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).
Modifications and speed trial results for a 25 HP car ordered by Lord Cholmondeley.
| Identifier | ExFiles\Box 181\M13\M13.2\ img018 | |
| Date | 14th November 1931 | |
| 'SPEED' file To R.{Sir Henry Royce} From Hs.{Lord Ernest Hives - Chair} c. to Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} Da.{Bernard Day - Chassis Design} c. to By.{R.W. Bailey - Chief Engineer} 25 HP. CARS. You will remember that some time ago Lord Cholmondeley ordered a 25 HP. car and asked expressly that this car should be capable of 75 M.P.H. The car supplied is the present standard 25 HP. with the following modifications :- Compression ratio increased to 5.6 Modified camshaft 112° (without high lift) Modified exhaust system. The car was recently tried on Brooklands and over the measured mile the speed was 71 to 72 M.P.H. The covered body fitted to this car was extremely light, the total weight of the car being 30 cwts. Hs.{Lord Ernest Hives - Chair} | ||