Graph comparing the flow through a standard head and a large inlet valve head on a Phantom engine.
| Identifier | ExFiles\Box 31\2\ Scan114 | |
| Date | 29th August 1933 guessed | |
| PHANTOM CURVE 2 COMPARISON OF STANDARD HEAD - E.83538 & LARGE INLET VALVE HEAD - E.83906 AT MEAN LIFT - i.e. .354" LIFT FLOW THRO' PORT CU.FT./MIN. PRESS: DIFFERENCE ACROSS VALVE - "Hg (1) STD HEAD - E.83538 (2) LARGE VALVE HEAD - E.83906 | ||
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).