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 consumption tests on a Bentley chassis after fitting a larger oil pump.
| Identifier | ExFiles\Box 131\2\ scan0020 | |
| Date | 17th August 1937 | |
| To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/GWH.{George W. Hancock - Head Chateauroux} Kingsbury August 17th 1937 1113 BENTLEY CHASSIS. Re. Introduction of Larger Oil Pump. With reference to your memo By.3/G.13.8.37. it is evident that the whole facts of the case relating to the Duke of Kent's car and the results were not clear to you. The position was as follows:- The car 142.H.K. mileage 4524 came into the Depot for a complaint of low oil consumption 600 M.P.G. The Depot dealt with it as follows:- (1) Cylinder head removed, valves ground in, carbon removed, valves replaced and new grummets fitted. (This is a routine job.) (2) Cylinder bores measured in position. Considered wear not sufficient for re-bore but new rings to be fitted. (3) Cylinder block removed and new rings lapped in. (4) Cylinder block refitted and engine built up. (5) Job completed and test of 100 miles for oil consumption. (6) Off test. Oil consumption 1600 M.P.G. The car was then ready for despatch but as a supply of large oil pumps came in, it was decided to conform to the instructions to fit a large oil pump. (7) The small pump was taken off and a large one fitted. (8) The car was sent out for a further 100 miles oil consumption test. (9) Result 260 M.P.G. 1st test. Sent out again 270 M.P.G. 2nd. test. Oil pressure increase throughout the range was 5 lbs. Idling from 5 to 10 lbs. 80 M.P.H. from 28 to 33 lbs. (10) I gave instructions to refit small pump. (11) Car sent out again for oil con. 1600 M.P.G. The car had to leave as it was over due. continued | ||