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 comparing standard vs. larger valves on a 20 HP engine.
Identifier | ExFiles\Box 19\7\ Scan108 | |
Date | 31th March 1927 | |
20 H.P. POWER INCREASE DUE TO LARGER VALVES AND LOWER DEPRESSION IN THE INDUCTION PIPE. ENGINE No 11-GII COMPRESSION RATIO = 5.45 to 1. OPEN EXHAUST. CORRECTED TO N.T.P. 31-3-27 BRAKE HORSE POWER BRAKE MEAN EFFECTIVE PRESSURE (LBS / SQ") R.P.M OF ENGINE. B.H.P. B.M.E.P. LARGE VALVES (1.400 DIA) AND TWO ZENITH TRIPLE VENTURI HORIZONTAL CARBURRETORS. B.H.P. B.M.E.P. STANDARD VALVES (1.200 DIA) AND R.R. CARBURRETTOR. 3 | ||