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).
Graph showing valve lift against crank angle for inlet and exhaust valves around top dead centre.
| Identifier | ExFiles\Box 179\2\ img238 | |
| Date | 8th February 1929 guessed | |
| VALVE LIFT 0.150 0.125 0.100 0.075 0.050 0.025 T.D.C. INLET EXHAUST CLOSING CRANK ANGLE TDC 340 360 380 400 420 440 460 | ||