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).
Power curves and valve timing diagrams for a Phantom II engine, comparing three different camshaft specifications.
| Identifier | ExFiles\Box 13\2\ 02-page127 | |
| Date | 6th August 1931 guessed | |
| P.II. POWER CURVES (ALL TAKEN OPEN EXHAUST) A R.{Sir Henry Royce} TYPE 110° SHAFT. TWIN CARBS 1.300 DIA CHOKES. STD COMP RATIO B. W.W. " 120° SHAFT. " " " " " C STD. 116° SHAFT. " " " " " B.H.P. R.P.M. M.E.P. lbs/sq in TIMING WITH .013 TAPPET CLEARANCE DIAGRAM A: I.O. TDC E.C. 26° 23° I.C. B.D.C. E.O. 66° 67° VALVE L... CAM... DIAGRAM B: I.O. TDC E.C. 3.7° I.C. B.D.C. E.O. 62.5° 65° VALVE LIFT .469 CAM 358 DIAGRAM C: I.O. TDC E.C. 10° I.C. B.D.C. E.O. 52° 50° VALVE LIFT .429 CAM .3246 | ||