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 of part throttle fuel economy for a 4 1/4 Litre Bentley engine.
| Identifier | ExFiles\Box 112\1\ scan0009 | |
| Date | 1st September 1940 guessed | |
| 4 1/4 LITRE BENTLEY PART THROTTLE FUEL ECONOMY S.35 COMP. RATIO 6.3:1 (E.W. 1296) INDN. PIPE E.B.3477-8 2. H.4. S.U. CARBS. ① IDEAL MIXTURE FOR 'ROAD LOAD' ② ACTUAL MIXTURE THROTTLING BACK FROM FULL THROTTLE W.M. SETTING (NO RESTN) (a) 1.000 BALANCE HOLE (b) .500 " " (c) .375 " " PTS/BHP./HR. R.P.M. FULL THROTTLE WEAKEST MAINTAINED CONS. | ||