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 for 110° and 116° camshafts in a standard 'Chuk' engine, detailing valve timings.
| Identifier | ExFiles\Box 5a\5\ 05-page230 | |
| Date | 12th November 1929 | |
| CAMSHAFT COMPARISON (STD 'CHUK' ENGINE) ENGINE No G.S.C.5 (3"x5.50" 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 (COLD 'CL') N.Y.G. | 110° CAMSHAFT | 116° CAMSHAFT INLET OPENS | 12° AFTER T.D.C. | 20° AFTER T.D.C. INLET CLOSES | 32° AFTER B.D.C. | 50° AFTER B.D.C. EXHAUST OPENS | 33° BEFORE B.D.C. | 45° BEFORE B.D.C. EXHAUST CLOSES | AT T.D.C. | 8° AFTER T.D.C. | ||