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 B.M.E.P. against R.P.M. for different high-power head configurations.
| Identifier | ExFiles\Box 134\2\ scan0125 | |
| Date | 1st July 1937 | |
| HIGH POWER HEAD - MAX. POWER ① INCLINED VALVE HEAD AND DRY LINER BLOCK VALVE TIMING:- I.O T.D.C.; I.C. 30° L; E.O. 35° E; E.C. T.D.C. C.R. = 6.3 EXHAUST VALVE = 1.500" DIA. ② 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. C.R. = 5.9 EXHAUST VALVE = 1.600" DIA. ③ STANDARD BENTLEY VALVE TIMING:- I.O 4° E; I.C. 51° L; E.O.L; E.O. 51° E; E.C. 7° L. C.R. = 5.4" ④ AS CURVE ② BUT WITH C.R. = 6.4 AXES: Y-AXIS: B.M.E.P. X-AXIS: R.P.M. | ||