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).
Letter to C.H. Brooks of The Light Production Co. Ltd. regarding the performance and testing of piston rings.
| Identifier | ExFiles\Box 87\2\ scan0164 | |
| Date | 27th March 1936 | |
| x236 Exptl. Dept. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}8/KW. 27th March, 1936. C.H. Brooks Esq., The Light Production Co.Ltd., 60/66, Rochester Row, Westminster, LONDON, S.W.1. Dear Brooks, Many thanks for the piston rings. Our service people want a ring which will bed itself in reasonably quickly so that when they change rings on customers' cars, where there have been complaints of overoiling, they will get some immediate results. I appreciate that if a ring beds itself in quickly it may tend to increase the gap, but possibly you could legislate for this by making the depth of the surface affected by the turning very small and the ring material hard. If you could let me have a few dozens of these rings, I would run a check test here and then hand them over to our service people to see how they go on. To indicate to you how long it takes the existing rings to bed down, I give you the oil consumption figures for two of our cars which are at present running endurance. You will see that the oil consumption improves on successive days until from being very bad to start with it becomes quite passable. Yours sincerely, | ||