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).
Theoretical and actual fuel economy improvements in M.P.G. for the Phantom model.
| Identifier | ExFiles\Box 178\1\ img061 | |
| Date | 26th November 1925 guessed | |
| FUEL ECONOMY POSSIBILITIES PHANTOM 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 AFFECTED 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. | ||