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 comparing power development for a 4¼ Litre Bentley engine with different induction system configurations.
| Identifier | ExFiles\Box 82\4\ scan0391 | |
| Date | 1st October 1936 guessed | |
| S.4 4¼ LITRE BENTLEY POWER DEVELOPMENT INDUCTION B.3 UNIT COMP. RATIO 9:1 Ex 20948 CAMSHAFT EB. 1085 (STD) ① 2. 1 7/8 S.U. CARBS ON 1 7/8 BORE PIPE ② & ③ AMAL - STRAIGHT ON TO THE PORTS ② THROTTLE BORE = 1.125 ③ " " = 1.187 B.H.P B.M.E.P R.P.M. CTS{C. Trot Salt - Carburation} | ||