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 graph comparing two competition specifications for a 3 1/2 Litre Bentley engine.
| Identifier | ExFiles\Box 90a\2\ Scan099 | |
| Date | 27th April 1936 | |
| 3 1/2 LITRE BENTLEY, SHELSLEY WALSH, HILL CLIMB CHASSIS No35 AE (ERHALL) POWER-OUTPUT B.I.I. UNIT COMPETITION WORK ① SPEC: RHC{R. H. Coverley - Production Engineer}/NSC4/FP{F. Potts}23/7.34 COMP. RATIO 7.75:1 (FB1237) IN. VALVE EX (2089) (1.500 DIA) EX " EB 325 (1.200 DIA) AEROLITE RACING PISTONS STD. CYL. BLOCK STD. CAMSHAFT EB 1085 (1.3°) ② SPEC: RHC{R. H. Coverley - Production Engineer} COMP. RATIO 9.2:1 (EX/5392) (COMB. CHAMBER MODS) (H31527) IN. VALVE EX15603 (1.500 DIA) (DIA OF HEAD REDUCED BY .050) EX. VALVE EX15604 (1.200 DIA) PISTONS CYL. BLOCK AS ① CAMSHAFT PETROL: 50% D.T.D 230 50% BENZOL OIL: CASTROL XL PLUGS K.L.G. BP7 ULSTER T.T. OPEN EXHAUST SHELSLEY WALSH Y-AXIS LEFT: B.H.P Y-AXIS RIGHT: B.M.E.P X-AXIS: R.P.M. DIAGRAM: T.D.C, B.D.C, 3.5°, 45°, 49.2°, 50°, (TAPPETS .020) C.T.S. 80 | ||