12-cylindered Two-stroke Oil Engine
Page 41
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JNE of the principal items of interest on the Foden stand at the Commercial Motor Show his year wilt be the 12-cylindered two-stroke 41 engine as arranged for use in road vehicles. 'his large engine weighs 2,500 lb. and develops 52 b.h.p. at 2,000 r.p.m., with a maximum 3rque output of 700 lb.-ft. at 1,500 r.p.m.
It consists essentially of two Foden sixylindered engines placid side by side and otating in opposite directions, the crankshafts eing linked by large helical gears. A single rankcase and cylinder-block casting is used and sere are four cylinder heads, all interlangeable.
Because the right-hand crank rotates the reverse direction, the superlarger and injection pump had to be ledified to function with the opposite itation. There are two pumps and to blowers, located on opposite sides the crankcase.
The gearing for all ancillary corn ponents is arranged at the rear of the engine, the trains being ahead of the connecting helical gearing for the crankshafts. A large-capacity lubricating-oil pump of the gear type is placed at the front of the block and driven from the right-hand crankshaft by a shaft from the rear of the engine.
An idler gear from the oil-pump drive drives the water pump. The exhaust
heavier rear bogie with an improved trailing axle and equal-length springs, I and vacuum-servo hydraulic braking.
A Girling 11-in, diameter master, cylinder is attached to the Clayton' Dewandre VH4/200 servo motor and acts on two-leading-shoe units on all wheels. The brake drums have now been changed slightly, being wider but smaller in diameter than previously. This braking system is also to be fitted to four-wheeled chassis for home use.
Also to be shown on the Sentinel stand are two luxury coach bodies mounted on SLC.630 chassis. A light six-wheeler chassis with alloy tipping body will be fitted with an Eaton twospeed axle.
manifolds project vertically from the top./ of the block between the two cylinder banks and are suitable for either forward or rearward exhaust. pipes. The flywheel is bolted to the left-hand crankshaft, thus rotating in the conventional direction, and a 24-v. starter engages with its gear ring.
The firing order for each bank is 1, 5, 3, 4, 2, 6, the two banks being stepped so that No. 1 cylinder of one bank fires after No. 1 cylinder of the other bank, and so forth. The total capacity of the engine is 8.18 litres, bore and stroke being 85 mm. and 120 mm. respectively, as in the fourand six-cylindered two-stroke engines.
A Foden four-wheeled four-cylinderengined dumper and a six-wheeled dumper with Gardner 6LW engine are also to be exhibited. These will have a half-cab and a new mounting for the air cleaners for the induction system. Two cleaners are fitted.