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).
Investigation into the causes of valve rotation, erosion, and bounce in engines.
| Identifier | ExFiles\Box 42\3\ Scan064 | |
| Date | 17th December 1926 guessed | |
| contd :- -3- the studs and found that they also rotated in a similar manner and in the same direction as the valves. It occurred to us that this may have some connection with the valve erosion which sometimes occurs on engines. Seeing that loose washers followed the same motion as the valves it rather indicates that the motion is independent of the valve springs. It has occurred to us that this circular motion could result from similar rectilinear vibrations with components acting at right angles, the resultant being a circular vibration. The valve, due to its inertia and clearance in the guide, could then roll round inside the guide only by virtue of what we may express as 'epicyclic motion' obtain the rotary movement observed. The above is not put forward as a proved explanation of valve erosion but we think may be worthy of experimental investigation when some of the more vital questions have been solved. Returning to the question of valve bounce, we see from the experiments that no appreciable influence is exerted by the type of induction system employed - three cyl. or six. We are however continuing investigation as to why the inlet valves behave differently to the exhaust in order that information will be available to combat the spring breakage which seems to be the only resultant evil of valve bounce as we experience it. Hs{Lord Ernest Hives - Chair}/A.C.Lovesey | ||