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 comparison graph for a 7.67 Litre Phantom II engine with an open exhaust, comparing different carburettor and camshaft configurations.
| Identifier | ExFiles\Box 92\2\ scan0177 | |
| Date | 3rd October 1933 | |
| 7.67 LITRE PHANTOM (2) POWER COMPARISONS (OPEN EXHAUST) OLD TYPE INDN. SYSTEM I.E. HORIZONTAL CARB WEIR MANIFOLD STD. 116° CAMSHAFT I.O. 13° PTDC E.O. 48° BBDC I.C. 45° PBDC. E.C. 3° PTDC. R.R. SEMI EXPANDING CARB 114° CAMSHAFT (E.82448) I.O. 3° PTDC E.O. 46° BBDC I.C. 53° PBDC E.C. 7° PTDC 5.25:1 COMP RATIO B.H.P. M.E.P. (LBS/SQ) R.P.M. LHS{Lord Herbert Scott} 3.10.33 | ||