New 250 b.h.p. Blown Oil Engine
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A SUPERCHARGED version of the .1-1 Meadows .six-eylindered 15.9-litre oil engine is to be shown at the British Industries Fair, 13irmingham. It has been designed primarily for extra-heavy road vehicles and tractors and for powering earth-moving and oilfields appliances.
• This unit has a bore arid stroke of 150 ram . and develops, in its normal aspirated form, 180 b.h.p. at 1,650 r.p.m. The supercharged unit has an output of 250 b.h.p. at 1,650 r.p.m. Maximum torque figures are 630 lb.-ft. at 900 r.p.m. unbiown and 820 lb.-ft at 1,000 r.p.m. when pressure charged.
In general design this big "six" closely resembles the Meadows 130 mm. model, but has two cylinder blocks, each with three bores, and wet liners instead of a single-piece block and dry liners. The 970, 'as the new engine is designated, has direct -injection into toroidal chambers. four valves per cylinder and a maximum mean piston speed of 1,620 ft. per minute. It has a good power-to-weight ratio, the approximate weight, complete with dynamo, flywheel, supercharger and two starter motors, being 3:500 lb.
A Brown Boveri blower, type VTR 160/29, is fitted and operates within a maximum speed of 33,000 r.p.m. compression ratio of 16 to 1 of the normal aspirated unit has been lowered to 15 to 1 for the supercharged engine and the pistons cut away to accommodate the valves.
In the blown engine the inlet valves open 85degrees before top dead centre and close 35 degrees after top dead centre. Exhaust valves open 45 degrees
before bottom dead centre and close 60 degrees after top dead centre, the overlap being 145 degrees The fuel consumption of the supercharged unit is claimed to be 0.362 to 0_40 pt./b.h.p./ hr. over the full load-speed range.
Overall, the engine is 631 ins. long, 32 ins, wide and 471 ins. high. It is made by Henry Meadows, Ltd.. Fallings Park, Wolverhampton.