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 and alternative camshaft timings for the 40/50 model.
| Identifier | ExFiles\Box 182\M19\ img205 | |
| Date | 18th June 1931 guessed | |
| DESIRABLE CAMSHAFTS FOR THE 40/50 HS.{Lord Ernest Hives - Chair}381/ 1. T.D.C. INLET 230 EX 240 49 49 112° 25 H.P 2. T.D.C. 5° 7.5° IN 226 EX 241 52 53.5 116° 40/50 LIFT .420 c 8 3. T.D.C. 10° IN 240 EX 240 50 58 BEST TIMING OBTAINABLE USING 40/50 EX. CAMS. 114° CAMS 4. T.D.C. IN 236 EX 236 48 56 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. | ||