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 comparison graph and valve timing data for two different camshafts on a 'China' engine.
| Identifier | WestWitteringFiles\T\2July1929-December1929\ Scan140 | |
| Date | 12th November 1929 | |
| CAMSHAFT COMPARISON (STD. "CHINA" ENGINE) ENGINE N<u>o</u> GOS-C5 (3.250" BORE). COMPRESSION RATIO = 4.75. STANDARD INDUCTION SYSTEM. STANDARD 20H.P. CARBURETTOR. OPEN EXHAUST. Graph Axes: Left Y-Axis: BRAKE HORSE POWER Right Y-Axis: B.M.E.P. (LBS PER SQ. IN.) X-Axis: R.P.M. OF ENGINE Graph Data Labels: 110° CAMSHAFT. 116° CAMSHAFT. Table: VALVE TIMING (.020" CL<u>CE</u>). | N<u>o</u>1 CYL. | 110° CAMSHAFT. | 116° CAMSHAFT. | |---------------|---------------------|---------------------| | INLET OPENS | 12° AFTER T.D.C. | 14° AFTER T.D.C. | | INLET CLOSES | 32° AFTER B.D.C. | 50° AFTER B.D.C. | | EXHAUST OPENS | 33° BEFORE B.D.C. | 43° BEFORE B.D.C. | | EXHAUST CLOSES| AT T.D.C. | 5° AFTER T.D.C. | | ||