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).
Graph comparing the performance of a 110° and a 116° camshaft on a standard 'China' engine.
| Identifier | ExFiles\Box 102\5\ scan0020 | |
| Date | 12th November 1929 | |
| CAMSHAFT COMPARISON (STD. "CHINA" ENGINE) ENGINE Nº GOS-C5 (3.250" BORE). COMPRESSION RATIO = 4.75. STANDARD INDUCTION SYSTEM. STANDARD 20H.P. CARBURETTOR. OPEN EXHAUST. BRAKE HORSE POWER. B.M.E.P. (LBS PER SQ. IN.) R.P.M. OF ENGINE. 110° CAMSHAFT. 116° CAMSHAFT. VALVE TIMING ("O20" CLCE). Nº1 CYL. INLET OPENS INLET CLOSES EXHAUST OPENS. EXHAUST CLOSES. 110° CAMSHAFT. 12° AFTER T.D.C. 32° AFTER B.D.C. 33° BEFORE B.D.C. AT T.D.C. 116° CAMSHAFT. 14° AFTER T.D.C. 50° AFTER B.D.C. 43° BEFORE B.D.C. 5° AFTER T.D.C. | ||