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).
Blueprint graph showing power curves from a Bentley single-cylinder engine test with valves timed for 4000 RPM.
| Identifier | ExFiles\Box 133\2\ scan0125 | |
| Date | 1st November 1934 guessed | |
| BENTLEY SINGLE CYLINDER TESTS SHEET 6 POWER CURVES WITH VALVES TIMED FOR 4000 RPM "CLOSE-CENTRES" HEAD (L.C. 4100) COMPRESSION RATIO : 6.35 INLET VALVE : 1.500 DIA., EXHAUST VALVE : 1.400 DIA. INLET PORT : 1.500 DIA., & VALVE GUIDE BOSS REMOVED. AEROLITE PISTON. ZENITH TRIPLE DIFFUSER CARBURETTOR (32% CHOKE) OPEN EXHAUST FUEL : DTD 224 NORMAL BENTLEY TIMING TIMED FOR MAX. POWER AT 4000 RPM TIMED WITH ZERO OVERLAP FOR MAX. POWER AT 4000 RPM. BRAKE HORSE POWER. R.P.M. B.M.E.P. (LB/SQ. IN.) | ||