New Leyland 150 b.h.p. Engine
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ANEW 11.1-litre six-cylinclered oil engine of 150 b.h.p. output at 2,000 r.p.m. is now being prodoced by Leyland Motors, Ltd., Leyland, Lanes, for use in earthmoving equipment and Diesel electric power units. According to the maker, it is not yet intended for installation in buses or lorries.
In general design, the power unit is similar to, and interchangeable with, the 9,8litre engine used in Leyland vehicles, having the same external dimensions and positions of auxiliaries and mountings.
Termed the 680 model, the bore and stroke are 5 ins. and 51 ins, respectively, and its maximum torque of 450 lb. ft. at 1,100 r.p.m. corresponds to a b.m.e.p. of 100 lb. per sq. in. Apart from the increase in bore and a change in the water circulation system the cylinder block and crankcase casting is similar to that of the 9.8-litre unit. Water passes direct from the impeller into the cylinder block, from which it is directed into the cylinder heads and on to the injector nozzle and exhaust-valve housings. Dry cylinder liners are fitted.
Although the increased stroke has required new crankshaft and pistons the standard connecting rods are em
ployed, the distance from the top 'of the piston crown to the gudgeon .pin being reduced by 1, in., so that the overall length from the top of the piston at top dead centre remains the same as that of the 9.8-litre unit. Other differences include larger valve heads and ports.