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 plotting gas velocity past standard and large valves against engine RPM for a 20 HP engine.
| Identifier | ExFiles\Box 5a\5\ 05-page045 | |
| Date | 31th March 1927 | |
| 5 20 H.P. GAS VELOCITY PAST VALVES. INLET AREA PAST VALVES:- STANDARD VALVES = 1.04 sq. ins. LARGE VALVES (2400 rpm) = 1.40 sq. ins. Standard Valves. Large Valves. GAS VELOCITY (FEET PER SEC) R.P.M. OF ENGINE. | ||