DIRECT FROM THE TANK

NZ Truth, Issue 1194, 18 October 1928, Page 20

DIRECT FROM THE TANK

Drastic Departure From Existing Carburettor System ■

jS the day of the carburettor as we know it' now coimng to an : A end? For a quarter of a century it has feigriedL. supreme-, as a necessary component of the engine.; . v.= ■ % '■ '

BEEQRE that time a device.knqwri as 'the surface carburettor was m use, m which the explosive vapor was taken directly from the tank. This method, m a much more up-to-date form, has been revived m p. re T ' markable arrangement developed . by the well known Stewart;- Warii^r Corporation m America. ;"; • , ; ' v •• It makes a clean cut of all the elaborate forms /of carburettors as we know them, and provides a cool, thoroughly well mixed and vaporized fuel which is necessary for perfect engine performance. ' The device consists of a vertical oylinder placed m the reap tank, with a float at the bottom maintaining a constant level of petrol 'm exactly tha same way as the ordinary carburettor float. *, A pipe taking air from the top 'of the tank enters this cylinder, passes to the bottom, and then travels tipwards to the top of the cylinclei;, whence it passes to another device fixed to the inlet manifold. The pipe m the cylinder is provided at two points with petrol jets.. The suction of the engine upon this pipe, draws the air through it, and m passing the jets the air picks up petrol to. form a rich) but wet, mixture. When this mixture reaches the engine block, it passes through an ex-; haust heated- box which ensures thorough vaporization^ It then enters, a

inrktui-e cliamli<br\ ':;bplted tfe the niariifoid. •■■7-:* ./:;, .■ ; .. .. /-•'.. ;".r;'A< . This chamber .' is. .subjected to the suction of the engine, and contains * a spring controlledwairflap valve, so. that when the engine i vis turning: over, it draws m a rich hot -mixture and cold air m the proportion of 'abbut* 1 ! to 4, variable by means of a' screw oh- .th# spring' 6f the 1 flap valve; - ■':■■ - .-^ * This system .absolutely eliminatesr all risk of flre.as the mixture; m Hie iJipe; is so rich that it is incombustible.- .'■;" A most severe series of back-, fires has failed to ignite the mixture jn the pipe. Lengthy tests have. shown that any given engine ; produces more power with Mess fuel consumption than with' any other carburation known. ■•'. The only ti-biibLS the new' system is Subjected to is the choking 1 of the jets m. the rear lu*tv, bur. th-»r,t> have been made of such a design that they can readily be removed. ■ Excellent acceleration is provided by the new system owing to the Blight lag m the air valve, which Provides a rich mixture exactly at the moment when it ia required. This remarkable new device looks to have a big future owing to its extreme simplicity and its obvious freedom from nine-tenths of the trouble that the present system is heir- to. • . ' The vacuum tank is, of course, no longer necessary, which is a good thing.