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).
Technical memo on thermostatically controlled shutters for the Phantom II in the U.S.A., discussing optimal water temperatures and modifications.
| Identifier | ExFiles\Box 39\4\ Scan217 | |
| Date | 7th January 1931 | |
| To R.{Sir Henry Royce} From Hs.{Lord Ernest Hives - Chair} c. to Ss.{S. Smith} Mor. c. to E.{Mr Elliott - Chief Engineer} Pa.{Mr Paterson} c. to Hy.{Tom Haldenby - Plant Engineer} X3499. Hs.{Lord Ernest Hives - Chair}1/MJ.7.1.31. x7250. x3499 THERMOSTATICALLY CONTROLLED SHUTTERS FOR PHANTOM II IN U.S.A. On 25-EX, car which I took to U.S.A. Springfield criticised the mean water temperature at which the car ran. On this car it was about 68°. It was one of the latest type thermostats. They say that they have been fitting thermostats for two or three years on their cars, and from their experience the best temperature for them to be set at is 75° to 80°. On their Phantom I cars they are still using the butterfly in the exhaust pipe. This, as we know, is very much more efficient than our present scheme at part throttle openings therefore it is more important that we should keep our water temperature up. On 25-EX. I added a spring to the thermostat, which raised the mean temperature up to 75° and the car was run most of the time under that condition. The Phantom II's with the hand controlled shutters tell us very definitely what is the best temperature to run the engine at and certainly on there one can prove that for very cold winter conditions, to obtain better results, the water does not drop below 75°. We recommend that for the left-hand cars at least, we add a spring in the thermostat so that the mean temperature is 75°. Hs.{Lord Ernest Hives - Chair} | ||