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).
Fuel pump design proposals and experimental work for reducing under-bonnet temperatures.
| Identifier | ExFiles\Box 95\4\ scan0218 | |
| Date | 29th October 1936 | |
| (2) - pipe connections the pump that is not working should always remain full of petrol, for keeping the diaphragm in good condition. In the design we are combining an electrical switch with the 3-way tap which changes over the current from one pump to the other when the tap is changed over. There was no decision made as to the method of operation being under the bonnet, or on the facia board, but we are hoping to arrange a control for the latter. In connection with the present standard pumps on the Bentley which must be changed before the duplex scheme becomes available, we have issued a scheme this morning for putting studs into the dash whenever a pump change is made, so that there should be no further difficulty with detaching the pump. With regard to the question of reducing under bonnet temperatures, the proposals are set out in memo E.3/HP.29.10.36, and these call for the following experimental work:- (1) Figures for under bonnet temperatures should be obtained relative to radiator shutter position and road speed. (2) Figures for under bonnet temperatures should be obtained with no under guards. (3) Valances should be developed for shielding mud splash in place of the under guards. (4) The effect of the reduced under bonnet temperature should be observed on carburation with the thermostatic bypass control fitted for controlling engine temperature. (5) Distant control thermostats should be obtained from Hobson's with the correct filler for operating at 85ºC. These should be tested coupled up to the radiator shutters with the thermometer bulb carried in the engine water jacket. E.{Mr Elliott - Chief Engineer} [Handwritten in left margin]: Steadman | ||