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).
Blueprint showing desirable camshaft timing diagrams for the 40/50 model.
| Identifier | ExFiles\Box 13\2\ 02-page106 | |
| Date | 18th June 1931 guessed | |
| DESIRABLE CAMSHAFTS FOR THE 40/50 ALL TIMINGS .073" CLCE Diagram 1: 112° 25 H.P. INLET23D EX.240 Numbers: 1, 0°, 11°, 49, 49 Diagram 2: 116° 40/50 LIFT .420 IN.226 EX.241 Numbers: 2, 5-5°-6, 53.5, 52 Diagram 3: BEST TIMING OBTAINABLE USING 40/50 EX. CAMS. 114° CAMS. IN.240 EX.240 Numbers: 2, 10°, 50, 58 Diagram 4: IN.236 EX.236 Numbers: 3, 8, 48, 56, 4 Text Box: ASSUMING THAT WE ARE UNABLE TO OPEN THE INLET VALVE MUCH BEFORE T.D.C. ON ACCOUNT OF "ROARING". WE CONSIDER 3 WOULD BE THE BEST TIMING WE CAN GET WITH EXISTING CAM FORMS WHILST 4 MIGHT BE PREFERABLE WITH NEW CAM FORMS. CAMSHAFT 1 WE KNOW GIVES GOOD RESULTS. | ||