Graph illustrating part-throttle fuel economy for a 4¼ Litre Bentley engine, comparing different carburettor systems.
| Identifier | ExFiles\Box 99\1\ scan0019 | |
| Date | 1st January 1933 guessed | |
| 4¼ LITRE BENTLEY PART THROTTLE FUEL ECONOMY S.34 COMP. RATIO 6.3 - 1 (E.W.1296) ① STD. WRAITH IGN. 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 Y-AXIS: PTS / BHP / HR X-AXIS: R.P.M IDEAL MIXTURE FOR 'ROAD LOAD' FULL THROTTLE WEAKEST MAINTAINED CONS. | ||
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).