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 the power output and I.B.M.E.P. of different induction and exhaust systems on a Bentley III engine.
| Identifier | ExFiles\Box 108\2\ scan0201 | |
| Date | 16th January 1939 guessed | |
| INDUCTION SYSTEM COMPARISON BENTLEY III POWER 'ETHYL' PETROL COMP. RATIO 6.6:1 CAMSHAFT E.W. 1416 TIMING @ .025 CLCE I.O. 67° AT E.O. 41.3° BB I.C. 39° AB E.C. 78° BT{Capt. J. S. Burt - Engineer} R.M. 522 PISTONS (170) ① B II INDN SYSTEM ② WRAITH INDN SYSTEM (a) OPEN EXHAUST (b) SILENCED (B1) SYSTEM COMPLETE B.H.P I.B.M.E.P R.P.M | ||