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).
Condition of various engine components and conclusions drawn from a test run.
| Identifier | ExFiles\Box 179b\3\ img090 | |
| Date | 31th January 1933 | |
| -3- He/L.B./M.31.1.33. Cont'd.{John DeLooze - Company Secretary} Top Joint Rings. No internal water leaks occurred during the run, and none appeared on testing the blocks. The rings appeared to be in very good condition, the bedding generally being good. 23 & 25 showed the most deterioration, but this was not bad enough to start any leakage. Hotwell Pump DES.1774-34. As the incorrect Morganite bearing material had been used, which caused scoring of the shafts, a true comparison cannot be made with the previous run, when white metal bearings were used. The pump gears, in the usual materials of stainless steel and bronze, had scored on the teeth, but there were no deep pits; their condition being similar to those after the previous run. Lightened Parts. Petrol Pump. The various glands, petroflex banjo and stop for relief valve, were in good condition. Camshaft Drive Guard Tubes. These are in Dural: and are strengthened to prevent collapse at the gland. They successfully completed the run, without any collapse. Conclusions from Run. Over the latest E.C. Type Test attempt is an improvement over the last, but emphasises the fact that white metal big end bearings when running with either a hard or soft shaft, will not stand up satisfactorily under moderately supercharged E.C. conditions. Lead Bronze main bearings have proved successful, and are a great advance on white metal. The .475 Maag gear, whilst not in perfect condition, is a big improvement on any previous gear of this ratio. Prior to the Type Test the gear ran 150 hrs. satisfactorily on 607 engine, which included 50 hrs. S.C. Type Test running at Godhawk II rating, the endurance power being 303 HP. The salt cooled exhaust valves were in better condition, as regards the seatings, than after the previous run. It has been agreed that the most probable cause of valve failure was sticking in the bronze guide. He/L.B.Hall. | ||