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).
Production and testing of non-surging, closely coiled valve springs for Bentley and Phantom III models.
| Identifier | ExFiles\Box 88\4\ scan0197 | |
| Date | 25th January 1937 | |
| 254. To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}4/AP.25.1.37. VALVE SPRINGS. We should like to confirm the non-surging characteristics of the closely coiled valve springs RM.{William Robotham - Chief Engineer}260, as obtained on the Bentley unit. These particular springs were made in "Swedish Low Carbon wire" and coiled and finished by the Tempered Spring Co. As stated in our previous memo on valve springs, we should be able to save approximately 62% by buying the wire direct from Sweden and coiling our own springs. Will you therefore detail and instruct springs to Rm.{William Robotham - Chief Engineer}260 otherwise EB.175 to be made for our next 15,000 miles test (Bentley). LeC.5417 which you have detailed and instructed both in standard coil and closely coiled forms for the Phantom III, should, we think, be applicable to Bentley. Accordingly, will you please issue details for the Bentley valve guide and spring washers etc. to take the LeC.5417 springs. We can then run both Rm.{William Robotham - Chief Engineer}260 and closely coiled LeC.5417 springs together in the next 15,000 miles test. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||