sr.22/Dn.16.12.36. in which a customer has fitted one of these carburetters to his Phantom I, it is assumed, of course, that an "updraft" type of carburetter has been fitted to this car. The improvement in slow running can be attributed to better atomisation when feeding from the throttle edge. The improved get away is doubtless due to the accelerator pump. Our reports show that 10 years ago we were experiencing "a lag in the action of the petrol from the high speed jet ...... If the acceleration really has been improved, it is due to the larger effective choke area, and one would expect the maximum speed of this car to have been increased by about 5 m.p.h. With reference to the carburetter itself, it has two interesting features. - (1) The fully streamlined throttle. It is only so however at full throttle, and a customer uses part throttle positions 90% of the time he drives the car. (2) The accelerator pump. The working of this part is very similar to the S.U. petrol pump used on our present cars. In this case, however, the movement of the diaphragm is caused by variation of the induction pipe depression, in consequence of throttle movement. Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} | ||