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 valve timing diagrams for an E57177 camshaft on a 20/25 HP engine.
| Identifier | ExFiles\Box 102\5\ scan0140 | |
| Date | 24th June 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 (A) EARLY TIMING (TAPPET CLR .006) (B) LATE TIMING (TAPPET CLR .020) (C) (TAPPET CLR .006) (D) EARLY TIMING (TAPPET CLR .020 IN EX .006) TDC BDC Ex In 5.5° 12° 58.5° TDC BDC In Ex 3.5° 6.1° 46° 49.5° TAPPETS AT .020 B.M.E.P. | ||