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 comparing engine performance characteristics for two different compression ratios.
| Identifier | ExFiles\Box 13\3\ 03-page370 | |
| Date | 2nd December 1931 | |
| COMPARISON OF COMPRESSION RATIOS R.M.P.44 2/12/31 114° CAMSHAFT E.82448 OPEN EXHAUST MANIFOLD ONLY STD VALVES 1.9 VALVE THROAT STD ROCKERS SINGLE S.U. CARB PIPE EX 7188 SKETCH 5 COMP. RATIO 5.22-1 COMP. RATIO 4.65-1 B.H.P. B.M.E.P. INDUCTION DEPN INS HG RPM ROAD SPEED M.P.H. 14x52 AXLE Left Circle: EX, IN, 020 CLCE, 54.4, 50.3, 3.7, 10.4 Right Circle: EX, IN, 013 CLCE, 60.5, 55, 1, 15 | ||