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 to manufacture two sets of sodium-filled exhaust valves for a Phantom III engine.
| Identifier | ExFiles\Box 96\2\ scan0174 | |
| Date | 4th December 1936 | |
| To HPS.{Horace Percy Smith - Experimental Factory Mgr} from Rm{William Robotham - Chief Engineer}/Swdl{Len H. Swindell} Y 354. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell}17/AP.4.12.36. PHANTOM III. Will you please make two sets of exhaust valves in KE.965 stellited, to the following specification, sodium filled,in an endeavour to reduce the valve expansion. 1. Valve head and overall length E.88447. 2. Valve stem dia. .3725" as E.87584. 3. Drill hole in stem .156 dia., this hole to be filled with sodium. 4. The plugging of the hole and the distance to which it is drilled up the stem as E.86289. 5. The valve guides to suit above valves are to E.87592. Rm{William Robotham - Chief Engineer}/Swdl.{Len H. Swindell} | ||