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 of 110°, 112°, and 116° camshafts, plotting Brake Horse Power and BMEP against engine RPM.
| Identifier | WestWitteringFiles\T\2July1929-December1929\ Scan215 | |
| Date | 19th December 1929 | |
| 112° LONG DURATION CAMSHAFT (CHINA). V761. ENGINE N° Gos-C1. STANDARD INDUCTION PIPE. ENLARGED INDN PASSAGE THRO' BLOCK. 17% LARGER 20HP R.R. CARBURETTOR. COMPRESSION RATIO = 5.25. OPEN EXHAUST. 112° CAMSHAFT, E55640. INLET OPENS 7° AFTER T.D.C. INLET CLOSES 41° AFTER B.D.C. EXH'T OPENS 44° BEFORE B.D.C. EXH'T CLOSES 4° AFTER T.D.C. STD. (110°) CAMSHAFT, (E54115). 116° CAMSHAFT (E55362). VALVE TIMING. (.020 CLCE) 116° CAMSHAFT. INLET OPENS 14° AFTER TDC. INLET CLOSES 50° AFTER BDC. EXHAUST OPENS 44° BEFORE BDC. EXHAUST CLOSES 4° AFTER TDC. 110° CAMSHAFT. INLET OPENS 10° AFTER TDC. INLET CLOSES 32° AFTER BDC. EXHAUST OPENS 36° BEFORE BDC. EXHAUST CLOSES 2° BEFORE TDC. BRAKE HORSE POWER RPM OF ENGINE B.M.E.P (LBS PER SQ. IN) 19-12-29 | ||