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 from Bentley single-cylinder engine tests, charting detonation and BMEP against RPM for a twin-inlet high-power head.
| Identifier | ExFiles\Box 134\2\ scan0029 | |
| Date | 23th April 1957 guessed | |
| V1750. BENTLEY SINGLE CYLINDER TESTS SHEET 7. DETONATION TESTS. TWIN INLET HIGH POWER HEAD HIGH POWER CYLINDER HEAD TO L & C 4123/57 TWO INLET VALVES | .225 DIA. EXHAUST VALVE | .500 DIA. ZENITH CARBURETTOR (36 m/m CHOKE) SILENCER FITTED FUEL = N.1 SHELL VALVE TIMING: I.O. 2°E.{Mr Elliott - Chief Engineer} | I.C. 28°L. E.O. 51°E.{Mr Elliott - Chief Engineer} | E.C. 7°L. B.M.E.P. (SODIUM COOLED EXH. VALVE) NORMAL GASKET (CR{Mr Cra???ster / Mr Chichester} = 6.13) " " (CR{Mr Cra???ster / Mr Chichester} = 6.8) THINNER GASKET (CR{Mr Cra???ster / Mr Chichester} = 6.5) B.M.E.P. (NORMAL EXH. VALVE) CR{Mr Cra???ster / Mr Chichester} = 6.13 STD. BENTLEY (CR{Mr Cra???ster / Mr Chichester} = 6.4) B.M.E.P DETONATIONS IGNITION ADVANCE DETONATION (H.P. HEAD) NORMAL EXH. VALVE IGNITION ADV. H.P. HEAD NORMAL EXH. VALVE DETONATIONS. H.P. HEAD. AUDIBLE RANGE OF DETONATION (FEET) B.M.E.P. (LBS/SQ. IN.) NECESSARY IGNITION ADVANCE (FLYWHEEL) RPM G.W.P. | ||