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New B.M.C.Engine and Suspension Options
Page 111
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OFFERED as an alternative to the 3A-litre diesel engine on Austin and Morris 2-, 3and 4-ton chassis;. and to be seen fitted to a show model on the Austin stand . at Earls Court,. a new B.M.C. 3.8-litre unit is a bored-out .yersion of the smaller engine and has a standard net output of 68 b.h.p. at 2,400 r.p.m: compared with a net output of 58 b.h.p. at the same speed developed by the 3.4-litre diesel. The Peak output of the new unit, in 'accordance with S.M.NP.T. test code 159 rating; is 76 b.h.p. at 2,500 r.p.m., whereas the peak rating of the basic engine is. 68 b.h.p. at 2,600 r.p.m. Corresponding gains in power output are 17 per cent and 12 per cent. respectively, whilst the maximum7torque increase from 150 lb.-ft. at 1,500 .r.p.m. to 168 111.-ft. at 1,750 r.p.m: also represents an improvement of 12 per cent.
Apart from an increase in• bore size from 3.740 in. (95 mm.) to '3.937 in. (100 mm.), features of the engine remain unchanged, including a stroke of 4,724 in. (120 mm.) and a compression ratio of 16.5 to I. A weight of 810 lb. is common to both units, and the additional cost of the new diesel is only £7 105. Although the unit is offered on Austin and Morris EG K40 2-ton chassis, it is anticipated that it will have greater appeal in the case of the FG K60 forward-control and the WE K60 normal-control 3-ton vehicles and of the FG K80 4-tonner.
Other B.M.C. show news includes the fitting of the C.A.V. DPA distributortype pump as standard equipment to B.M.C. 2.2-litre, 5.1-litre and 5.7-litre diesels in addition to the 1.5-litre unit, Also announced today, Clayton Dewandre Airpak air-assisted braking equipment is available for fitting to Austin and Morris diesel-engined vehicles in the 5-ton to 7-ton range and to the 18-ton prime mover. As exaniples of cost, an Airpak fitted to a WE K100 5-ton normal-control truck adds £18 13s. to the cost and equipping the FF K100 5-ton forward-control truck adds £17 18s. .
.Whilst no B.M.C. vehicle will be exhibited at the Show. with . Dunlop Pneuride air suspension, it is now available as a factory option on Austin and Morris LD M20 and LD M30 1-1.5-ton vans, fitted to the rear axle. Previously undertaken by the Dunlop Rubber Co., installation of Pneuride springing will in the future be carried out at the B.M.C. Adclerley Park works. The extra cost of the suspension is .£150.
The axle is located by quarter-elliptic leaf springs, which form flexible links between the chassis and air springS and are used in conjunction with a Panhard rod. Of the bellows type, the springs are mounted on brackets comprising dropped extensions of the leaf springs. The two levelling valves are located on the outside of the spring assemblies and a two-compartment expansion chamber is fitted transversely at the rear of the chassis.
Belt-driven from the engine crankshaft, the compressor is capable of an output of 1.5 cu. ft. per min. and creates a pressure of 200 p.s.i. in the air reservoir. A delay device in the levelling valves prevents automatic adjustment of the air pressure in the bellows during normal wheel movements on the road. Recommended maintenance includes drainage of moisture from the reservoir every 2,000 miles, checking belt tension and a general . inspection after 5,000 miles and, at 20,000-mile intervals, cleaning the air-filter element and checking the oil in
the levelling valves.
An extra-top-hat-Section cross-member is fitted in line with the springs and the two top-hat cross-bearers of the standard chassisat the front and rear of the axle are inverted and mounted below the main frame members to give a reduced floor height. Chassis with Pneuride suspension have been extensively used for ambulance applications.
A re-styled version of the Austin 10cwt. van and pick-up models is announced today, and at the same time it has been revealed that this basic vehicle is to form part of the Morris range, differing only in respect of the bars in the radiator grille. This will be the first 10-cwt. model marketed by Morris Motors, Ltd., since the Oxford-based van went out of production a number of years ago. Van and pick-up models will be displayed at Earls Court on the Morris Motors stand, and a van on the Austin stand.
All versions have the same mechanical specification, based on the original A55 car. The 10-cwt. is powered by the B.M.C. 1B-series petrol engine developing 47 b.h.p. at 4,100 r.p.m. The vehicle has a wheelbase of 8 ft. 3.5 in. and an overall length of 14 ft. 0.75 in. Body-floor length and maximum interior height are 6 ft. 6.25 in. and 3 ft. 7_5 in. respectively. Tyre size is 6.00-15.
Special styling features include a low radiator grille with horizontal bars of anodised aluminium: • Wheelboxes are of the flat-topped type and additional strength in the load area is provided by an auxiliary boxed frame under the rear of the floor. The spare wheel is carried in a special under-floor hinged container behind the rear axle.