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).
Design and specifications for a 40/50 HP pressure feed pump.
| Identifier | WestWitteringFiles\C\April1919\ Scan17 | |
| Date | 19th April 1919 | |
| To DY.{F R Danby} from E.{Mr Elliott - Chief Engineer} Copy to CJ. " " EH. " " EFC. 2 E1/G16/4/19. ORIGINAL 19 APR 1919 23 APR 1919 X.3538 RE 40/50 H.P. PRESSURE FEED PUMP 1.25 BORE X .6 STROKE We send you herewith drawing Spec.1075 shewing a design for the above. The capacity of the pump cylinder should be such that the pump develops 3 lbs. per square inch pressure. The dimensions for the design given have been taken from Derby drawing E.17759 and these should be checked experimentally. The carburettor float mechanism will require some slight alteration to maintain the same level as at present against the increased petrol pressure on the needle of 3 lbs. per square inch. You will notice from the drawing that a steel eccentric and gun metal connecting rod have been provided. The connecting rod therefore will not require bushing in the small end. The lower face of the big end of the connecting rod has been extended in the form of an eccentric flange, so as to deal more effectually with the weight of the connecting rod itself on this face. The lift of the valve is limited by a light sliding piece within the cap. Each of these pieces has spring fingers as indicated, which should be able to create a relatively considerable amount of friction. It is supposed that the slider will never move once set, owing to the friction holding it being so large compared with the vibration effects of the engine, and the pressure of the valve. (Contd.) | ||