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).
Petrol pump issues concerning warped valves and circlip failures, with recommendations for material changes and optimal pump placement.
| Identifier | ExFiles\Box 149\4\ scan0019 | |
| Date | 2nd October 1936 | |
| -6- Hs{Lord Ernest Hives - Chair}/JBD.{John B. Dixon - Fuel Systems}14/KW.2.10.36. Trouble was also encountered with the Bakelite valves which warped and at times stopped the pump priming, though it was insufficient to affect the operation of the pump when dealing with petrol. Another fault discovered was that in some cases the circlip retaining the valve in the housing was not sufficiently bent to prevent the valve riding up on the edge of the clip, again preventing priming and allowing the possibility of failure at any time. Brass valves are now fitted and the circlips have been changed. Any fault in the valves should now be found out by S.U's as the brass valves do not warp. From the above tests it is clear that the pumps should be fitted in as cool a place as possible, with little or no suction head. This will also have a very beneficial effect on the noise of the pumps, as they will always be pumping petrol and the armature will not over-run its normal stroke as it does when priming or dealing with vapour. Secondly, we suggest that the pipe lines to the pump and carburetter should be tried outside the frame where possible, and the tank shielded from the heat of the tail pipe where the clearance is small. A pump designed to mount on the frame is now fitted to 35-EX. Hs{Lord Ernest Hives - Chair}/J.B.Dixon. | ||