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).
Air flow tests of a combined temperature control and air cleaner for an S.U. carburetter.
| Identifier | ExFiles\Box 123\1\ scan0105 | |
| Date | 17th June 1936 guessed | |
| AIR FLOW TESTS OF COMBINED TEMPERATURE CONTROL and AIR CLEANER. The following tests were carried out in order to determine the amount of restriction to air flow when fitted to a standard make of carburetter of a suitable size; having ascertained the loss, experiments were then to be carried out in order to improve the discharge rate of the instrument. Description. An S.U. carburetter of 1 1/2" outlet size was chosen as this type of constant vacuum instrument gives a very high air discharge. The carburetter was mounted on an air measuring device of the airholder type and the air drawn through the carburetter at the same depression throughout the tests, the throttle and dashpot being in full open position. All tests were carried out with the temperature control instrument attached to the intake of the S.U. carburetter. Figures of merit are given for the air flow, the highest numbers being the most efficient. Test No.1. The air flow of the S.U. carburetter in the full throttle position was taken to provide a datum line giving a figure of merit of 9.55. This size of carburetter would be able to deliver enough air to develop up to 80 H.P. on efficient engines. Test No.2. As predicted by the writer the bell mouth construction of the air entry in the temperature regulator considerably improved the flow through the carburetter giving a figure of merit of 10.9 This test was carried out with all parts of the Temperature Regulator removed leaving the bell mouthed entry attached to the carburetter only. This is a most important feature of the invention and the success of the instrument from an air flow stand point is this one feature. The failure of other devices of a similar character has always been through the reduction of air flow so causing bad volumetric efficiency. RP81 S. SMITH & SONS (Motor Accessories) LTD., CRICKLEWOOD WORKS, LONDON, N.W.2. Continuation No. | ||