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Oil-engine Surprises at Paris Show

25th September 1936
Page 113
Page 113, 25th September 1936 — Oil-engine Surprises at Paris Show
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I T seems likely that one of the high spots of the Paris Show, to be held from October 1-11, will be the new small Citroen oil engine. It is a fourcvlindered two-litre unit, running at about 2,000 r.p.m.• It has been designed for light delivery work and is stated to have broken all records in fuel economy. The Citroen company, however, denies that it is showing the engine. An interesting vehicle which will be seen at the Show is the new Somua 10-tormer, with an oil engine in which the compression-ignition system is not employed. It is not, however, a semiDiesel in the ordinary sense of that term, as ignition is effected by magneto and plugs of the normal petrolengine type. The engine has four cylinders of

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8 mm. bore and 150 m stroke, developing 65 b.h.p. at 2,000 r.p.M. when 'using gas-oil. The cylinders are cast in pairs, with detachable heads and the overhead valves are operated by Push-rods and rockers. The piston heads are concave in form.

Fuel is injected directly into the heads from a pump of normal type and is

ignited by the plugs. A centrifugal automatic-advance device is incor porated in the drive to the magneto. When starting up from cold, a small quantity of petrol is sprayed into the inlet pipe, which, under running con ditions, takes in only pure air. The petrol spray is delivered from a small hand-operated .pump on the instrument board. A normal type of electric starter is employed. This new engine has been mounted in a heavy-duty chassis for goods transport and in a low-level chassis for passenger work. The frame of the latter is built up entirely with electrically welded joints. Much weight has been saved by the special method of construction. The Somua concern states that its new engine has an exceptionally low fuel consumption for its power and cylinder capacity. A special advantage claimed is that the high compression ratio necessary in compressionignition units is avoided.

A Somua trolleybus will also be on view.

Messrs. Bernard, of Arcueil, have dropped all their petrol models and are concentrating solely on Gardnerengined vehicles for 1937. They build the Gardner engine under licence and build it so well that this British oil engine has acquired a splendid reputation in France during the past three years.

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