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).
Request for assistance with valve spring failures on a new 12-cylinder car.
| Identifier | ExFiles\Box 158\4\ scan0059 | |
| Date | 18th September 1936 | |
| X1360 Exptl. Dept. Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls}7/KW. 18th September, 1936. Messrs. Barnes-Gibson-Raymond, Inc., 6400 Miller Avenue, Detroit, Michigan, U.S.A. For the attention of Mr. Zimmerli. Dear Sirs, We are having a certain amount of trouble with the valve springs on our new 12-cylinder car. We wonder whether you could give us any help towards solving the problem of valve spring failures. We are sending you a design drawing, LeC.4124, showing the poundage we require to stop the valves bouncing, in conjunction with the G.M. type hydraulic tappets. The drawing also shows the available space for any other type of valve spring. We should be grateful if you would send us, say, two sets of valve springs for test. These could be to our drawing, if you agree with the design of the springs we now use, or to your own design if you think the stresses we use are the cause of the failures. When Mr. Robotham was over in the States in 1934, you made for him some valve springs to overcome the constant failures he was having with the springs made in England. If you have any record of what these springs were, we should be very glad also to have a further couple of sets for test. The car in question was a 3 1/2 litre Bentley. Yours faithfully, (S.H.Grylls) FOR ROLLS-ROYCE LIMITED. | ||