1953 Ariel Square Four

1953 ARIEL SQUARE FOUR BACKGROUND
The original Ariel Square Four was created by legendary engine designer, Edward Turner in 1930. In its original form, it displaced 500cc and had four cylinders arranged in a ‘square’. It was unusual in that it had two crankshafts, one behind the other, each with two cylinders. These cranks were geared together 180 degrees out of phase. The cast iron one-piece cylinder block and removable head had a single overhead cam (SOHC). Also rare for the times, it had horizontally-split crankcases made of aluminum alloy. Before its official 1932 introduction, it was expanded to 601cc. In 1937, it was completely redesigned as a 995cc pushrod-operated OHV 4-cylinder and was dubbed the Model 4G, but carried the nickname “Squariel”.

1953 ARIEL SQUARE FOUR DESIGN
The Model 4G ditched the rigid rear frame in 1939 in favor of an Anstey-link plunger rear suspension, and a new frame to go along with it. In 1946, when civilian production resumed after World War II, a new telescopic front fork replaced the old girder forks. In 1949 the Mark I emerged, ditching the old cast iron cylinder block and head, in favor of aluminum alloy pieces, which both saved some 30 pounds of weight and aided cooling. This and other changes allowed the new Mark I, now with a whopping 35 horsepower at 5500rpm, to reach 90 mph-plus. The 1953 Ariel Square Four would be the final year of Mark I production, as it would be succeeded by the Mark II (what else?).

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1953 Ariel Square Four MkII
SPECIFICATIONS

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Check out these ARIEL BOOKS

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Ariel: The Complete Story (Crowood Motoclassics)

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Ariel Square Four 1948 Limited Edition Extra 1959

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Ariel Square 4 (Super Profile)

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The Modern Ariel Motor Cycle - 1939-47 Owners' Guide Single Cylinder Models

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Ariel Motorcycles Workshop Manual 1933-1951

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Book of the Ariel Leader and Arrow 1958-1966

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115MPH ARIEL Motorcycle Conversion Article.: Motorcycle Mechanics March 1966.

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Aurora to Ariel: The Motorcycling Exploits of J.Graham Oates, Pioneer Motorcyclist

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BOOK OF THE ARIEL 4 STROKE SINGLES 1939-1960

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For more like these, visit our ARIEL BOOK STORE

PLEASE BUY MY NEW E-BOOK HERE 12 Chapters & over 100 original photos. My best work yet. ONLY $4.99! Thank you, Andy Tallone, your humble author Click here to buy now: The Random History of Classic British Motorcycles, Volume 1

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Comprehensive Vintage Motorcycle Price Guide 2020-2021

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