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 | WestWitteringFiles\N\2October1925-December1925\ Scan159 | |
| Date | 18th November 1925 | |
| No. 4 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% 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. STAMP: ROLLS-ROYCE, LIMITED PRINT ROOM 18 NOV 1925 DERBY | ||