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 engine torque for cast versus machined combustion chambers, corrected to 103°F.
| Identifier | ExFiles\Box 133\4\ scan0009 | |
| Date | 24th January 1934 guessed | |
| G.M.C. CORRECTION TO 103 °F CAST COMBUSTION CHAMBERS MACHINED COMBUSTION CHAMBERS ENGINE TORQUE FT. LBS. TORQUE REVOLUTIONS PER MINUTE Left Y-Axis: 250, 240, 230, 220, 210, 200, 190, 180, 170, 160, 150, 140, 130, 120, 110, 100, 90, 80, 70 Right Y-Axis: 100, 95, 90, 85, 80, 75, 70, 65, 60, 55, 50, 45, 40, 35, 30, 25, 20, 15, 10, 5 X-Axis: 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, 2000, 2200, 2400, 2600, 2800, 3000, 3200. | ||