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).
Engine oil temperature control, lubrication properties, and the effects of filters on oil life and mileage.
| Identifier | ExFiles\Box 141\2\ scan0152 | |
| Date | 31th May 1936 guessed | |
| 8. (d) Keeping the main body of the oil at moderate temperature is important to insure a good temperature gradient to the oil without transfer of a destructive amount of heat. (e) Much more should be known about the effect of temperature and pressure on oil as a lubricant, while it has largely been studied only as a viscous fluid medium suitable for prying apart adjacent metal surfaces. It is probably safe to predict for the automobile, larger oil storage reservoirs in the crankcase or outside it, with thermostatic control of the volume of oil in circulation in the engine. By this means a uniform temperature of oil to the bearings may be maintained at all seasons and for all duration periods of continuous driving and at any driving speeds. Until the chemist gives us the indestructible oil of changeless viscosity, there are few more important factors for the automobile engine than maintaining "oil in" temperature uniform. The type of temperature control selected will govern the increase of volume of oil in use over present practice. With an oil cooler, less increase will be required than with cooling by contact with the walls of the storage reservoir. It is possible to maintain present day oil economy for a majority of cars, by including in the system, the type of filter which removes acid impurities as well as non-filterable material, and with oil kept in better condition increase the mileage between draining periods. In conclusion it is desired to express the author's gratitude to Mr. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} C. Brown of the Passenger Car Activity Committee for his untiring efforts in procuring the engine data which made this paper possible. Reference 1. Causes and Effects of Sludge Formation in Motor Oils by Barnard, Barnard, Rogers, Shoemaker and Wilkin S.A.E. Transactions 1934. NOTE: Figs. 1, 2, 4, 6 - 11, 18, 19, 22, 23, are not included with this mimeographed copy. | ||