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).
Experimental trial of new lower stress valve springs for the Phantom III engine.
| Identifier | ExFiles\Box 96\2\ scan0187 | |
| Date | 11th December 1936 | |
| To BY.{R.W. Bailey - Chief Engineer} [crossed out] Copy to Rm.{William Robotham - Chief Engineer} Da.{Bernard Day - Chassis Design} HPS.{Horace Percy Smith - Experimental Factory Mgr} [crossed out] Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} E/PSN.2/MN.11.12.36. 354 Phantom III Valve Gear without Hydraulic Tappets. We send you herewith LeC.5417 of lower stress valve springs and washers suitable for use with all car engines. Will you please detail the parts necessary for trying these springs experimentally on Phantom III valve gear without hydraulic tappets. The scheme as drawn is for the adaptation of the new springs to existing engines and we shall shortly issue a final scheme of valve springs, wedges and top and bottom washers which will be suitable for all car engines. These springs are of reduced stress and should be tried in heat treated low carbon steel in addition to the standard material Will you please send a print of this s cheme to Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} in addition to the usual prints. E/PSN. Att:LeC.5417. | ||