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).
Power curve graph comparing the performance of different induction and exhaust systems on a Bentley III engine.
| Identifier | ExFiles\Box 108\2\ scan0206 | |
| Date | 16th January 1939 guessed | |
| INDUCTION SYSTEM COMPARISON BENTLEY III POWER COMP RATIO 6.6:1 CAMSHAFT F.B. 3466 TIMING @ .030 CLCE I.O 45° AT I.C. 47° AB E.O 38° BB E.C 3.5° AT RM{William Robotham - Chief Engineer} 522 PISTONS (170) ETHYL PETROL ① B II INDN. SYSTEM ② WRAITH INDN. SYSTEM ⓐ OPEN EXHAUST ⓑ SILENCED (B II SYSTEM COMPLETE) B.H.P B.M.E.P R.P.M. | ||