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).
Modification to a cylinder head for S.S. Engines, changing the compression ratio to 4.25.
| Identifier | WestWitteringFiles\T\2July1929-December1929\ Scan014 | |
| Date | 7th July 1920 | |
| [ "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.", ".075", "1.975 (UNALTERED)", "2.850", "4.600", "7.7.20" ], | ||