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).
Inquiry requesting details on compression ratio, horsepower, and performance gains after a test drive showed no disadvantages.
| Identifier | ExFiles\Box 88\2\ scan0069 | |
| Date | 26th November 1934 | |
| x420 To Hs.{Lord Ernest Hives - Chair} from Sg.{Arthur F. Sidgreaves - MD} Copy to Wor.{Arthur Wormald - General Works Manager}E. re 4-B-IV. Sg{Arthur F. Sidgreaves - MD}8/E26.11.34 Would you please let me know exactly what the compression ratio is and what extra HP and performance are obtained. In driving the car I could see no disadvantage, i.e. no detonation etc. Sg.{Arthur F. Sidgreaves - MD} | ||