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).
The compression ratio and engine detonation of the 'ESSEX' car.
| Identifier | ExFiles\Box 124\3\ scan0127 | |
| Date | 19th October 1921 | |
| X3317 To R.{Sir Henry Royce} from E.{Mr Elliott - Chief Engineer} c. to Hs.{Lord Ernest Hives - Chair} E1/G19.10.21. X.3317 - RE "ESSEX" CAR. The compression ratio of the Essex engine is 4.95 to 1. The engine readily detonates although clean. E.{Mr Elliott - Chief Engineer} [Watermark text: COMMON BOND 1804 MADE AT CROXLEY] [Footer text, inverted: R.R. 2356 (100 T) (S.H. 728. 10-12-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2948] | ||