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 fuel economy improvements for the Phantom model.
| Identifier | ExFiles\Box 160\2\ scan0068 | |
| Date | 24th November 1925 | |
| FUEL ECONOMY POSSIBILITIES PHANTOM (4) THEORETICAL IDEAL FACTOR TO BE ELIMINATED MAX. POSSIBLE IMPROVEMENT IN M.P.G. A.{Mr Adams} ROLLING & WIND RESISTANCE. TYRE POWER TRANSMISSION LOSSES. 35% B. ENGINE FRICTION & PUMPING LOSSES. 30% C. OIL CHURNING LOSSES IN GEAR BOX. & BACK AXLE. 8% IMPROVEMENTS ACTUALLY EFFECTED. FACTOR ELIMINATED. IMPROVEMENT M.P.G. HIGH GEARED AXLE RATIO RAISED FROM 3.47 TO 3.06 11.5% HARD TYRES PRESS RAISED FROM 25 TO 60 LBS/□" 10% COOLING WATER TEMP. RAISED FROM 70°C TO 95°C 8% MAX. ECONOMY MIXTURE SETTING 2 NOTCHES WEAK. 7% EXTRA IGNITION ADVANCE FROM 20° TO 50° B.T.D.C. 4% ROAD SPEED ALL TESTS 20 M.P.H. ROLLS-ROYCE, LIMITED PRINT ROOM, 24 NOV 1925 DERBY. | ||