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 showing the Indicated and Brake Powers for a 4¼ Litre Bentley engine.
| Identifier | ExFiles\Box 133\1\ scan0207 | |
| Date | 7th April 1937 guessed | |
| 4¼ LITRE BENTLEY INDICATED AND BRAKE POWERS FIG II C 73 INDUCTION SYSTEM :- TWO 1 S.U. CARBS. AND STANDARD INDUCTION PIPE. EXHAUST SYSTEM :- STANDARD TEST BED SILENCER. CYLINDER HEAD :- STANDARD 4¼ LITRE BENTLEY HEAD INLET VALVE 1.600" DIA. EXHAUST VALVE 1.400" DIA. COMPRESSION RATIO :- 6.5 : 1 FUEL :- P.T.D. 224. VALVE TIMING :- STANDARD BENTLEY WATER TEMPS :- INLET 78°C : OUTLET 85°C : OIL TEMPS :- INLET 80°C : INDICATED POWER 1. STRAIGHT MOTORING (—) 2. CUTTING OUT CYLINDERS (- - -) INDICATED POWERS BRAKE POWERS - B.M.E.P. - - B.H.P. - - R.P.M. - | ||