Top fours: 4. Ariel Square Four-News & Reviews-Motorcycle Trader

25 Апр 2015 | Author: | Комментарии к записи Top fours: 4. Ariel Square Four-News & Reviews-Motorcycle Trader отключены
Kawasaki Square Four 2 Stroke Prototype

20 Feb 2013 | Ian Falloon nominates the of all time

Before World War II, fours with the engine were considered unwieldy, and fours too wide. Then one day in 1928, a London motorcycle Edward Turner, sketched on the of a cigarette packet the idea of two two by two. Turner made a to the Midlands trying to sell the and it was Ariel that provided with the resources to see his idea to

The first square-four (popularly the ‘Squariel’) appeared in 1931 and was a overhead camshaft 500. The layout of cylinders at the corners of a with two 180-degree crankshafts together and contra-rotating, set the pattern for the

To make the engine more for sidecar use, a 600cc was added in 1932 but, as were so many problems the initial design, the engine was updated for 1936.

Although the new engine retained the cylinder format, in most respects it was totally revised. The were now pushrod operated, the increased to 1000cc and the weight was The square-four continued until the of war largely unchanged and was resurrected hostilities ended.

The post-war initially retained the 997cc of the pre-war Squariel, but the addition of front forks and plunger springing saw the first post-war weighing over 225kg. figured it was time to shed weight and, for the 1949 the old cast-iron cylinder block and were scrapped and substituted alloy castings. The claimed saving was an optimistic 25kg but the weight saving was 15kg.

The alloy castings also cooling and with a 6:1 compression (to cope with the 72-octane petrol) the engine produced (34.5hp) at 5400rpm.

With production spanning 27 Ariel’s square-four was never a motorcycle. Revered for its smoothness, and acceleration, the Squariel was always and appealed as a status symbol than regular transportation.

a lack of development resulted in its but now the square-four is acknowledged as one of Britain’s classic motorcycles.

Early didn’t take to tuning and Ben Bickell managed to lap Brooklands at 175km/h, his supercharged 500 kept cylinder-head gaskets and he never a race.

The four-pipe Mark II Square appeared in 1954, lasting 1958. All Square Fours had rear springing although two pivoted-fork models were but not put into production.

Ariel Four engines were under licence in Canada and in pairs to power helicopters.



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