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 comparing E.A.C. & Hispano inlet valve lift diagrams.
| Identifier | ExFiles\Box 180\M4\M4.2\ img015 | |
| Date | 25th February 1923 guessed | |
| E.A.C. & HISPANO VALVE LIFT DIAGMS. COMPARED. INLET VALVES. .50 .40 .30 .20 .10 CRANKSHAFT DEGREES. 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 220 230 BOTTOM CENTRE E.A.C. HISPANO E.A.C. REDUCED TO SAME LIFT AS HISPANO. | ||