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24th October 1922
Page 20
Page 20, 24th October 1922 — A NEW CHASSIS FOR LIGHT LOADS.
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Designed to Carry 4-5 Cwt., and Provided With Twin-cylinder Air-cooled or Fourcylinder Water-cooled engine, Constant-mesh Gears and Helical' Bevel Drive.

ACHASSIS which has won for itself a considerable name amongst the owners of light cars, and which is being employed to a certain extent as a light van, is made by G.N. Motors, Ltd., whose showrooms are at 222, Great Portland Street, London, W. 1. Until now the G.N. chassis embodied ii special form of gear consisting of separate chains, brought into use as required by means of dog. clutches. However, in the opinion of the makers, the chain drive for this type of vehicle has had its day. They have, therefore, built an entirely new model, embodying a three-speed gearbox and helical drive, which is a thoroughly sound job, and has the additional advantage of involving quite a Moderate outlay, the price of the complete light van, suitable for carrying 4-5 cwt., being 205 guineas, whilst dualpurpose bodies can be supplied to order. The chassis is made in two types—one with an air-cooled 90-degree twin engine, and the other with a four-cylinder water-cooled engine. The price of the latter model is 245 guineas.

The power unit on the air-cooled model is 84 mm. bore by 98 mm. stroke, giving 8.7 hp _ by R.A.C. rating. The valves differ from those employed on. previous models, as the noisy overhead inlet has given place to the side location of both valves which are operated by a substantial camshaft rosining in ball bearings. The cylinder heads are detachable, and the big-ends are of the roller bearing type, whilst the crankshaft also runs on ball bearings. Igni tion is provided for by an M. snag mete and carburation by •a Sot-ca instru ment. • The engine is built up as a unit with the three-speed constant-mesh gearbox, in which the gear changes are effected by clog clutches. The gem-shafts run on ball bearings, whilst. the reverse pinion runs on a roller bearing. The material employed for the pinions is K.E.805 steel. Following latest practice, the clutch is of the single-plate type with Ferodo friction surfaces.

The drive to the rear axle is by way of an enclosed propeller shaft with a sliding block-and-die type universal joint immediately behind ,the gearbox. The propeP,er ..shaft easing forms a torque tube, which terminates in a spherical joint. We have already referred to the rear axle as having helical bevel drive. In addition, we may mention there is no differential gear, and that bath brakes, which are of the internal-expanding type, operate direct:on the rear wheels. 7The. front axle is of the tubular type, the stub steles being fitted with single ball. thrustbearings.

Careful attention has been paid to springing. This is by quarter-elliptic springs all round.

The wheelbase is 8 ft. 2 ins., and the track 3 ft. 5 ins.

Disc wheels are fitted as standard. These are provided with 700 mm. by 80 mm. Dunlop 'Magnum tyres. The price includes dynamo lighting equip.'

meat, spare wheel and tyre. • •

The. four-cylinder model is very similar. except as regards the power unit. This is a. monoblec of 62 min. blare and 91 MM. stroke with overhead valves operated by enclosed push rods, detachable cylinder head, two-hearing crank• shaft, and forced lubrication to all bearings. This engine also forms a unit with the gearbox, as in the air-cooled type.

The company could have achieved even further reductions in the cost of their chassis if they had been content to, use inferior materials and plain bear% ings instead of ball bearings, but they preferred to ensure the ,satisfaction of users by providing the highest possible grades of steels, and a finish quite as good as that on many much more expensive vehicles.


Locations: London

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