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).
Test report detailing engine and radiator water temperature readings under various conditions, including with a spring fitted and removed.
| Identifier | ExFiles\Box 103\4\ scan0170 | |
| Date | 31th March 1936 guessed | |
| (3) 6. General conditions on road at about 30 m.p.h. Spring fitted. Air 18oC. WATER IN ENGINE WATER IN RADIATOR. 82oC. 74oC. 80 73 80 73 Average 80.6oC. 73.3oC. Engine thermometer in standard position at rear of block. Radiator thermometer as close as was possible to thermostat. The fluctuating reading - 92/90/93 of engine thermometer occurred at the same place on the home banking on every lap in the tests in which it is indicated. There was no immediate explanation. MAX. ENGINE TEMP. MAX. RADIATOR TEMP. DIFFERENCE. Spring removed 89oC 81oC 8oC. Spring fitted. 95oC 87oC 8oC. Increase due to spring in max. temperature, 6oC 6oC Increase in mean running temperature with empty header tank. 3oC 4.3oC Maximum engine temperature standing still 95oC. It will be observed that the quantity of water in the header tank made no important difference to the maximum or mean temperature 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 variation of temperature. With the spring removed the temperature rose until the shutters opened, then fell until they half closed, then rose again etc. | ||