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 part throttle fuel economy for a 4¼ Litre Bentley engine with two different carburettor systems.
| Identifier | ExFiles\Box 112\1\ scan0011 | |
| Date | 1st September 1940 guessed | |
| 4¼ LITRE BENTLEY PART THROTTLE FUEL ECONOMY COMP. RATIO 6.8-1 (E.W. 1296) ① STD. WRAITH IDN. SYSTEM (SINGLE D.C. 42 STROMBERG) ② AS ① WITH SINGLE HORIZONTAL S.U. CARB. ACTUAL MIXTURE THROTTLING BACK FROM FULL THROTTLE W.M. SETTING. IDEAL MIXTURE FOR 'ROAD LOAD' FULL THROTTLE WEAKEST MAINTAINED CONS. Y-AXIS: BHP / HR X-AXIS: R.P.M. | ||