A Velocity-operated Extra-air Device rTVUE admission of air to the induc
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tion pipe is regarded as a method of reducing petrol consumption in certain cases. It is of importance, however, that the valve should not open below a certain engine speed.
Mr. A, E. Brown, of the Automatic
Air Admitter Co., 88, The Greenway, Hendon, London, N.W.9; has produced an extra-air device for petrol engines which marks an improvement on his earlier model, described in this paper dated February 3, 1931. The A.A.A. device, as it is called, is a flange interposed between the carburetter and the induction pipe. d tube formed with small wings lies across the aperture, being fixed to another tube lying in a tangential slot. When the engine speed is sufficiently high, the velocity of the gas is great 'enough to cause the winged tube to pivot, so that a hole in the tangential tube registers with a port in the flange causing air to be admitted.
. When the throttle is closed, the winged tube returns to its transverse position, being assisted by a light spring that can be adjusted to determine the engine speed at which the air shall commence to be admitted. This prevents the mixture from being too weak at low engine speeds.