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 curves comparing different exhaust setups for an O.H.C. Bentley (B.23) engine.
| Identifier | ExFiles\Box 97\1\ scan0136 | |
| Date | 11th March 1938 guessed | |
| CURVES SHOWING COMPARISON BETWEEN :- 4 PORT MANIFOLD & SINGLE BENTLEY SILENCER. 3 PORT MANIFOLD & SINGLE BENTLEY SILENCER. O.H.C. BENTLEY (B.23.) L.B.8 PLUGS. ETHYL FUEL. NO AIR SILENCER. TAPPETS AT .006" VALVE TIMING WITH .020" CL'CE. I.O. 2° B.T. E.O. 43° B.B. I.C. 33° P.B. E.C. 12° P.T. 1 5/8" CARBS. 1 OPEN EXHAUST 2 4 PORT MANIFOLD WITH 1 BENTLEY EXHAUST SILENCER 3 3 PORT MANIFOLD WITH 1 BENTLEY EXHAUST SILENCER Diagram Labels: 4 Port To BENTLEY SILENCER 3 Port To BENTLEY SILENCER Graph Labels: B.H.P. B.M.E.P. B.M.E.P. LBS/□" R.P.M. Bottom Left Box: 20" BACK PRESS INS: MERCURY. 10" | ||