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).
Power and BMEP performance graph for a 4 1/4 Litre Bentley engine, comparing two induction systems.
| Identifier | ExFiles\Box 112\1\ scan0006 | |
| Date | 10th May 1938 guessed | |
| 4 1/4 LITRE BENTLEY. POWER. COMP. RATIO 6.8 : 1. (EW 1296) ① STD. WRAITH INDN. SYSTEM (SINGLE DC.42 STROMBERG) ② EX.27980 INDN. PIPE WITH DUPLEX CARB. (TYPE A.A. 25 DOWNDRAUGHT STROMBERG) S. 33 H.P. B.M.E.P. R.P.M. | ||