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).
Letter to I.M. Waller in France discussing fuel starvation issues and modifications on the 32-EX model.
| Identifier | ExFiles\Box 149\4\ scan0370 | |
| Date | 10th July 1937 | |
| 1263 also 300 I.M.Waller. Hotel de France, Chateauroux, Indre, FRANCE. Rm{William Robotham - Chief Engineer}/JBD.{John B. Dixon - Fuel Systems}4/JH.10.7.37. 32-EX. Thank you for the information regarding temporary starvation on 32-EX, and suggestions for improvement. As this scheme is intended for complaint cases as well as for production, we wish to keep it as simple as possible with the minimum alteration to the present standard arrangement. We are glad to note a considerable improvement in the period of hesitation as compared with the present standard and also that there was no high speed starvation with the H.P. pumps with the high temperatures experienced. From your tests with and without the bonnet shows that the trouble lies under the bonnet hence we should not expect much gain by placing the filter or pipes outside the frame. The pipe direct to the carburettor did not give us any improvement on 35-EX though here the limiting factor was probably in the suction side of the pump. The ultimate scheme does away with the filter and pipe in the V and the pipe from the pump is behind the dash. With this arrangement we hope to still further reduce the temporary starvation even in the extreme conditions used in your tests. I am despatching to you a standard .180 needle valve and seat for the carburettor and would be glad to have a comparative value for this and the .130" now fitted. From experience on other cars it should not flood if clean, This .180 seat should only be used for test. On the high pressure pump fitted to 32-EX the contact covers require a small washer of about .060" on the brass screw under the cover as at present it is possible to pull on the contact bridge piece when the nut is tightened up. The dimensions have since been altered. | ||