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 different high power head configurations at constant detonation.
| Identifier | ExFiles\Box 134\2\ scan0137 | |
| Date | 19th August 1937 | |
| HIGH POWER HEAD FIG. 4 POWER COMPARISON AT CONSTANT DETONATION. B.M.E.P. MAIN ENGINE B.H.P. R.P.M. ① STANDARD 3½ LITRE BENTLEY. C.R.=6.4. VALVE TIMING:- I.O. 4°E; I.C. 51°L; E.O. 51°E; E.C. 7°L. ② INCLINED VALVE HEAD AND DRY LINER BLOCK. VALVE TIMING:- I.O. T.D.C; I.C. 20°L; E.O. 35°E; E.C. T.D.C. EXHAUST VALVE. = 1.500" DIA: - C.R. = 6.3. ③ INCLINED VALVE HEAD AND CAST IRON BLOCK. VALVE TIMING:- I.O. T.D.C; I.C. 30°L; E.O. 35°E; E.C. T.D.C. EXHAUST VALVE = 1.600" DIA: - C.R. = 6.3. E.D. 19.8.37 | ||