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).
Radiator tests conducted at Brooklands for Chassis No. 22 G.V., comparing temperatures with and without a spring fitted.
| Identifier | ExFiles\Box 155\1\ scan0198 | |
| Date | 31th March 1936 | |
| CHASSIS NO. 22 G.V. 31.3.36. Radiator Tests on Brooklands Continued. MAX. ENGINE TEMP. MAX. RADIATOR TEMP. DIFFERENCE. Spring removed. 89°c. 81°c. 8°c. Spring fitted. 95°c. 87°c. 8°c. Increase due to spring in max. temperature, 6°c. 6°c. Increase in mean running temperature with empty header tank. 3°c. 4.3°c. Maximum engine temperature standing still 95°c. It will be observed that the quantity of water in the header tank made no important difference to the maximum or mean temperatures or to the action of the shutters. The action of the shutters was much more steady with the spring fitted, very little movement being observed for small variations of temperature. With the spring removed the temperature rose until the shutters opened, then fell until they half closed, then rose again etc. While the spring is excellent for traffic and slow running generally, it is thought that the maximum of 95°c shown represents local boiling at some points on the head, and that the engine would boil the water under hot weather conditions if car was kept at full throttle, say, up a long hill. The rest of the running will be continued with the spring removed. The wind did not seem to have any direct effect on the shutters. | ||