New 11.4-litre Meadows Engine
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LTIGHLIGHT of the exhibits to be I I shown by Henry Meadows, Ltd., Wolverhampton, at the Commercial Motor Show will be a turbocharged version of the 6DC 630 oil engine known as the 6DCS 630. Other exhibits will include a new unit, the 6DC 700, with a capacity of 11.4 litres, which is an adaptation of the 6DC 630. A 4DC 330 will be shown equipped with C.A.V. D.P.A. distributor-type injection pump. The 6DC 500 will be exhibited in vertical and horizontal forms.
All the naturally aspirated engines have been uprated by some 10 per cent. The new ratings are based on test outputs after a running period of 100 miles, The rating of the 4DC 330 has increased from 90 b.h.p. at 2,400 r.p.m. to 100 b.h.p. at 2,500 r.p.m., whilst that of the 6DC 500 is 150 b.h.p. at 2,500 in place of 135 b.h.p. at 2,400. The normally aspirated 6DC 630 has been increased from an output of 130 b.h.p. at 1,900 r.p.m. to 145 b.h.p, at 2,000 r.p.m.
In turbocharged form, this 10.3-litre unit develops 185 b.h.p. at 2,000 r.p.m. and a torque of 540 lb.ift. at 1,400 r.p.m. On the new rating basis the torque of the naturally aspirated engine is 430 lb./it. at 1,200 r.p.m.
Turbocharger equipment comprises a Holset Schwitzer unit with a turbine wheel diameter of 4 in, which gives a compression ratio of approximately 1.8 to 1 at maximum speed. It may be fitted at the side of the engine or above it according to the space available. A two-entry turbine is a feature of the blower, and a divided exhaust manifold is employed. The only modification made to the power unit is a reduction in the compression ratio from 16 to 1, to 15 to 1.
Original features of the 6DC 700 unit comprise a modified crankshaft, giving a longer stroke, and pistons with reduced crown height. The bore and stroke of the engine are 130 mm. and 143 mm. respectively, and the unit has an automotive rating of 165 b.h.p. at 2,500 r.p.m. The crankcase, cylinder block and cylinder head are identical to the 6DC 630.
Equipping the 4DC 330 with a C.A.V. distributor-type pump has given advantages with regard to bulk, weight and price, and the pump affords a slightly better fuel consumption and a cleaner exhaust at higher b.m.e.p.s.
SUPERCHARGING AT WILL THE newest version of the Italian 0.M. I Tiger goods vehicle has a 105-b.h.p. four-cylindered oil engine fitted with a supercharger to boost its output to 135 b.h.p. The blower can be engaged by means of a hand control on the steering column when conditions demand extra power, whilst for economical cruising the blower is disengaged.
The Tiger is rated for a 61-ton payload solo, or 12 tons with trailer, and has an 8-speed synchromesh gearbox and air brakes.