. Automotive industries . pproximately 8000 machines each. Bui as with cars,SO with motorcycles, British makers are very secretiveconcerning outputs. It is estimated, however, that the 1378 AUTOMOTIVE INDUSTRIESTHE AUTOMOBILE June 23, 1921 aggregate number produced during 1920 will be approxi-mately 50,000 from all plants, which averages, roughly,500 each. Engines Dealing specifically with the engineering features ofBritish motorcycles in general, it may be said that, whilefor lightweights having engines up to 2% , two-cycleengines with crankcase compression are used in 45 percent of cases
. Automotive industries . pproximately 8000 machines each. Bui as with cars,SO with motorcycles, British makers are very secretiveconcerning outputs. It is estimated, however, that the 1378 AUTOMOTIVE INDUSTRIESTHE AUTOMOBILE June 23, 1921 aggregate number produced during 1920 will be approxi-mately 50,000 from all plants, which averages, roughly,500 each. Engines Dealing specifically with the engineering features ofBritish motorcycles in general, it may be said that, whilefor lightweights having engines up to 2% , two-cycleengines with crankcase compression are used in 45 percent of cases; this form of motor is not made above 3 in isolated cases. Nevertheless, the two-strokemotorcycle engine up to 41/2 has shown itself to bequite satisfactory under normal conditions of use. Amachine with an engine of this type and power, havinga bore and stroke of 85 x 88 , was introduced atlast years show. This is the 4i;> Dunelt, which hasa two-stroke crankcase compression engine, three-speed. Four semi-elliptic springs supporting A. J. S. saddle independently of frame. Springs are anchored to rear luggage carrier gear-set and chain and belt transmission. It weighs,complete, 260 lb., and put up some excellent performancesin last years big trials. The Scott is another example of a comparatively highhorsepower two-cycle engine, but this has two water-cooled cylinders, This also stood outvery prominently in the big trials of 1920. But, gen-erally speaking, the four-cycle engine is still by far themore popular system, some 80 per cent of all machineshaving this type of engine. There are only isolated examples of engines with morethan two cylinders. A new machine appeared at Olympiawith a four-cylinder motor. This is the first Britishmotorcycle to have a four-cylinder engine, and it is be-lieved to be the first of any nationality of such an ad-vanced design as to embody overhead valves and cam-shaft, aluminum cylinders with steel liners and
Size: 2244px × 1114px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
