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 from Cadillac regarding the status of a '16' project, a LaSalle nose, and technical details on valve springs and cams.
| Identifier | ExFiles\Box 17\6\ Scan214 | |
| Date | 9th May 1934 | |
| CADILLAC MOTOR CAR COMPANY DETROIT, MICHIGAN CADILLAC and LASALLE MOTOR CARS May 9, 1934. Mr. W. A.{Mr Adams} Robotham, Rolls-Royce, Limited, Derby, England. Dear RM{William Robotham - Chief Engineer}: Your 16, they tell me, is nearly finished. We shall keep it over here a week or so till we can make a respectable automobile out of it. Your LaSalle nose went out April 16. I didn't see it. You ought to have it by now. If you complain about delay on the 16 you put yourself in a very difficult position because R.{Sir Henry Royce} R.{Sir Henry Royce} have probably keep customers waiting more than any other automobile company. Valve springs. All springs of 1/8" diameter and up are of Swedish 1065. Below 1/8" are of Halcomb 6150. GMC heat-treat specification 62M for the Chrome Vanadium and 64M for the Swedish Carbon, are enclosed. I think it is true to say that all such springs in this country are cold wound. Sources of supply - Cleveland Wire Spring Barnes Gibson Raymond L. A.{Mr Adams} Young Best authorities, I think, are Donkin and Clark formerly of Cleveland Wire, now of Eaton Manufacturing Company, Detroit. It is a feature on American Cars in which more advance has been made in the last few years, than in any other part of the car. The "surge proof" PI springs we sent over several years ago were developed by Donkin and Clark by trial using their sectioned testing machine which actually fits a single slab of the engine valve gear and lights it up with a stroboscope. I believe the R.{Sir Henry Royce} R.{Sir Henry Royce} cams were said at that time to be the most difficult they had ever tackled because there was so many different elements in the various stages of the cam that a Fourier an- | ||