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).
Valve lift diagram comparing a long duration camshaft to a standard camshaft.
| Identifier | ExFiles\Box 5a\5\ 05-page057 | |
| Date | 11th July 1927 | |
| LONG DURATION INLET VALVE LIFT DIAGRAM. The DOTTED CURVE REFERS TO STANDARD CAMSHAFTS. CRANKSHAFT MOVEMENT. 30°, 60°, 90°, 120°, 150°, 180°, 210°. FD{Frank Dodd - Bodies}/11.7.27 | ||