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).
Performance graph comparing three different carburettor systems on a 4¼ Litre Bentley engine, unit B14.
| Identifier | ExFiles\Box 85\4\ scan0184 | |
| Date | 1st October 1937 | |
| 4¼ LITRE BENTLEY - UNIT B14 COMPARISON OF CARBURETTER SYSTEMS FIG. III. INDUCTION SYSTEMS. 1. Two S.U. CARBS 1 7/8 BORE ON T.T. INDUCTION PIPE 2. Six AMAL CARBS 1 3/16 BORE AND NO INDUCTION PIPE. 3. Six S.U. CARBS. 1 3/8 BORE AND NO INDUCTION PIPE. CYLINDER HEAD:- HALL'S T.T. HEAD INLET VALVE 1.600"; EXHAUST VALVE 1.400". CYLINDER BLOCK:- CHROMIUM PLATED BORES. COMPRESSION RATIO:- 9:1 ; FUEL:- ESSO ETHYL; OPEN EXHAUST. -B.M.E.P- -B.H.P- R.P.M.- IED. 1.10.37 | ||