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).
Blueprint detailing a modification to a cylinder head for S.S. Engines to achieve a 4.25 compression ratio.
| Identifier | ExFiles\Box 65a\3\ scan0080 | |
| Date | 16th July 1925 | |
| V688. MODIFICATION TO CYLINDER HEAD. COMP. RATIO = 4.25 (FOR S.S. ENGINES) FOR ALL OTHER DIMENSIONS SEE E78854 (2 SHEETS) THE SHAPE OF THE STANDARD HEAD IS SHEWN IN DOTTED LINE. SECTION BB SECTION AA{D. Abbot-Anderson} 1.425 RAD. .325 RAD. 1.075 1.975 (UNALTERED) 2.850 4.600 WJF / 16.7.25 | ||