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).
Series of graphs illustrating the effects of ignition advance, axle ratio, and engine temperature on petrol consumption.
| Identifier | ExFiles\Box 160\2\ scan0071 | |
| Date | 14th December 1925 guessed | |
| (3) EFFECT OF IGNITION ADVANCE ON PETROL CONSUMPTION. WATER TEMP. 80°C. AXLE 15 x 52 SPEED 30 M.P.H. TYRE PRESS. 50 LBS/SQ.IN. MIXTURE CONTROL CENTRAL TYRES STANDARD. GRAPH 1: IGNITION ADVANCE. Y-AXIS: M.P.G. PET. CONS. (Values 13 to 17) X-AXIS: IGNITION ADV. DEGREES BEFORE T.D.C. (Values 20° to 60°) EFFECT OF CHANGING FROM A 15 TOOTH TO A 17 TOOTH AXLE ON PETROL CONSUMPTION WATER TEMP. 80°C TYRE PRESS. 60 LBS/SQ.IN. MIXTURE CENTRAL. TYRES STANDARD. GRAPH 2: AXLE RATIO Y-AXIS: M.P.G. PET. CONS. (Values 14 to 22) X-AXIS: ROAD SPEED M.P.H. (Values 10 to 40) GRAPH LINES: 17 x 52, 3.06-1 (solid line); 15 x 52, 3.47-1 (dashed line) EFFECT OF ENGINE TEMP. ON CONSUMPTION. AXLE 15 x 52 SPEED 30 M.P.H. MIXTURE CONTROL. CENTRAL TYRE PRESS. 50 LBS/SQ.IN. TYRES STANDARD GRAPH 3: COOLING WATER TEMP. Y-AXIS: M.P.G. PET. CONS. (Values 13 to 17) X-AXIS: TOP WATER TEMP. C° (Values 70 to 100) STAMP: 24 NOV | ||