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).
Performance graph and timing diagrams for the E57177 (112°) camshaft.
| Identifier | ExFiles\Box 102\5\ scan0144 | |
| Date | 10th October 1932 guessed | |
| UNIT C5 20/25 HP (CHINA) E 57177 (112°) CAMSHAFT RM{William Robotham - Chief Engineer} 69 COMP. RATIO 5.7:1 E 57177 (112°) CAMSHAFT (TWO EXHAUST CAMS) STANDARD INDN SYSTEM OPEN EXHAUST Ⓐ EARLY TIMING (TAPPET CLR .006) Ⓑ LATE TIMING (TAPPET CLR .020) Ⓒ (TAPPET CLR .006) Ⓓ EARLY TIMING (TAPPET CLR .020 IN EX .006) Timing Diagrams: Left Diagram (Exhaust): TDC, BDC, Ex, 3.5°, 7.5°, 58.5°, 41° Right Diagram (Intake): TDC, BDC, IN, 3.5°, 7.5°, 49.5°, 46° TAPPETS AT .020 Axis Label: B M E P | ||