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).
Development issues with carburation, exhaust, engine period, brakes, and electrical systems.
| Identifier | ExFiles\Box 179b\2\ img146 | |
| Date | 11th 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 carburettor and the departure of the car for France. The worst defect is a period of weakness from 30 to 35 M.P.H. It is only possible to get through this with a straight taper needle by having a very rich mixture at the top, apart from the poor high speed petrol distribution. 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 was still a matter of boom periods. However we think we shall have no difficulty in getting it right. (5) Engine Period. There is a roughness from 53-54 M.P.H. on top of 44 on third. It feels rather like a slight flywheel period. It can hardly be detected until the 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 C.V.S. considers that a fast headlight bulb are essential. We agree with this. Under these conditions there is a discharge of 5 amps at 60 M.P.H. | ||