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 engine B.HP and M.E.P. against R.P.M. with corresponding valve timing diagrams for three different camshafts.
| Identifier | Morton\M19\ img285 | |
| Date | 20th July 1931 | |
| B.H.P. 110 90 70 50 30 R.P.M. 500 1000 1500 2000 2500 3000 3500 M.E.P lbs/sq in 110 90 70 TIMING WITH .013 TAPPET CLEARANCE A TDC I.O. 26° 23° E.C. I.C. 66° 67° E.O. B.D.C. VALVE LIFT .492 CAM .3755 B TDC I.O. 3-7° E.C. I.C. 62.5° 65° E.O. B.D.C. VALVE LIFT .469 CAM .358 C TDC I.O. 10° E.C. I.C. 52° 50.5° E.O. B.D.C. VALVE LIFT .429 CAM .3246 ASB 20-7-31 | ||