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).
Comparing under-bonnet temperatures with fixed vs. thermostatically operated radiator shutters on B11 & BV cars.
| Identifier | ExFiles\Box 150\2\ scan0377 | |
| Date | 13th September 1941 | |
| To RM.{William Robotham - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} 1280 Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager}1/OH.13.9.41. UNDER BONNET TEMP. ON B11 & BV CARS. We have just taken a series of underbonnet temperatures and water temperatures on 9 B5 car, which is fitted with fixed radiator shutters, and B 60LS car fitted with Thermostatically operated shutters. It will be seen from the attached list of figures that the Thermostatically operated shutters stabilizes the underbonnet temperature at a figure of 7°c higher than that of the fixed shutters, i e:- 40°c as against 33°c. Previous tests on 9B5 have shown us that for correct carburation free from flat spots we require a minimum underbonnet temperature of 40°c. Rm{William Robotham - Chief Engineer}/Wym{G. Harold Whyman - Experimental Manager} | ||