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).
Oil temperature test results over 7 laps comparing different bottom half materials.
| Identifier | ExFiles\Box 108\3\ scan0095 | |
| Date | 25th April 1939 | |
| -2- Oil temperature tests were obtained by running each car for 7 consecutive laps at full throttle in top gear and recording the figures each lap as follows :- 28.G.VI. 29.G.VI. Tin Bottom Half. Air temp. water. Oil temp. Air temp. water. Oil temp. 1st. lap 12.5°C. 81°C. 80°C. 12.5°C. 76°C. 82°C. 2nd. lap 12.5°C. 82°C. 91°C. 12.5°C. 76°C. 92°C. 3rd. lap 12.5°C. 83°C. 97°C. 12.5°C. 77°C. 101°C. 4th. lap 12.5°C. 83°C. 102°C. 12.5°C. 77°C. 105°C. 5th. lap 12.5°C. 83°C. 105°C. 12.5°C. 77°C. 108°C. 6th. lap 12.5°C. 83°C. 108°C. 12.5°C. 77°C. 110°C. 7th. lap 12.5°C. 83°C. 109°C. 12.5°C. 77°C. 112°C. ALUMINIUM BOTTOM HALF. 1st. lap 15°C. 81°C. 90°C. 15°C. 78°C. 82°C. 2nd. lap 15°C. 83°C. 96°C. 15°C. 78°C. 92°C. 3rd. lap 15°C. 83°C. 102°C. 15°C. 78°C. 102°C. 4th. lap 15°C. 83°C. 105°C. 15°C. 78°C. 108°C. 5th. lap 15°C. 83°C. 108°C. 15°C. 78°C. 110°C. 6th. lap 15°C. 84°C. 109°C. 15°C. 78°C. 124°C. 7th. lap 15°C. 84°C. 110°C. 15°C. 78°C. 130°C. The difference in temperatures between the Tin and Aluminium bottom halves, looks rather startling as also does the difference between 28.G.VI. and 29.G.VI with common bottom halves, and we should like to confirm these figures before they are accepted as facts. Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} | ||