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).
Requesting modifications to a Bentley cylinder head for larger valves and an increased compression ratio.
| Identifier | ExFiles\Box 86\1\ scan0027 | |
| Date | 11th September 1933 | |
| X219. To RHC.{R. H. Coverley - Production Engineer} from Hs{Lord Ernest Hives - Chair}/CTS.{C. Trot Salt - Carburation} Hs{Lord Ernest Hives - Chair}/CTS.{C. Trot Salt - Carburation}4/KT.11.9.33. BENTLEY. CYLINDER HEAD (LARGE VALVES). We are sending XXXXXX into the shop a cylinder head which at the moment has valves with 30° seats. Will you please modify this head to Ex.11476 to take the larger inlet valves. The necessary parts Ex.11474/5 are now available. Also the compression ratio can be raised with advantage on this head. The face should be machined to leave .030 section of metal. Hs{Lord Ernest Hives - Chair}/CTS.{C. Trot Salt - Carburation} | ||