A New 3 b.h.p. Air-cooled Engine
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r‘F sturdy construction and straight
forward design, a small, singlecylindered air-cooled engine running on the four-stroke cycle is now being manufactured ly Kryn and Lahy (1028), Ltd., Letchworth, Herts. Designated the Coborn, the unit is intended for such work as propelling small motor rollers, lawn mowers or Edit tractors, driving air compressors, washing plants or electric lighting sets, or generating power for numerous other purposes in the garage, workshop, factory or farm.
Provided that the system is efficient and reliable, air cooling has certain advantages over water cooling. On the Coborn engine,, vanes, integral with the flywheel, impel a current of air on to the finned cylinder and head.
The bore and stroke of the engine are 3 ins. .(76.2 mm.) and 31 ins. (82.5
mm.) respectively, giving a piston displacement of about 23 cubic ins. (375 c.c.). It develops 2.4 b.h.p. at 1,200 r.p.m. and a maximum of 3.2 b.h.p. at 1,800 r.p.m. Its petrol consumption is stated to he .75 pint per b.h.p.-hr. at full load. The overall dimensions of the complete, self-contained unit are 1 ft. Si ins. high, 1 ft. 6i ins. long (without the starting handle), and 1 ft. 6 ins. wide. The weight is 130 lb. and the price 117 5s., or with a 2.54-to-1 reduction gear 119 Is. 6d.
Solex carburetter is used, the throttle being controlled by an ingenious governing system actuated by the current of cooling air.
Two Timken tapered-roller bearings carry the crankshaft. Lubrication is effected by splash from a dip trough, supplied with filtered oil by a pump.