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 curve graph for a 4 1/4 Litre Bentley engine comparing two different induction systems.
| Identifier | ExFiles\Box 99\1\ scan0018 | |
| Date | 1st January 1933 | |
| 4 1/4 LITRE BENTLEY. POWER COMP. RATIO 6.3 : 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) H.P. B.M.E.P. R.P.M. S. 33 | ||