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).
Tests conducted on thermostats for 40/50 models, comparing different fillings and their effect on running temperatures.
| Identifier | WestWitteringFiles\U\August1930-November1930\ Scan140 | |
| Date | 22th October 1930 | |
| To R.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. Sg.{Arthur F. Sidgreaves - MD} c. Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} c. Da.{Bernard Day - Chassis Design} By.{R.W. Bailey - Chief Engineer} ORIGINAL THERMOSTATS. 40/50. We have conducted tests on thermostats filled with liquids having a lower vapour pressure than standard. The calorstat we consider would be most suitable is that marked B. This will give, as far as our tests have gone at present, an average running temperature of 72°C. The standard and one other filling we tried both give much a low running temperature that unless the atmospheric temperature falls below 5°C. they do not control the temperature of the radiator i.e. at 10°C. the car runs with no radiator shutters at about 63°C. Therefore, we can say that only this winter shall we appreciate the affect on carburation of running at 55°C. We believe that for reasonable fuel economy combined with the desired degree of acceleration, a running temperature of between 70 and 75°C. is about the minimum that can be employed. The disadvantage of thermostat B. is that should the shutter friction increase abnormally for any reason, a force of 50-55 lbs. only will be available to ensure that they open at 100°C. However, with the new design of X3499. | ||