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).
Bentley oil temperature tests to evaluate the front timing case as an oil cooler.
| Identifier | ExFiles\Box 179b\4\ img011 | |
| Date | 10th April 1933 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} C. Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} C. Z. Da.{Bernard Day - Chassis Design} C. Hy.{Tom Haldenby - Plant Engineer} Rly. ORIGINAL X451-3 Y4693 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}3/KT.10.4.33. BENTLEY OIL TEMPERATURE. In order to determine - (a) The value of the front timing case as an oil cooler. (b) The maximum oil temperature likely to be attained by the Bentley car we asked GWH.{George W. Hancock - Head Chateauroux} to carry out some tests for us, running with the radiator shutters fixed in the fully open position, and again under the same conditions but with the timing case insulated from the air by shredded asbestos. The following results were obtained:- Front timing case lagged :- Rad. shutters held open MPH. AIR. OIL. WATER. 60 14ºC 72ºC 50ºC 70 14ºC 78ºC 55ºC 80 14.5ºC 86ºC 56ºC Lagging removed :- 60 15ºC 72ºC 50ºC 70 15ºC 75ºC 52ºC 80 15ºC 81ºC 54ºC Run of 12 miles each test. It will be observed that the timing case is responsible for a drop of 4½ºC at 85ºC, and also that with an air temperature of 30ºC, the oil temp. is likely to reach 96ºC, at a speed of 80 m.p.h. This is no worse that the conditions experienced on the last Phantom which ran 10,000 miles in France. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||