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).
Disadvantages of running cars at a low temperature of 60° with thermostatically operated shutters.
| Identifier | ExFiles\Box 39\4\ Scan216 | |
| Date | 5th January 1931 | |
| Hs.{Lord Ernest Hives - Chair} Mr. SHOP. from Mx.{John H Maddocks - Chief Proving Officer} X3499 Mx{John H Maddocks - Chief Proving Officer}17/T5.1.31. re Thermostatically Operated Shutters. Reference Hs{Lord Ernest Hives - Chair}/Rml/MJ20.11.30 The information you asked for has taken some little time to get as we have little or no experience of running cars at so low a temperature as 60° we invariably run on the recommended water temperature of 70° to 90°. We find certain disadvantages running at 60° firstly the low speed jet has to be strengthened approximately 3 to 4 notches. With this setting when conditions cause higher temperatures the carburation is much too strong and the exhaust fumes are very pungent. There is also a marked tendency to "load up". Even with the jets set to suit a temperature of 60° acceleration is not good. We have not made any specific tests of the effect on petrol consumption, but it is certain to be high with the increased low speed jet aperture. [STAMP: RECEIVED 5 JAN 1931 HS{Lord Ernest Hives - Chair}] [SIGNATURE: Mx{John H Maddocks - Chief Proving Officer} NP] | ||