Indicator diagram for a 40/50 HP engine, detailing performance data and valve timing.
| Identifier | Morton\M7\ img060 | |
| Date | 24th June 1913 guessed | |
| 40/50 INDICATOR DIAGRAM Data Table: 40/50 110° CAMSHAFT COMPRESSION RATIO 3.9-1 2,000 R.P.M. 77.1 H.P. 13° C AIR TEMP 763 m {Mr Moon / Mr Moore} /m BAR. COOLING WATER 80°C I.M.E.P. 81 LBS/SQ" B.M.E.P. 67.4 LBS/SQ" MECHANICAL EFFICIENCY 74% INDICATED VOL. EFF. 84.7% COMPRESSION PRESSURE. 73.1 LBS/SQ" EXPLOSION PRESSURE. 312 LBS/SQ" Valve Timing Diagram: TDC (Top Dead Center) EC. 10 (Exhaust Close) IO. 5 (Inlet Open) 227° EO. 47° (Exhaust Open) IC. 29° (Inlet Close) 202° BDC (Bottom Dead Center) Graph Labels: ATS I.O. (Inlet Open) E.C. (Exhaust Close) E.O. (Exhaust Open) I.C. (Inlet Close) Vertical Axis (Pressure LBS/SQ"): 350, 300, 250, 200, 150, 100, 50, 0, +10 Horizontal Axis (Crank Angle Degrees): 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180 Partially visible text on left margin: ERE | ||
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).