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Progress with a

16th August 1935, Page 46
16th August 1935
Page 46
Page 46, 16th August 1935 — Progress with a
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Single-valve Oil Engine

AS briefly reported in the issue of The Commercial Motor, dated April 26 last, encouraging results have been obtained by Barton Transport, • Ltd., Beeston, Notts, with a single-valve compression-ignition engine. In view of the success attending the early experiments, the concern has now adapted a Leyland four-cylindered oil engine to the single-valve system, and, at an early date, it is intended to install this unit in a Leyland chassis for further tests under operating conditions.

The single-valve is disposed horizontally in the cylinder head, the valve head forming the whole of one side of the combustion chamber, the other side being formed by a plug suitably shaped on its inner face.

In the earlier design the injector was accommodated in the side of the combustion chamber in a hole drilled in the plug; experiments have revealed, however, that better results are obtained with the injector in a vertical position.

In the later design the injector is, therefore, arranged vertically, the fuel being sprayed downwards through a pintle nozzle into the centre of the combustion chamber.

As the Leyland engine is of the highcamshaft type, the single valve for each cylinder is operated direct from the camshaft, thus obviating the need for rockers, tappets, etc.

An interesting feature of the cylinderhead is that, whilst provision has been made for water cooling, in practice this has been found to be unnecessary. The use of the single-valve, for both inlet and exhaust, results in the valve being adequately cooled by the incom B36 ing air. At the same time an added advantage is gained in that the air is pre-heated through contact with the valve before entering the combustion chamber.

A deflecting plate is provided in the exhaust manifold, giving a venturi effect, also providing a straight flow, for the gases. At the same time the outgoing gas induces a current of air in the inlet passages, and it is claimed that by the Test figures are not yet available, but we under

-, stand that results so far obtained lead the company to believe that equal power and speed to those of the conventional engine of the two-valve type will be possible. Fuel consumption is said to be reasonable and, from a maintenance point of view, the reduction in the number of parts constitutes an advantage. The results of further tests, carried out under operating conditions, are awaited.

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