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).
Technical report detailing development progress and issues with various vehicle systems.
| Identifier | ExFiles\Box 1\8\ B001_X100 Engine Chassis-page109 | |
| Date | 21th November 1932 | |
| -2- Cont'd.{John DeLooze - Company Secretary} (3) Carburation. It was possible to do little development work on this between the completion of the carburetter and the departure of the car for France. The worst defect is a period of weakness from 30 to 20 M.P.H. It is only possible to get through this with a straight taper needle by having a very much over rich mixture at the top, hence the poor high speed petrol consumption. Bench tests indicate that at these speeds the mixture tends to fall back after leaving the low speed choke and we are trying altered proportions. Also the distribution is susceptible to the throttle position. Every effort is being made to catch up with the development of this item, also to provide a satisfactory air intake silencer. (4) Exhaust System. This has still a number of boom periods. However we think we shall have no difficulty in getting it right. (5) Engine period. There is a roughness from 38-44 M.P.H. on top or 44 on third. It feels rather like a slight flywheel period. It can hardly be detected until the oil temperature reaches 90°C. Therefore it may disappear when the other trouble is rectified. (6) Brakes. These are in their original form. We believe there will be no difficulty in making them satisfactory. At present they stop the car but require a great deal of pedal pressure and fade when used very hard. The wear so far has been very good. (7) Electrical System. For driving at high speed in France O.W.H. considers that 60 watt headlight bulbs are essential. We agree with him. Under these conditions there is a discharge of 8 amps at 60 M.P.H. | ||