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).
Rear axle temperature tests conducted on a Bentley B 86 BN.
| Identifier | ExFiles\Box 84\4\ scan0279 | |
| Date | 10th August 1937 guessed | |
| File 202 GRM REAR AXLE TEMPERATURE TESTS. TAKEN ON BENTLEY B 86 BN.{W.O. Bentley / Mr Barrington} The rear axle was plastered with wet asbestos & lagged with asbestos rope to retain the heat generated. The temperatures were recorded with a Negretti & Zambra thermometer fitted to the oil drain plug of the axle. Temperatures recorded on the first run only reached 88°C presumed to be due to the moisture in the asbestos. When this dried out & got hard, the temperatures started to rise, & were maintained over a considerable distance. After the 1st days running, "283 miles" the axle developed an overrun groan between 18 & 30 MPH. but has not since deteriorated further. The running consisted of hard driving at high speeds together with heavy clutch & gear-box use. The pinnion has been removed for inspection, this being done before each change of oil. The pinnion teeth shewed heavier bedding on some of the teeth than others, but the surface was smooth & in good condition. There being no signs of cutting in, or picking up, this condition remained good throughout. | ||