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).
Proposed larger petrol pump for the Phantom II model, detailing modifications and a tapping noise issue.
| Identifier | ExFiles\Box 17\5\ Scan178 | |
| Date | 27th August 1932 | |
| X 7460 R.{Sir Henry Royce} from E.{Mr Elliott - Chief Engineer} E.S/HP.27.8.32. c. Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} Hs.{Lord Ernest Hives - Chair} By.{R.W. Bailey - Chief Engineer} Petrol Pump. P.11. Please find herewith a print of Leg.3005 showing the larger petrol pump proposed for P.11. The diameter of the diaphragm has been increased from 2.3 to 2.7 and this modification in conjunction with a slightly longer stroke increases the capacity 50% over the present pump. To get this bigger pump in, the cross control shaft has had to be moved from above to a position below the pump. The operating mechanism also has had to be modified to the original RR. design with a rocking lever and this has the great advantage of enabling us to detach the pump as a unit complete instead of pulling it apart in position. The only complaint we know of now which is not being catered for is an occasional tapping noise ascribed to the action of the mechanism picking up the diaphragm at part stroke. The A.C. is said to be immune from this noise, and we should say it must be that in their case the picking up occurs at a low velocity near the centre of the chain link pin of the mechanism employed. We could try out the equivalent of this on our rocking lever by making one half of the lever follow the rod, and pick up the other half by means of a jaw or face near the fulcrum centre. Another scheme we propose to try is some slight cushioning effect direct on the rod. | ||