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).
Responding to queries on Bentley chassis, discussing bearing materials and Hykro crankshaft performance.
Identifier | ExFiles\Box 83\3\ scan0060 | |
Date | 1st October 1937 | |
200. By.{R.W. Bailey - Chief Engineer} from Rm.{William Robotham - Chief Engineer} Rm{William Robotham - Chief Engineer}6/R.1.10.37. BENTLEY CHASSIS. By3/N.29.9.37. With regard to your queries:- (1) We have now had enough experience to know that in the case of hard drivers, such as Raymond Mays, it is better to fit AC.2 material right away when hammering out takes place. There are other cases, however, when a car will run 30,000 miles before sinkage starts, where taking up the bearings will give an extended period of life to the engine at a minimum cost. This appears to us to be a case where the Repair Dept. could, with advantage, use their own discretion. (2) Hykro Crankshafts. The recent test on the P.III Hall's Metal big-ends was run with a Hykro crankshaft. The shaft fitted to 6.B.IV, which is now ready for 15,000 miles, is also Hykro. We have several more fitted to experimental engines which have done little or no running as yet. We think we ought to do some more running before we actually standardise, because though scoring of the shaft looks very bad, it has not really been a contributory cause to bearing sinkage, or engine roughness, to any great extent, i.e., we are not really in trouble with the present shaft. Rm.{William Robotham - Chief Engineer} | ||