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 against engine RPM for two different induction systems on a 4 1/4 Litre Bentley.
| Identifier | ExFiles\Box 99\1\ scan0022 | |
| Date | 30th May 1938 guessed | |
| S 37 4 1/4 LITRE BENTLEY PART THROTTLE FUEL ECONOMY COMP RATIO 6.3 : 1 (E.W. 1296) T: STD. WRAITH INDN. SYSTEM (SINGLE O.C 42 STROMBERG) B: B II INDN. SYSTEM (2 W4 S.U. CARBS) IDEAL PART THROTTLE MIXTURE FOR 'ROAD LOAD' Y-AXIS: PTS/B.H.P/HR X-AXIS: R.P.M. | ||