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A Petrol-oil Carburetter
Page 101
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The New Claudel Atomizer for Use with a Mixture of Petrol and Diesel Oil
AT saving in running costs is claimed by converting from an existing petrol carburetter to the new Claudel atomizer which has been designed for use with a mixture of 60 per Cent. Diesel oil and 40 per cent. petrol. Efficient atomization of this mixture is obtained and a normal power unit will give the same high standard of performance as was previously obtained. whilst an unusually high degree of flexibility exists.
Difficulties associated with starting from cold are completely overcome, a fact which we proved to our satisfaction during the course of a recent demonstration.
The Claudel atomizer can readily be installed in place of the existing carburetter; it is necessary only to make suitable connections with the exhaust pipe to allow for the ingoing air to be considerably heated, whilst the induction manifold is also heated by means of jacketing communicating with the exhaust manifold.
The most important feature of the new instrument is the efficient vaporization obtained by the admission of a separate supply of warm air—apart from that drawn in through the main air intake—which is taken direct to the mixing chamber.
The instrument has three main parts, viz., the float, the mixing and the throttle chambers. Three jets are used, located at the side of the float chamber, the main jet being central and each located in a small compartment. One of the most interesting features of the carburetter is the design of the mixing chamber. It comprises four concentric tubes, the innermoat being plain, and the next having a series of small holes in it ; the third, again, is plain, but the outside tube has small holes near the bottom. At the top of the chamber is drilled a number of holes, whence the mixture emerges into the choke tube. The innermost tube is used to draw in the secondary hot-air snpply, as it may be described, but the temperature can be controlled by a cold-air inlet adjuster at the base of the instrument.
The petrol-oil mixture is also fed by a secondary jet to the outer annular space of the mixing chamber. Between the communicating passage and that of the main jet is a fourth jet feeding the inner annular space. This is an accelerator jet, by means of which the main fuel supply can be increased for rapid acceleration.
Yet another interesting feature is the way in which the normal air supply to the choke is governed automatically in proportion to the demands of the engine. The choke is surrounded by a drilled ring, there being over each hole a small steel ball; both ring and ball are carefully graduated. As the depression in the manifold increases, so certain balls are raised off their seatings, allowing additional air to be drawn in. For easy starting a cone surrounding the mixing chamber can be moved up or down to cheek the air flow.
The Claude) atomizer is handled in this country solely by Mr. H. Boswell Reid, 19, Grosvenor Place, London, S.W.3, who is able to quote for converting existing engines.