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 gas velocity past standard and larger valves against engine RPM for a 20 HP engine.
| Identifier | ExFiles\Box 19\7\ Scan111 | |
| Date | 31th March 1927 | |
| 5 20 H.P. GAS VELOCITY PAST VALVES. INLET AREA PAST VALVES:- STANDARD VALVES = 1.04 SQ. INS. LARGE VALVES (1.400 DIA") = 1.48 SQ. INS. STANDARD VALVES. LARGER VALVES. GAS VELOCITY (FEET PER SEC) R.P.M. OF ENGINE. | ||