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).
The results of an oil flow test on Bentley main bearings, comparing 'white metal' and 'Hall's Metal' types.
| Identifier | ExFiles\Box 115\3\ scan0169 | |
| Date | 11th January 1938 | |
| [Handwritten Notes] Swad? Mths{Reg Matthews} we should reproduce this test experimentally BY/Mtnl/N.11.1.38 Rm{William Robotham - Chief Engineer} [Typed Content] Rm.{William Robotham - Chief Engineer} [crossed out] RHC.{R. H. Coverley - Production Engineer} [crossed out] Hd{Mr Hayward/Mr Huddy} [crossed out] W/P. [crossed out] 1020 Re: Bentley Main Bearings - Oil Flow Test. --------------------------- We attach two photographs and a blueprint shewing the equipment being used by Kingsbury for testing the oil flow through the bearings. The times established are as follows:- Old type 3 1/2 litre with white metal, Time to pass 1 gallon of C.W. oil ( average temp: of engine case 40°C. ) Engine bearing in good condition... 18 to 20 minutes. Doubtful condition... 10 to 12 " Definately bad.... 7 to 8 " With Hall's Metal. Engine in good condition..... 9 to 10 minutes. Doubtful condition...... 5 to 6 " All thump cases...... 2 to 4 " Average over 10 cases of thump.... 3 mins. 16 sec. BY/Mtn. | ||