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).
Study of theoretical and actual improvements in fuel economy for the Phantom model.
| Identifier | ExFiles\Box 147\5\ scan0088 | |
| Date | 24th November 1925 | |
| FUEL ECONOMY POSSIBILITIES PHANTOM (4) THEORETICAL IDEAL FACTOR TO BE ELIMINATED. MAX. POSSIBLE IMPROVEMENT IN M.P.G. A ROLLING & WIND RESISTANCE, 35% TYRE POWER TRANSMISSION LOSSES. B ENGINE FRICTION & PUMPING LOSSES. 30% C OIL CHURNING LOSSES IN GEAR BOX, 8% & BACK AXLE. IMPROVEMENTS ACTUALLY AFFECTED FACTOR ELIMINATED. IMPROVEMENT M.P.G. HIGH GEARED AXLE 11.5% RATIO RAISED FROM 3.47 TO 3.06 HARD TYRES 10% PRESS RAISED FROM 25 TO 60 LBS/O" COOLING WATER TEMP 8% RAISED FROM 70°C. TO 95°C. MAX. ECONOMY MIXTURE SETTING. 7% 2 NOTCHES WEAK. EXTRA IGNITION ADVANCE. 4% FROM 20° TO 50° B.T.D.C. ROAD SPEED ALL TESTS 20 M.P.H. STAMP TEXT: ROLLS-ROYCE LIMITED PRINT ROOM 24 NOV 1925 DERBY. | ||