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).
Material and design of exhaust valves for car and aero engines.
| Identifier | ExFiles\Box 6\7\ 07-page099 | |
| Date | 13th August 1930 | |
| Hs.{Lord Ernest Hives - Chair} } FROM R.{Sir Henry Royce} & E.{Mr Elliott - Chief Engineer} Rv. } C. Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} X5230 R1/M13.8.30. X.4011 X.4488 X.7230 X.5230 EXHAUST VALVES - CAR & AERO ENGINES. The new Austenitic steel I understand proved to scale (oxidise), whereas Silchrome was less inclined to do so. Therefore for ordinary work Silchrome was considered preferable. The shape, with slightly larger stem, (Schneider Trophy) however, in either steel is considered an improvement, and has been revised at WW. for "China" and "Japan" - LeC.2760 Nov.1929 - and I believe it was suggested by me to use this shape for all our engine work. Apparently P.2. 24-SX has not the best shaped valve - i.e. not increased clearance of the exhaust stream. This is the only move we know of and it is very urgently required. E.{Mr Elliott - Chief Engineer} is sending a design for P.2. engine in a post or two; this should be tested, and if better, adopted at once. No future trials should be made unless the parts are the best we know. R.{Sir Henry Royce} | ||