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 air flow through Super Sports and F-2-B series inlet valves against valve lift.
| Identifier | WestWitteringFiles\S\September1928-October1928\ Scan195 | |
| Date | 26th October 1928 | |
| V469. 26-10-28. COMPARISON OF AIR FLOW THRO' INLET VALVES (SUPER SPORTS & F-2-B SERIES). PRESSURE DROP ACROSS VALVE = 2.8 LBS/□" AIR FLOW (POUNDS PER MINUTE) VALVE LIFT (INCHES). SUPER SPORTS INLET VALVE (1.900" DIA). F-2-B SERIES INLET VALVE (1.750 DIA), IN SINGLE PORT. STANDARD MAXIMUM VALVE LIFT. JDR 26/10/28 | ||