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 power and BMEP against RPM for short duration versus normal Bentley valve timings on a single cylinder engine.
Identifier | ExFiles\Box 134\2\ scan0028 | |
Date | 23th April 1957 guessed | |
V1749. BENTLEY SINGLE CYLINDER TESTS SHEET 6 POWER COMPARISON WITH SHORT DURn & NORMAL TIMINGS HIGH POWER CYLINDER & HEAD TO LEC 4075 SINGLE INLET VALVE 1.750" DIA EXHAUST VALVE 1.500" DIA COMPRESSION RATIO = 6.17 ZENITH CARBURETTOR (36mm CHOKE) OPEN EXHAUST FUEL = DTD 224 BRAKE HORSE POWER B.M.E.P. (LBS/SQ. IN.) R.P.M. SHORT DURn TIMING BENTLEY TIMING SHORT DURATION VALVE TIMING: I.O. 2°E; I.C. 28°L; E.O. 51°E; E.C. 7°L. NORMAL BENTLEY VALVE TIMING: I.O. 4°E; I.C. 51°L; E.O. 51°E; E.C. 7°L. | ||