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 of the inlet valve lift and piston displacement curve for a 20 HP engine.
| Identifier | ExFiles\Box 22\4\ Scan108 | |
| Date | 28th March 1927 | |
| 11 20 H.P. ROLLS-ROYCE ENGINE. INLET VALVE LIFT & PISTON DISPLACEMENT CURVE. STROKE = 4.50" (NO TAPPET CLEARANCE) 28-3-27 VALVE LIFT (INCHES). .30 .20 .10 0 POSITION OF CRANKSHAFT. (DEGREES). 320° 340° T.D.C. 20° 40° 60° 80° 100° 120° 140° 160° B.D.C. 200° 220° 240° 260° DISPLACEMENT OF PISTON FROM TOP OF STROKE (INCHES). 0 1 2 3 4 4 3 | ||