An Extra-air Device
Page 49
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NUAIEROTTS devices for admitting extra air into induction manifolds are available, but not many are of practical interest. Mr. A. E. Brown, 181, Malden' Road, Kentish Town, London, NAV., has -taken out a patent for an extra-air device whch opens when the engine is running fast, but closes at low speeds,
This device is operated by the rush of the mixture. As the result of this, be claims to be able to obtain all the extra air that is necessary at high speeds without the attendant troubles of irregular running when the throttle is nearly closed.
It comprises a flange in. thick, which is accommodated between the carburetter and the induction pipe. Across the aperture is .placed a steel tube, having bearings in the walls of the flange and being free, therefore, to rotate. Attached to the centre of the tube is what might be describethas an ear, so shaped that, whether placed transversely or longitudinally in respect of the air stream, it offers a resistance to the flow.
The rotation of the tube is governed by a spring and limited by stops, so that when the inrush of mixture is rapid the tube is turned and two holes at its outer ends uncover ports in the flange, thus permitting an inrush of air.