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 engine performance with two different timing alterations on a 112° camshaft.
| Identifier | ExFiles\Box 102\5\ scan0080 | |
| Date | 23th September 1931 | |
| COMPARISON OF TIMING ALTERATIONS ON 112° CAMSHAFT WITH TWO CLAUDEL CARBS. INLET VALVE DIA. 1.4 C/R 5.13-1 OPEN EXHAUST 112° CAMSHAFT STANDARD ROCKERS. HEAD MACHINED TO GIVE MINIMUM CLCE OF ROUND INLET VALVE .275" TIMING A TOOTH EARLIER B VALVE LIFT .344 B.H.P. R.P.M. B.M.E.P. INDUCTION DEPN. Diagram A: EX. IN 46< 46 3.2 10.8 Diagram B: EX. IN 40 55 4.6 2.0 .013 CLCE. | ||