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 the delivery rates of a Bensport petrol pump with varying needle valve bore sizes and configurations.
| Identifier | ExFiles\Box 27a\2\ Scan206 | |
| Date | 22th June 1933 | |
| BENSPORT PETROL PUMP COMPLETE SUCTION SYSTEM .250" DIA PIPES. DELIVERY THROUGH TWO S.U. FLOAT CHAMBERS 5/16" DELIVERY PIPES. INCREASED DIA. NEEDLE VALVE BORE (.125" DIA) COMPARED WITH STD. (.095" DIA) DELIVERY PTS/HR PUMP SPEED R.P.M FLOAT CHAMBERS REMOVED INCREASED NEEDLE VALVE BORE .125" DIA STD. NEEDLE VALVE BORE .095" DIA A.B. | ||