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).
Letter discussing potential causes and solutions for a car overheating, such as mixture, ventilation, and ignition timing.
| Identifier | ExFiles\Box 11\3\ 03-page167 | |
| Date | 7th July 1930 | |
| G.W. Hancock, Esq., Hotel De France, Chateauroux, Indre, FRANCE. x7773 1766 To GWH.{George W. Hancock - Head Chateauroux} From Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson}2/MJ.7.7.30. With reference to your Daily Report of the 5th.inst. we are concerned about the overheating of the car. You do not say whether you had bonnet ventilation or not. We should like you to make sure that the mixture is on the over-rich side under high speed running conditions. On our Brooklands tests we have measured air intake temperatures as high as 50°C. with atmospheric temperatures of only 25°C. When everything under the bonnet is as hot as this we believe the mixture goes weak at full throttle openings, and we have proved that this can cause a rise in temperature of as much as 4.5°C. If you can get no change out of this we should like you to try removing the front under-shield. We should further like you to make certain that the ignition is not being retarded due to the high oil temperature and thus causing over-heating through the relay failing to function. We are anxiously waiting to hear the results of any alterations you may make to the fan drive. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||