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 an engine's BHP and BMEP using standard versus larger valves and different carburettors.
| Identifier | ExFiles\Box 22\4\ Scan122 | |
| 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 B.H.P. B.M.E.P. LARGE VALVES (1.400 DIA) AND TWO ZENITH TRIPLE VENTURI HORIZONTAL CARBURRETTORS. B.H.P. B.M.E.P. STANDARD VALVES (1.200 DIA) AND R.R. CARBURRETTOR. Left Y-Axis: BRAKE HORSE POWER Right Y-Axis: BRAKE MEAN EFFECTIVE PRESSURE (LBS / SQ") Bottom X-Axis: R.P.M. of ENGINE. Graph Values: Left Y-Axis: 10, 20, 30, 40, 50, 60, 70 Right Y-Axis: 80, 90, 100, 110, 120 Bottom X-Axis: 500, 1000, 1500, 2000, 2500, 3000 Top right corner: 3 (in a circle) | ||