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 a 112° masked camshaft and a 114° unmasked camshaft, plotting B.M.E.P. against R.P.M.
| Identifier | ExFiles\Box 13\2\ 02-page154 | |
| Date | 2nd December 1931 guessed | |
| R.M.P. 31. COMPARISON OF 112° MASKED CAMSHAFT AND 114° UNMASKED CAMSHAFT OPEN EX. C.R 4.7 HIGH LIFT ROCKERS. TWIN CARBS 1-4 CHOKES MASKED SHAFT, INLET LIFT .547 EXHAUST LIFT .469 114° SHAFT E.62448 VALVE LIFT INCREASED TO .525 Graph Labels: A B C Axes Labels: R.P.M B.M.E.P IND. DEPN. INS. HG. Timing Circle A: HIGH LIFT ROCKERS .020 CLCE EX IN Numbers: 21, 3, 11-2, 49, 44, 68 Timing Circle B: HIGH LIFT ROCKERS .020 CLCE EX IN Numbers: 29, 5°, 4°, 54-4, 36-3, 60-3 Timing Circle C: .020 CLCE EX IN Numbers: 52, 2-2, 7.5, 49 | ||