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).
Summary of experiments to reduce oil temperature on a Paulin Bentley II model.
| Identifier | ExFiles\Box 160\4\ scan0038 | |
| Date | 13th March 1939 | |
| 1379, 1380, 1320 SECRET. To By. {R.W. Bailey - Chief Engineer} c. to Da. {Bernard Day - Chassis Design} c. to Da {Bernard Day - Chassis Design} /Ev. {Ivan Evernden - coachwork} RM {William Robotham - Chief Engineer} /TAT.9/JH.13.3.39. Paulin Bentley II. B.27.LE. Experiments carried out on Brooklands with a view to reducing oil temperature. ............ The attached sheet gives the oil temperatures attained under various conditions. Improvements were obtained by - a. {Mr Adams} the fitting of a scoop to the front undershield so designed as to collect air from as far forward as possible and direct it through a vent in the undershield on to the front of the sump. b. fitting a coiled pipe to the suction side of the oil pump in line with the vent in the undershield. c. reducing the water temperature. (test in conjunction with radiator test). Comparing tests 1 and 2 the scoop fitted to the undershield is worth 10°C for oil temperature reduction. Comparing tests 2 and 4 the coiled oil pipe gives a drop of 2°C. Test 5 run directly after test 4, checks back to conditions comparable with test 1, and gives a similar oil temperature. Test 3 indicates that a water temperature drop of 25°C. (i.e. 77°C. to 52°C) gives an oil temperature drop of 8°C. From tests on Montlhery it is known that any large vent in line with the sump at the front of the undershield gives a 10°C drop in oil temperature i.e. it is the same in effect as a scoop directing air through a small vent further back in the undershield. | ||