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).
Engine component endurance tests, covering the crankshaft damper, valve springs, dynamo, belt drive, and electrical system.
| Identifier | ExFiles\Box 124\1\ scan0128 | |
| Date | 22th May 1939 | |
| -5- (1) Crankshaft Damper - Cont'd.{John DeLooze - Company Secretary} When complete, a report will be given on the various dampers now being tested. We give, however, the above figures as a matter of interest in respect of the following. The Attwater fabric camwheel completed the full endurance together with the previous development, making a total of 105 hrs. running without trouble, the inspection revealing no appreciable wear or cracks, although as previously stated, oscillations of 1° have been transmitted to it. In comparison, during the 50 hr. endurance on the B.60 engine two camwheels failed in that the teeth sheared off although the crankshaft oscillation never exceeded .8° amplitude. As yet, until further investigations have been made we cannot say whether this is due to the shorter crank on the 6-cylinder or some difference in camshaft oscillations. (2) Valve Springs. As stated in our memo Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}4/WH.16.5.39, we have found that Phantom III double valve springs on the inlet valves have proved the most satisfactory; however, several have broken during the 50 hr. run and have requested for the modified double springs with the anti-surge close coils at the base to be used. (3) Dynamo. The front dynamo bearing developed very noisy. (4) Belt Drive. The single belt used for the auxiliary drives had stretched almost to the limit of its adjustment. (5) Electrical. During the run the distributor condensor failed. | ||