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Fowler . 148
Page 14
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ADVOCATES of the oil-engined vehicle should on no account miss this stand; the Fowler exhibits are the outcome of many years of experience with the compression-ignition engine, and, we can vouch from inspection and teat, that the latest types of lorry with the Fowler power unit are possessed of an outstanding performance.
Thi,s engine is what we may term of the " moderate-speed " class, but, by reason of the eight-forward-speed transmission it is possible to obtain such a range of road speed as meets the most exacting requirements. With an engine governed to 1.500 r.p.m., the geared-up " top " enables over 50 -m.p.h. to be attained in the case of the worm-driven 6-tonner.
Two large goods machines are displayed; one is a 6-7-ton type with a 5-6-ton trailer of the same make, whilst the other is a now chassis for 10-12-ton loads; it is, of course, a rigid sixwheeler.
Dealing first with the four-wheeler; this is of the type intended for heavyduty work and has a worm-drive rear axle of the overhead type. This feature distinguishes it from another model of the same pay-load capacity which has a bevel-and-spur axle; the latter machine is not exhibited, but is, of course, available to the public.
024
The eight-speed transmission is provided by a two-speed gearbox, mounted immediately behind the clutch-pit and in unit therewith, working in conjunction with the separately suspended fourspeed box. The former gives a gearedup or geared-down series of four ratios. A special point in connection with the clutch is that it is positively ventilated.
A study of the frame design is well repaid ; in order to cope with trailer haulage the rear end has been made really substantial, whilst the bracing system prevents " lozenging." As befits a vehicle of high-speed capabilities, the braking takes effect on all four wheels and assistance is derived from a Dewandre ram:ram-servo system. On the engine is an exhauster, and this is coupled to a reservoir which provides the required operating forte for the brakes, regardless of whether the engine be running or not.
Starting on this vehicle is by 24-volt motor, whilst the lighting circuit operates at 12-volt pressure. The former is capable of starting the engine on full compression.
In many respects the six-wheeler has a corresponding specification ; the bogie is of the three-differential pattern which gives long tyre life. The Fowler engine is, of course, used ; readers will recollect that a special feature of the design is that each piston contains a cavity ; the compressed air emerging from this during the process of combustion delays the pressure rise so that " Diesel knock" is diminished.
It will be noted that the injector nozzles are horizontally placed in the cylinder head and that the jets of oil fuel are directed straight across the tops of the pistons towards the openings in the crowns; these, of course, communicate with the air cavities already referred to. Admission and exhaust valves are vertically placed in the cylinder head and are operated by push-rods situated on the off side. A special point has been made of placing the important auxiliaries on the near side.—John Fowler and Co. -(Leeds)v Ltd., Leeds.