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 results from two different camshaft timing alterations.
| Identifier | Morton\M13.2\ img106 | |
| Date | 23th September 1931 | |
| RM.{William Robotham - Chief Engineer}35 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 A B R.P.M. B.H.P. INDUCTION DEPN. LBS/SQ Timing Diagram A: EX 46 IN 46 .013 CLCE. 3.2 1.0.S Timing Diagram B: EX 40 IN 55 4.0 2.0 | ||