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The Square Four is a motorcycle produced by Ariel between 1931 and 1959, designed by Edward Turner, who devised the Square Four engine in 1928. At this time he was looking for work, showing drawings of his engine design to motorcycle manufacturers. [ 5 ]
One of their first bikes was the Ariel Square Four, designed by Edward Turner, followed by the Ariel Red Hunter. [2] The Red Hunter was a success, and enabled Ariel to purchase Triumph. [8] Ariel 1,000 Square Four. The Ariel Square Four, with a 500 cc engine designed by Edward Turner, was launched for the 1931 season.
Ariel Square Four Mark I: 1949–53 "Square" four-cylinder 995 cc Ariel VCH 1949–53 500 cc all alloy engine competition bike, shorten frame with high ground clearance. Ariel KHA 1953 only all alloy engine version Ariel VHA 1952–53 500 cc alloy barrel and head Ariel Square Four Mark II: 1953–58 "Square" four-cylinder 995 cc Ariel HS 1954–58
Close-up of a 1932 Ariel Square Four 4F 600 cc engine The first Ariel Square Four 4F [ 7 ] was shown at the Olympia Motorcycle Show in 1930 in chain-driven overhead camshaft 500 cc form. This was heavier and slower than Turner's original prototype due to production changes made necessary by the Great Depression .
The Healey 1000/4 is a British motorcycle made by the Healey brothers between 1971 and 1977. [1] Fitted with an improved Ariel Square Four 1000 cc engine, the Healey was cheaper than a Honda Gold Wing, but only 28 Healey motorcycles were ever built.
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The 1931–1959 Ariel Square Four motorcycle used a four-cylinder engine (also called a 'square four' engine). The engine was compact and had as narrow a frontal area as a 500 cc, parallel twin. The rear pair of cylinders on this air-cooled engine were prone to overheating.