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 Hs. to E. regarding compression ratios for an aluminium engine with an anti-detonating head.
| Identifier | ExFiles\Box 65a\1\ scan0082 | |
| Date | 27th May 1927 | |
| To E.{Mr Elliott - Chief Engineer} from Hs.{Lord Ernest Hives - Chair} X7770 Hs{Lord Ernest Hives - Chair}2/LG27.5.27. EAC-7 - COMPRESSION RATIO. X790 On the aluminium engine with the anti detonating head, we are running with a compression ratio of 4.6 to 1. We recommend for general purpose cars we should use 4.5 to 1 compared with 4 to 1 on present engine. Hs.{Lord Ernest Hives - Chair} | ||