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).
Dynamometer graph comparing a high power head against a standard 3 1/2 litre Bentley engine.
| Identifier | ExFiles\Box 134\2\ scan0109 | |
| Date | 13th February 1937 | |
| BENTLEY S/C UNIT COMPARISON OF HIGH POWER HEAD LEC 4075 AND STD BENTLEY ON ELECTRIC DYNAMOMETERS FIG II ① HIGH POWER HEAD INLET VALVE 1.750" DIA ② STANDARD 3 1/2 LITRE BENTLEY INLET VALVE 1.400" DIA B.M.E.P. 130 120 110 100 90 80 70 B.H.P 22 20 18 16 14 12 10 8 6 R.P.M 1000 2000 3000 4000 J.L.E. 13-2-37 | ||