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).
From 'R' requesting an estimate of expected power gains for a 20 HP engine following proposed modifications.
| Identifier | ExFiles\Box 5a\5\ 05-page002 | |
| Date | 1st November 1926 | |
| To E.{Mr Elliott - Chief Engineer} To Hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} 4577 R9/M2.11.26. 20 HP. X.5770 XJ5771 X.5230 Several times we have started out to get more power from this engine by :- (1)..... Improved exhaust. (2)..... Slightly higher compression. (3)..... Greater volumetric efficiency. Will E.{Mr Elliott - Chief Engineer} make an estimate of what we should expect, and if we are not getting it, Derby say why? R.{Sir Henry Royce} | ||