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).
Blueprint graph comparing the open exhaust power curves of a 116° camshaft versus a standard 110° camshaft on a 'China' engine.
| Identifier | ExFiles\Box 102\5\ scan0017 | |
| Date | 4th November 1929 | |
| V.{VIENNA} 739. CHINA ENGINE - CAMSHAFT COMPARISONS ON THE HIGHER OUTPUT ENGINE. OPEN EXHAUST POWER CURVES. ENGINE DETAILS: COMP'N RATIO 5.25/1. LARGER EX & IN VALVES & PORTS. 4G 1/2 LARGER 20H.P.R.R. CARB. CYL BLOCK MIXTURE PASSAGE 1.200 DIA. STD IND'N. MANIFOLD. TIMING - 116° CAMSHAFT. TAPPET CL'CE = .020. I.O. 13° AFTER T.D.C. I.C. 48° AFTER B.D.C. E.O. 44° BEFORE B.D.C. E.C. 4° AFTER T.D.C. TIMING - 110° CAMSHAFT. TAPPET CL'CE = .020 I.O. 14° AFTER T.D.C. I.C. 33° AFTER B.D.C. E.O. 33° BEFORE B.D.C. E.C. AT T.D.C. Graph Labels: Y-AXIS: B.H.P. X-AXIS: R.P.M. UPPER CURVE: 116° CAMSHAFT. E.55362. LOWER CURVE: STD 110° CAMSHAFT. 4/11/29 | ||