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 comparison chart for Ramp and Standard cylinder heads from Bentley single-cylinder tests, using anti-detonating fuel.
| Identifier | ExFiles\Box 133\2\ scan0069 | |
| Date | 26th July 1934 guessed | |
| SHEET 5 V1710 BENTLEY SINGLE CYLINDER TESTS. POWER COMPARISON OF RAMP & STANDARD CYL. HEADS (ANTI-DETONATING FUEL). NATURALLY ASPIRATED OPEN EXHAUST FUEL = DTD 224 COMPRESSION RATIO: RAMP = 6.59, STD. = 6.40 VALVE TIMING (.020 CLEARANCE): I.O. 4°E; I.C. 51°L; E.O. 51°E; E.C. 7°L. (STANDARD BENTLEY) INCREASE IN PEAK RPM IS APPROX. PROPORTIONAL TO INLET VALVE AREAS PEAK - RAMP PEAK - STD. RAMP HEAD STD. HEAD SP.{Mr Spinney} FUEL CONS. (RAMP) (STD.) Left Axis: BRAKE HORSE POWER Right Axis: B.M.E.P. (LBS/SQ. IN) Right Axis: SP.{Mr Spinney} FUEL CONS. (PTS/BHP/HR) Bottom Axis: R.P.M. | ||