Graph comparing the flow rate versus pressure difference for a standard head and a large inlet valve head on a Phantom engine.
| Identifier | ExFiles\Box 31\2\ Scan115 | |
| Date | 29th August 1933 guessed | |
| CURVE 3 PHANTOM COMPARISON OF STANDARD HEAD - E.83538 & LARGE INLET VALVE HEAD - E.83906 AT FULL VALVE LIFT - i.e. .480" LIFT. FLOW THRO' PORT CU.FT./MIN. (1) - STD. HEAD E.83538 (2) - LARGE VALVE HEAD - E.83906 PRESS. DIFFERENCE ACROSS VALVE - Hg. | ||
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).