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 (B.M.E.P vs R.P.M) for different inlet and exhaust valve durations.
| Identifier | ExFiles\Box 13\2\ 02-page096 | |
| Date | 12th June 1931 guessed | |
| SHEET II BEST COMPROMISE OF INLET & EXHAUST VALVE DURATIONS TWIN CARBS CAMSHAFTS TO E 32381 PH. II UNIT 4.9 COMP. RATIO. OPEN EXHAUST B.M.E.P. EX. 040 INLET 030 INLET .030 Ex. .050 INLET .020 Ex. .050 INLET .020 Ex. .040 INLET .006 Ex. .008 B.M.P 165 161.3 158.5 Left Diagram: Ex.236 256 IN 18 0 48 S 58 INLET LIFT .480 Ex. LIFT .460 BEST TIMING R.{Sir Henry Royce} ENGINE CAMSHAFT IN .020 EX .040 Right Diagram: Ex 241 IN 226 55 76 53 S 52 BOTH VALVES LIFT .420 BEST TIMING STD. SHAFT SCH. 1053 | ||