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).
Modifying the choke valve controls to prevent overheating in six-cylinder engines.
| Identifier | ExFiles\Box 24\5\ Scan014 | |
| Date | 27th April 1925 | |
| H.R. 499A (50m) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: HS{Lord Ernest Hives - Chair}6/LG27.4.25. Therefore with the cars in which the choke valve is in the exhaust pipe for all six cylinders, the driver would use, under light throttle conditions, comparatively more throttle and therefore would give more heat to the water. In order to avoid this, it is necessary to arrange the controls for the valve in the exhaust pipe to allow the choke valve in the pipe to open very much more rapidly than the carburetter throttle. We are carrying out tests on the road and dynamometer in which the controls have been arranged temporarily in this way. In the meantime we suggest that the design is looked into to see what could be done to alter existing cars. This was written before we received CJ1/E27425. Further information in connection with this matter will be sent later. HS.{Lord Ernest Hives - Chair} | ||