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Berna

12th November 1929, Page 154
12th November 1929
Page 154
Page 154, 12th November 1929 — Berna
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mHERE are not many examples of

Diesel-engined machines at the Show, but great interest attaches to those exhibited, • and many authorities on the subject of road transport have faith in the future of the heavy-oil engine for the larger passenger and goods vehicles. The Berna Co. is now producing six-cylindered heavy-oil engines, an arrangement having been made with the well-known Deutz concern, and it has had the foresight so to design these engines that they are interchangeable with the petrol-burning models. This means that owners of Berne fleets can experiment with the heavy-oil engine and, if they find it suitable for their particular work, can substitute this kind of power unit for the existing petrel engines in their chassis.

A model-05 chassis, intended for 5-6ton loads, is shown in which is fitted the impressive 80 h.p. six-cylindered -Diesel-engine,: this having a bore of 115 mm. and a stroke of 170 rem. Additionally, one of the Diesel engines, with its fuel-pump and injector system well in evidence, is exhiibted separately. With flywheel, starter and dynamo this engine weighs 16 cwt. and the ,price is £500. Those interested in the engine should not fail to note that it has pre-compression chambers located at the sides of the cylinders and affording space for large inlet and exhaust valves. The type of fuel pump employed is very simple and makes it pos

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sible for quite poor fuels to be used. It is claimed that even a mixture of paraffin and lubricating oil is satisfactory. The plunger of the pump is worked by an inclined earn, and this regulates the quantity of fuel in accordance with the load, the result being

that lever-actuated overflow valves and regulator spindles are not employed.

The question of starting the engine in cold weather has been dealt with, and the pump is driven through a trip gear, giving it an impulse action which causes the fuel to be injected in jerks, this action being automatically discontinued so soon as the speed of the engine has reached 200 r.p.m. Needletype injector nozzles ensure a tight

closure of the fuel pipe.' A very corn, pact ignition coil is employed which resemblesin shape the ordinary sparkinz

plug. .

A type-G5 chassis with a four-eylindered • petrol engine of the overheadvalve type (bore 115 mm., stroke 170 mm:) is shown equipped with a poweroperated three-way tipping body, the Price of the complete vehicle being 1,375. The wheelbase of this standard 05 ehasais is 15 ft. and the track 6 ft. Pneumatic tyres of 40-in. by 8-in. dimensions are fitted, with twin tyres on the rear wheels.

At the time of going to press the arrival was expected of a 0513 model which is to be exhibited as a bare chassis, the engine in this ease being a sixcylbadered unit of 115 mm. bore and 170 ram. stroke. Both this and the smaller engine have overhead valves and are equipped with a type of engine brake actuated by sliding the camshaft. It should be mentioned that the Berna 6-ton chassis is specially designed for hauling a trailer carrying a further load of six -tons. The rear axle is of the double-reduction type and the final drive is by exposed axle shafts with spur pinions engaging in internally toothed rings mounted on the road wheels. The machines have a good name on the Continent, which is the result of satisfactory working over a Period of many years in all classes of industrial haulage.

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