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).
Graph comparing the performance of a 108° masked camshaft against a 114° unmasked camshaft with high lift rockers.
| Identifier | ExFiles\Box 182\M19\ img271 | |
| Date | 29th October 1931 guessed | |
| COMPARISON OF 108° MASKED CAMSHAFT AND 114° E82448 UNMASKED CAMSHAFT OPEN EX. C/R47 HIGH LIFT ROCKERS TWIN CARBS 1.4 CHOKES MASKED CAMSHAFT. INLET LIFT .547 EXHAUST .469 B.H.P. 160 150 140 130 120 110 100 90 80 500 1000 1500 2000 2500 3000 3500 R.P.M. INDUCTION DEPN INS HG B.M.E.P. 110 4 100 3 90 2 80 70 60 Diagram C (Top Left): EX IN C .020 CLCE 22 7.5 52 49 114° SHAFT E82448 VALVE LIFT INCR. TO .525 Diagram A (Bottom Left): EX IN A HIGH LIFT ROCKERS .020 CLCE 20 4 16.6 67.8 43.8 41 Diagram B (Bottom Right): EX IN B HIGH LIFT ROCKERS .020 CLCE 25.5 62.5 38.5 46.0 1.5 12 Curves: A, B, C | ||