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 curves of a B.18 Large Bore unit against a Standard Bore engine.
Identifier | ExFiles\Box 90\5\ scan0086 | |
Date | 23th September 1935 guessed | |
POWER COMPARISON. ① B.18 UNIT (LARGE BORE) 6.8 : 1 COMPRESSION RATIO. 1 5/8" DIA. CARBURETTERS & INDUCTION PIPE. 1.600 INLET VALVES. 1.400 EXHAUST VALVES. CYLINDER HEAD WITH POLISHED PORTS. ④ STANDARD BORE ENGINE 6.45 : 1 COMPRESSION RATIO. 1.400 INLET VALVES. 1.300 EXHAUST VALVES. Axis Labels: B.H.P., R.P.M. VALVE TIMING (.020 CLEARANCE) FOR CURVE ①: TDC INL: 4.7°, 47.7 EXH: 49.3, 3.3° FOR CURVE ④: TDC INL: 8.3°, 50° EXH: 50, 3.1° | ||