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 discussing comparative testing of a new external pumping tube design to address fuel system issues.
| Identifier | ExFiles\Box 61\3\ scan0086 | |
| Date | 13th August 1930 | |
| Messrs.Rolls-Royce,Ltd., Date 13.8.30. Page 2 further with it, so as to check up with our figures, we could send this rig to you if you so desired. Of course the eventual test would have to be in a car. We feel confident, however, that there is only one unknown factor in the design, and that is the question as to whether the pumping of the fresh air by the new method will give us what we desire with regard to the elimination of loss of reading on cooling down, and this point, as explained previously, we had hoped to test with the Swan Spirit which the writer has here, to imitate the temperature conditions of tropical service. It is interesting to note that on a hot English Summer's day, the Swan Spirit in the writer's 20 h.p. Rolls-Royce car gave distinct indications of being too volatile for the petrol system piping etc., even with the shutters fully open and the engine temperature kept down to between 60° and 70° Centigrade. The over-night loss on the gauge reading under these conditions was excessive, using the old type of unit with the pumping tubes completely enclosed in the petrol tank. We have therefore the necessary particulars for a strictly comparative test with the new design of external pumping tubes. We shall be very pleased for you to retain the unit for as long as you like, and afterwards the writer | ||