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 performance of Ramp and Standard cylinder heads in Bentley single-cylinder tests.
| Identifier | ExFiles\Box 133\2\ scan0065 | |
| Date | 26th July 1934 guessed | |
| V1706 SHEET 1. BENTLEY SINGLE CYLINDER TESTS. COMPARISON OF PERFORMANCE OF RAMP & STANDARD CYLINDER HEADS AT THE SAME DEGREE OF DETONATION & COMPRESSION RATIO. NATURALLY ASPIRATED COMPRESSION RATIO = 6.4 FUEL = N°1 SHELL SILENCED EXHAUST TO DETECT DETONATION. VALVE TIMING (.020" CLEARANCE): I.O. 4°E; I.C. 51°L; E.O. 51°E; E.C. 7°L. (STANDARD BENTLEY) TO BE EXAMINED IN CONJUNCTION WITH SHEETS N°s 2 & 3. Left Y-Axis: B.M.E.P. (LBS./SQ. IN) BRAKE HORSE POWER. Bottom X-Axis: RPM Right Y-Axis: POWER GAIN POWER LOSS SPECIFIC FUEL CONS.N (PTS/BHP/HR) Graph Data Labels: STD. HEAD MAX BMEP RAMP HEAD MAX BMEP BMEP OF RAMP HEAD AT SAME DEGREE OF DET.N AS STD. HEAD. POWER GAIN OR LOSS OF RAMP HEAD COMPARED WITH STANDARD, FOR SAME DEGREE OF DETONATION. STD. HEAD BHP BHP OF RAMP HEAD AT SAME DEGREE OF DET.N AS STD. SP.{Mr Spinney} FUEL CONS (RAMP) SP.{Mr Spinney} FUEL CONS (STD.) | ||