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 comparing a 112° long duration camshaft against standard and 116° camshafts.
| Identifier | ExFiles\Box 5a\5\ 05-page103 | |
| Date | 8th February 1930 guessed | |
| 112° LONG DURATION CAMSHAFT (CHIRA) ENGINE NO G2 - CL STANDARD INDUCTION PIPE EMBODIED 110° BENTLEY MKV BLOCK 1 3/4" LAGONDA 20 HP R.R. CARBURETTER COMPRESSION RATIO :- 5.25 OPEN EXHAUSTS 112° CAMSHAFT, E55640. INLET OPENS 14° AFTER T.D.C. INLET CLOSES 41° AFTER B.D.C. EXHAUST OPENS 41° BEFORE B.D.C. EXHAUST CLOSES 4° AFTER T.D.C. STD. (110°) CAMSHAFT (E54133) 116° CAMSHAFT (E55342) VALVE TIMING (LO20 C.L.K) 116° CAMSHAFT Inlet Opens: 14° AFTER TDC Inlet Closes: 50° AFTER BDC Exhaust Opens: 44° BEFORE BDC Exhaust Closes: 4° AFTER TDC 110° CAMSHAFT Inlet Opens: 10° AFTER TDC Inlet Closes: 32° AFTER BDC Exhaust Opens: 36° BEFORE BDC Exhaust Closes: 2° BEFORE TDC BRAKE HORSE POWER B.M.E.P. (LBS. PER SQ. IN.) RPM OF ENGINE | ||