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).
Modifications to the Phantom II petrol pump to improve its ability to evacuate air from the pipe line.
| Identifier | ExFiles\Box 17\5\ Scan135 | |
| Date | 9th June 1932 | |
| x7460. To A.{Mr Adams} from E.{Mr Elliott - Chief Engineer} c.c. Mr. Wor.{Arthur Wormald - General Works Manager} Hs.{Lord Ernest Hives - Chair} re Phantom II Petrol Pump. Referring to the difficulty of picking up petrol again after running out on the supply, due to having to evacuate the air in the pipe line. We have had a test made to measure the clearance volume of the pump. This figure we find is 9 cc. as compared with 11 cc. for the swept volume. Evidently the petrol pump is not a very efficient air pump, but we think there is no reason why this clearance volume cannot be very considerably reduced. We are therefore, slightly modifying the design to make the top of the plunger to which the fabric is secured of very simple form which will enable us to make the dome of the pump of a corresponding shape, and with no central nut sticking up on the plunger we can bring down the position of the delivery valve by a corresponding amount, and cut out some of the air passage. Since the delivery stroke of the pump is by spring we can also make the plunger finish its stroke against the dome instead of against some external stop. With these alterations we think the time required for evacuating the 5 cubic inches approximately of air in the pipe line should be very considerably reduced. An experiment is being made on the existing pump filling in the clearance space with some plastic material. E.{Mr Elliott - Chief Engineer} | ||