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).
Tests on a venturi type suction volute drain for supercharged engines.
| Identifier | WestWitteringFiles\U\January1930-April1930\ Scan071 | |
| Date | 28th January 1930 | |
| To S.R. From Ha/ACL.. (Held up) HR/ACL.1/MJ.28.1.30. X4550. SUPERCHARGED ENGINES - SUCTION VOLUTE DRAIN. We have made tests with the venturi type volute drain on a test rig using a Phantom test bed engine to supply the necessary induction pipe depression. The object of these tests was to find the best form and proportions for the venturi which would deal with the greatest quantity of fuel round about the induction pipe depression which exists when the supercharged engine is warming up. This depression is about 16"Hg. The arrangement of the test apparatus was as follows:- The induction pipe was connected with the venturi. The suction holes in the venturi were connected with a bottle containing petrol and this bottle was sealed and balanced up with the induction pipe pressure. Tests were made to find the rate fuel was taken from the bottle - which represents the volute - for various induction pipe depressions. Various forms and proportions of venturi were tested on the above basis and after various trials the venturi shown on appended print was found to be the best tested. During these tests various choke sizes, straight and stepped chokes, position of entry of fuel holes etc., were tested. The venturi shown on our sketch we recommend as capable of dealing with deposited fuel at a rate considerably | ||