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 showing detonation tests with a Ramp Cylinder Head, plotting BMEP and ignition advance against RPM.
| Identifier | ExFiles\Box 133\2\ scan0066 | |
| Date | 26th July 1934 guessed | |
| BENTLEY SINGLE CYLINDER TESTS. SHEET 2 2021 A DETONATION TESTS WITH RAMP CYLINDER HEAD. NATURALLY ASPIRATED COMPRESSION RATIO = 6.4 FUEL = Nᵒ1 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). UPPER GRAPH: TITLE: REDUCING DEGREE OF DETONATION BY RETARDING IGNITION, & ITS EFFECT ON BMEP. LEFT Y-AXIS: B.M.E.P. (LBS./SQ. IN.) RIGHT Y-AXIS: AUDIBLE RANGE OF DETONATION (FEET). X-AXIS: R.P.M. CURVES: MAX BMEP (MAX. ADV.), DETONATION AT MAX. BMEP, BMEP CURVES OF CONSTANT DETONATION (60FT, 50FT, 30FT, 10FT, 0FT (ZERO DETONATION)). LOWER GRAPH: TITLE: EFFECT OF IGNITION ADVANCE ON DETONATION AT VARYING R.P.M. LEFT Y-AXIS: IGNITION ADVANCE X-AXIS: R.P.M. CURVES: MINIMUM ADVANCE FOR MAX BMEP, IGNITION ADVANCE CURVES FOR CONSTANT DETONATION (50FT, 30FT, 10FT, 0FT). | ||