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 graph showing power loss to various exhaust systems for a 4 1/4 Litre Bentley engine.
| Identifier | ExFiles\Box 99\1\ scan0163 | |
| Date | 1st May 1938 | |
| 4 1/4 LITRE BENTLEY POWER LOSS TO EXHAUST SYSTEMS B.II N° 1 UNIT COMP. RATIO 6.3:1 (E.W. 1296) B II INDN. SYSTEM (2 H.4 CARBS) (500 RESN) 1) OPEN EXHAUST 2) EXPL. MANIFOLD ONLY 3) STD. MANIFOLD 4) 2. JAGUAR. SILENCERS ON 2 5) STD. B.II EXHAUST SYSTEM 6) 2 B I EXH. SYSTEMS ON 2 7) STD. B I UNIT WITH STD. BENTLEY SYSTEM 8) B I 7 BV MOCK UP SYSTEM REDLINE PETROL I.O. 3° AT I.C. 46° AB E.O. 36° BB E.C. 2° AT B.H.P. B.M.E.P. EX. BACK PRESS INS. HG. R.P.M. | ||