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 four different types of experimental Bentley cylinder heads.
| Identifier | ExFiles\Box 31\2\ Scan122 | |
| Date | 29th August 1933 guessed | |
| CURVE 10 FLOW THRO PORT CU.FT/MIN COMPARISON OF TYPES OF EXPERIMENTAL BENTLEY HEADS. (1) - STANDARD BENTLEY HEAD EB.222 (2) LARGE INLET VALVE HEAD EB.615 (3) VENTURI VALVE HEAD HS{Lord Ernest Hives - Chair} (4) ECCENTRIC INCREASED PORT HEAD HS{Lord Ernest Hives - Chair} PRESS. DIFFERENCE ACROSS VALVE. - "Hg" | ||