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 detonation issues of an Essex car engine.
| Identifier | ExFiles\Box 180\M1\7\ img011 | |
| Date | 19th October 1921 | |
| To R.{Sir Henry Royce} from E.{Mr Elliott - Chief Engineer} Copy to HS.{Lord Ernest Hives - Chair} ORIGINAL El/G19/10/21. RE "ESSEX" CAR. (X8317) The compression ratio of the Essex engine is 4.95 to 1. The engine readily detonates although clean. E.{Mr Elliott - Chief Engineer} FO OCT 20 RECEIVED. | ||