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).
Programme of test bed work for O.H.C. B.23 and B.17 units, detailing investigations on exhaust systems and oil pumps.
| Identifier | ExFiles\Box 155\2\ scan0067 | |
| Date | 23th March 1937 | |
| To Rm. {William Robotham - Chief Engineer} from Rm {William Robotham - Chief Engineer} /Swdl. {Len H. Swindell} c. to Rm {William Robotham - Chief Engineer} /Mths. {Reg Matthews} c. to Rm {William Robotham - Chief Engineer} /CTS. {C. Trot Salt - Carburation} 1315. Rm {William Robotham - Chief Engineer} /Swdl. {Len H. Swindell} 11/AP.23.3.37. PROGRAMME OF TEST BED WORK. Further to memo Rm {William Robotham - Chief Engineer} /Swdl. {Len H. Swindell} 10/AP.16.3.37. No.30 Bed. O.H.C. B.23.Unit. Continue with tests as previous memo with following additional tests. Investigation of high drop in power with the Bent-ley exhaust system on this unit. Is the back pressure and loss of power pro rata with that of a standard engine.? Does the duration of the exhaust cam as varied by the tappet clearance affect the loss.? B.17 Unit. Assembled with the same A.C.6.S. main bearings and A.C.5.S. big ends as did the endurance run of 20 hours when previously on the test bed. The following oil pump figures to be taken before the endurance is continued. Oil pressures at 4000 R.P.M. with and without external tecalemit filter at oil inlet temperatures of 100°C, 110°C, 120°C, 130°C. After running at 130°C. check the speed and pressure at which oil feeds the timing gears also the rockers and give idling pressure and speed. Above taken with:- (a) Old standard small straight gear pump with standard spring and washers. (b) Standardised large capacity helical pump gear and its spring also with stronger spring Ex.26773 as handed to F.Potts. continued | ||