Guy.

22nd November 1927, Page 149

22nd November 1927

Page 149

Page 149, 22nd November 1927 — Guy.

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As is only fitting in the exhibit of a. concern which has done so much to further the cause of the six-wheeler, no fewer than three six-wheeled models are shown at Olympia by Guy Motors, Ltd. The largest is a double-deck bus, .. seating 72 passengers, which has a wheelbase of 19 ft. 11 ins, and a track of slightly more than 6 ft. ; the power nnit is a six-cylindered engine with a bore and stroke of 41 ins. and 51 ins. respectively, giving a rating of 43.35 h.p. This giant has a covered top deck, and the total weight of the chassis is about • 4 tons 3 cwt. It is fitted with fourwheel brakes operated by means of a servo-motor, in common with all the larger Guy models, and the wheels carry 36-in. by 8-in, pneumatic tyres. This magnificent example of the six-wheeled bus, with its unusually large seating accommodation, attracts universal, attention.

Particularly impressive is the big sixcylinder six-wheeled stripped chassis shown, with its remarkable frame of extremely deep section, cranked up over the front and rear axles, and with an extremely low level between. The engine is fitted with two blocks of three cylinders, the heads of which are slanted on the usual Guy plan, and the whole of the manifolding is placed on the near side. Interesting fittings are an air cleaner and an oil purifier. The chassis is in most respects similar to that of the 72-seater, but the wheelbase is smaller-16 ft. 7 ins. Another interesting exhibit is a four-wheeled 32-seater single-decked vehicle, which is fitted with an engine of the six-cylindereil type. This is intended for fast long-distance journeys.

The last of the passenger vehicles is a 30 h.p. 26-seater coach, which has a wheelbase of 15 ft. 3 ins, and a track

of 5 ft. 9 ins. It is equipped with 36-in. by 6-in, pneumatics, single tyres being fitted at the front and twin tyres at the rear.

Turning to the goods vehicles exhibited, an interesting example is a 30cwt. van on pneumatic tyres, the fourcylindered engine of which has a bore of 88 mm. and a stroke of 120 ram., giving

an R.A.C. rating of 19.2 h.p. This has a wheelbase of 11 ft. 6 ins., and a track of 5 ft. 2 ins., and is intended for carrying loads up to 30 cwt. There is also a 2-ton lorry with a four-cylindered engine, which is particularly intended for overseas use, and is fitted with a Tulloch-Reading gas producer plant. The engine, in common with other four-cylindered Guy power units, is laid out on the well-known Guy plan, with inclined poppet valves operated by rockers from a camshaft in the crankcase, which give the "pent-roof 'type of combustion chamber usually associated only with high-efficiency overhead-valve engines.

Accessibility is a feature of these power units, as was recently described in The Commercial Motor. For example, the whole of the casing of the oil filter can be removed after slack( lag four nuts, or for ordinary cleani purposes the gauze can be taken o after undoing a single screw. In the engines the oil is taken under pressu to all the main bearings, the big-en picking up lubricant from troughs. T joint to the cylinder head is, of corm on the slant instead of being square wi

the cylinder bore, and the water joint between the head and the block ar formed by rubber rings so as -to avot the use of hose-piping. Piping maid the circulating system directs the wate entering the jackets to the neighbour hood of the valve seatings, so ensurim thorough cooling.

Another detail of interest is found b the gearbox, where (to ensure silence) the shafts are made no kss than 21 ins in diameter, and on the larger modeh are provided with central bearings in well as a bearing at each end. All hal bearings used for the support of the shafts are fitted in steel housings, which in turn are situated in the aluminium box ; a very sound plan, which precludes any possibility of the bearings hammering the aluminium.

Guy.

Page 149

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