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 showing the effect of ignition advance, axle ratio, and engine temperature on petrol consumption.
| Identifier | ExFiles\Box 178\1\ img060 | |
| Date | 21th November 1925 guessed | |
| 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." MIXTURE CONTROL CENTRAL TYRES. STANDARD. Graph 1: Title: IGNITION ADVANCE. Y-Axis: PET. CONS. M.P.G. X-Axis: IGNITION ADV. DEGREES BEFORE T.D.C. EFFECT OF CHANGING FROM A 15 TOOTH TO A 17 TOOTH AXLE ON PETROL CONSUMPTION WATER TEMP. 80°C. TYRE PRESS 60 LBS/SQ." MIXTURE CENTRAL TYRES STANDARD Graph 2: Title: AXLE RATIO. Y-Axis: PET. CONS. M.P.G. X-Axis: ROAD SPEED M.P.H. Data lines: 15 x 52, 17 x 52, 3.06-1., 3.47-1. EFFECT OF ENGINE TEMP. ON CONSUMPTION. AXLE 15 x 52 SPEED 30 M.P.H. MIXTURE CONTROL. CENTRAL TYRE PRESS 50 LBS/SQ." TYRES STANDARD Graph 3: Title: COOLING WATER TEMP. Y-Axis: PET. CONS. M.P.G. X-Axis: TOP WATER TEMP. C°. | ||