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 output and B.M.E.P. graph for a 3 1/2 litre Bentley engine developed for competition work.
| Identifier | ExFiles\Box 90a\2\ Scan283 | |
| Date | 6th July 1934 | |
| 3 1/2 LITRE BENTLEY POWER OUTPUT DEVELOPMENT FOR COMPETITION WORK (ULSTER TT SEPT. 1934) UNIT 34 ① COMP. RATIO 7.35:1 EXH-37 1/2" R.{Sir Henry Royce} VALVE R.H.1248 + 1500D (S.V.) EX " F.N.325 (-200 + 965) CAMSHAFT H.S. 965 R TYPE VALVE INTAKE 1.9" (+52 RAD FOLLOWERS) AERO LITE PISTONS STD. INDUCTION SYSTEM ② AS IN ① WITH 7.94:1 & 750 RAD FOLLOWERS ③ AS IN ② " STD CAMSHAFT & FOLLOWERS ④ COMP RATIO 7.75:1 EXH-24" D.S. R.{Sir Henry Royce} VALVE R.H.2089 (+500 O.P.) EX " F.N.325 (-200 ") OTHERWISE AS ③ ⑤ PLUGS LODGE X.304 K.L.G. - 827 OIL CASTROL XXL PETROL 50% SHELL N.1 50% BENZOL AXES: B.H.P. B.M.E.P. R.P.M. GRAPH NOTES: OPEN EXHAUST GTS VALVE TIMING DIAGRAMS: Diagram A: TDC, 14°, EX., IN., 70°, 67°, 59°, BDC Diagram B: T.D.C, 9°, 18°, EX., IN., 59 1/2°, 48 1/2°, BDC Diagram C: T.D.C, 17 1/2°, 10°, EX., IN., 55 1/2°, 51°, BDC Diagram D: T.D.C, 7 1/2°, 35°, EX., IN., 48/085 IN, 49 1/2°, 50°, BDC | ||