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).
Guidance on diagnosing and addressing vehicle overheating issues.
| Identifier | ExFiles\Box 131\5\ scan0069 | |
| Date | 26th April 1938 | |
| -2- RM{William Robotham - Chief Engineer}/Std.9/MR.26.4.38. as indicated in rm{William Robotham - Chief Engineer}/Std.G/AP.24.6.37, sheet (2) the water temperature is not likely toreach 100°C, the temperature for water loss to occur, until the atmospheric temperature is approx. 29°C. It must be realised that genuine over-heating (which means loss of water as steam or mixture of steam and water, and not the thermometer indicating 100°C), is not likely to be experienced on a Ph.lll car with correct type of radiator matrix unless - (a) the day is exceptionally hot (b) the car is idled for an unnecessarily long period. It should be impressed on owners that high water temperatures on Ph.lll cars under traffic conditions are unavoidable - if necessary one of the latest type production thermometers, reading to 105°C with red line at temperature for water loss, can be fitted to the car to enable the owner to see that he is safe. (The thermometer removed will probably be suitable for Wraith production stock.) If water loss due to traffic idling over-heating is definitely complained of and established, then and only then should a five blade high speed fan be fitted. RM{William Robotham - Chief Engineer}/Std. | ||