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 of engine performance curves against RPM, with a valve timing diagram.
| Identifier | Morton\M4.2\ img035 | |
| Date | 10th March 1924 | |
| ENGINE Top Left Diagram: T.D.C, E.C., I.O., 8°, 225°, 45°, 45°, 220°, E.O., B.D.C., I.C. Left Y-Axis Labels: EXPLOSION PRESSURE LBS/SQ IN; I.M.E.P AND B.M.E.P. LBS/SQ IN; COMPR PRESSURE LBS/SQ IN VOL EFF % Right Y-Axis Values: 160, 140, 120, 100 Left Y-Axis Values: 450, 400, 350, 110, 100, 90, 80, 70 Curve Labels: I.M.E.P; B.M.E.P; AVERAGE PEAK EXPLOSION PRESSURE; COMPRESSION PRESSURE; INDICATED VOLUMETRIC EFFICIENCY Bottom X-Axis Label: ENGINE R.P.M. Bottom X-Axis Values: 500, 1000, 1500, 2000, 2500 Bottom Note: WITH ORIGINAL R.A.E INDICATOR Bottom Right: 10/3/24 | ||