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).
Diagrams of modified and original exhaust valves, alongside graphs illustrating the relationship between fuel octane, torque, and engine variables.
| Identifier | ExFiles\Box 150\1\ scan0013 | |
| Date | 15th April 1935 guessed | |
| 4 DIVISION OF REFINING FIG. 3 MODIFIED EXHAUST VALVE WATER OUT WATER IN ORIGINAL EXHAUST VALVE THERMO-COUPLE LEADS WATER IN WATER OUT INSULATING TUBE THERMOCOUPLE JUNCTION 9 THE RELATION OF FUEL OCTANE NUMBER TO ENGINE COMPRESSION RATIO FIG. 13 Graph 1: Left Y-Axis: Fuel Octane No. for Incipient Knock Right Y-Axis: Percent of Torque at 85°F.{Mr Friese} Air Temp. X-Axis: Intake Air Temperature-Deg. F.{Mr Friese} Curves: Torque, Octane No. Caption: The Effect of Variation in Intake Air Temperature on the Torque and Fuel Anti-knock-Value Requirements of a Single-Cylinder Engine. Bore, 3 1/4 in. Stroke, 3 7/8 in. Speed, 800 r.p.m. Intake air temperature, varied. Throttle opening, full. Cylinder-head material, cast iron. Compression ratio, 5.75. Jacket temperature, 190 deg. F.{Mr Friese} Air-fuel ratio, 13.5. Spark advance, maximum power. FIG. 14 Graph 2: Left Y-Axis: Fuel Octane No. for Incipient Knock Right Y-Axis: Percent of Torque at 2.1" Vacuum X-Axis: Intake Manifold Vacuum-Inches of Water Curves: Torque, Octane No. Caption: The Effect of Variation in Throttle Opening on the Torque and Fuel Anti-knock-Value Requirements of a Single-Cylinder Engine. Bore, 3 1/4 in. Stroke, 3 7/8 in. Speed, 800 r.p.m. Intake air temperature, 85 deg. F.{Mr Friese} Throttle opening, varied. Cylinder-head material, cast iron. Compression ratio, 5.75. Jacket temperature, 190 deg. F.{Mr Friese} Air-fuel ratio, 13.5. Spark advance, maximum power. | ||