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).
Performance graph comparing two different engine compression ratios.
| Identifier | ExFiles\Box 14\3\ Scan074 | |
| Date | 2nd December 1931 | |
| COMPARISON OF COMPRESSION RATIOS 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 Left Diagram: EX, IN, .020 CLCE, 3.7, 10.4, 54.4, 50.3 Right Diagram: EX, IN, .013 CLCE, 1, 15, 60.5, 55 COMP. RATIO 5.22-1 COMP. RATIO 4.65-1 B.H.P. B.M.E.P. INDUCTION DEPN INS. Hg R P M ROAD SPEED M.P.H. 14X52 AXLE | ||