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 The Tempered Spring Co. regarding the specifications and potential design improvements for two spring types.
| Identifier | ExFiles\Box 158\4\ scan0209 | |
| Date | 1st February 1938 | |
| 1360 Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}10/MH.{M. Huckerby} Experimental Dept. 1st. February 1938. The Tempered Spring Co., Burton Weir Works, Sheffield, 4. Dear Sirs, In reply to your 'phone query regarding the 2 lots of springs ordered in accordance with our letter of the 31st. there is approximately .100 from being choc-a-bloc on the springs EW.1428 but the others, Exs.313 we do not know definitely. You can soon check these up, however, from the following figures and would like your views as to whether with the space available we could improve on the design of this spring from a stress range point of view. EW.1428. The spring length in the valve closed position is 1.550 and the valve lift being .350, the length in the open position is therefore 1.200. Exs.313. The valve closed length is 1.625 and with the same .350 lift the valve open length is 1.275. The maximum speed of the camshaft on the engine for which we require these springs is 2250 R.P.M. Will you please | ||