Camshaft stress on the B.60 engine and investigating hairpin valve springs as a solution.
| Identifier | ExFiles\Box 123\5\ scan0317 | |
| Date | 23th February 1939 | |
| 1044 Rm {William Robotham - Chief Engineer} /Swdl. {Len H. Swindell} from Rm. {William Robotham - Chief Engineer} Rm {William Robotham - Chief Engineer} 5/R.23.2.39. In view of the short duration of our B.60 Valve openings and the large valves we employ, the stresses on the camshaft are high. Furthermore, it appears from the road tests so far carried out that we may have to shorten the duration still more. I should be glad if you would get Spooner to go into the question of hairpin valve springs, as these are being employed with considerable success by several motor manufacturers. Their main advantage is that the spring has little or no inertia. At high speeds the inertia of the valve springs materially reduces the bouncing speed. I should be glad if you would contact Whyman regarding the tests he has done on idling on the B.60, and let me have your recommendations. Rm. {William Robotham - Chief Engineer} | ||
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).