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 data comparison for E.A.C. Fixed Choke and Knave type carburetters, with a diagram of an air valve deflector alteration.
| Identifier | Morton\M20.3\ img010 | |
| Date | 29th May 1924 | |
| E.A.C. FIXED CHOKE TYPE CARBURETTER. R.P.M. | E.A.C. B.HP. | Knave. B.HP. 2000 | 90 | 96 1500 | 72 | 78 1000 | 49 | 54 750 | 39 | 42 600 | 31 | 34 ALTERATION TO DEFLECTOR ON AIR VALVE. .625 1.400 TUBE SWEATED ON TO DEFLECTER | ||