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 Phantom II engine B.M.E.P. curves with open exhaust and 4.6:1 compression ratio, comparing camshaft types.
| Identifier | ExFiles\Box 13\2\ 02-page082 | |
| Date | 5th June 1931 | |
| CURVE IA PH II B.M.E.P CURVES OPEN EXHAUST 4·6:1 COMP RATIO A.{Mr Adams} TWIN CARBS 1·3 DIA CHOKES (STD COMP. RATIO)(R TYPE 110° CAMSHAFT) B. " " " " " ( " " " ")( STD " ") A B LWS 5-6-31 | ||