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).
Issues with valve bounce, spring surge, and engine idling, with proposed solutions and actions.
| Identifier | ExFiles\Box 124\2\ scan0329 | |
| Date | 16th July 1941 | |
| 1098 To Jnr.{Charles L. Jenner} from Rm.{William Robotham - Chief Engineer} Copy to Rm{William Robotham - Chief Engineer}/TAS.{T. Allan Swinden} VALVE BOUNCE AND VALVE SPRING SURGE B.60 AND B.80. ------------------------- I have read with interest your note and Rm{William Robotham - Chief Engineer}/TAS.{T. Allan Swinden}'s note of the 16th instant. The object of using the Halford tappet was to improve idling and not to cut down valve noise generally. We are making some progress on idling with smaller induction pipes, but should still like experience with the Halford tappet, particularly for large 4-cylinder engines, where poor idling will be very noticeable. We have really only instructed them for the 8-cylinder because we have permission to make a new engine and can work these various bits into the specification. The tubular rods are very attractive and we can certainly afford them on our sports aluminium engine. We should therefore like a design and will try and get some made. The valve spring surge on 9.B.V remains a mystery. The same camshaft without the spring drive on 3.B.50 does not surge. I think it must be a faulty camshaft. All the same we should like the existing springs to be designed with closed ends, to see if it reduces surge generally. Will you please design a set of dural push rods, and we will get them made. Rm.{William Robotham - Chief Engineer} | ||