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).
Graphs comparing the performance of different oils in a 6-cylinder Eagle engine, showing power curves, oil consumption, and oil pressures.
| Identifier | WestWitteringFiles\K\September1923\ Scan15 | |
| Date | 6th September 1923 | |
| 6 CYLINDER EAGLE POWER CURVES COMPARISON OF OILS TAKEN AT THE FINISH OF ENDURANCE TEST OF 1 HR FOR EACH OIL B.H.P CORRECTED 165 160 155 150 145 140 135 130 125 120 R.P.M 1400 1500 1600 1700 1800 1900 2000 2100 ⨁ - CASTROL OIL CONSUMPTION - 2.75PTS/HR ⊞ - PRICE'S GAS ENGINE OIL - 2.25 PTS/HR x - RICARDO-SHELL OIL - 2.125PTS/HR OIL PRESSURES DURING TEST LBS/SQ 50 40 30 OIL TEMPERATURES CONSTANT MINUTES 0 15 30 45 60 ROLLS-ROYCE, LTD. PRINT ROOM. -6 SEP. 23 DERBY | ||