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).
Graphical comparison of two camshafts (110° and 116°) on Engine N° IV G-8, plotting Brake Horse Power and B.M.E.P. against engine RPM.
| Identifier | ExFiles\Box 102\5\ scan0025 | |
| Date | 16th November 1929 | |
| CAMSHAFT COMPARISON - "JAPAN" ENGINE N° IV G-8 (3.250" BORE) COMPRESSION RATIO = 5.25. OVER-TYPE SLOTTED INDUCTION PIPE. 46% LARGER 20 HP. R.R. CARBURETTOR. OPEN EXHAUST. Graph Data: Left Y-Axis: BRAKE HORSE POWER Right Y-Axis: B.M.E.P. (LBS. PER SQ. IN.) X-Axis: R.P.M. OF ENGINE Curve 1: 110° CAMSHAFT Curve 2: 116° CAMSHAFT Table: VALVE TIMING. (-020 CLCE) N°1. CYL. | 110° CAMSHAFT | 116° CAMSHAFT INLET OPENS | 11° AFTER T.D.C. | 14° AFTER T.D.C. INLET CLOSES | 28° AFTER B.D.C. | 50° AFTER B.D.C. EXHAUST OPENS | 35° BEFORE B.D.C. | 45° BEFORE B.D.C. EXHAUST CLOSES | 2° BEFORE T.D.C. | 2° AFTER T.D.C. | ||