The most well-known of Ariel’s engines, the Square Four, was introduced in 1931.
The Square Four offered four air-cooled cylinders set in a square formation. Ed Turner conceived the Square Four engine in 1928. At the time, he was looking for work and showing drawings of his engine design to various motorcycle manufacturers. |
The engine was essentially a pair of ‘across frame’ OHC parallel twin cylinders joined by their geared central flywheels, with a one-piece four-cylinder block (or Monobloc) and single head.
The idea for the engine was rejected by BSA, but adopted by Ariel. Thus it became the Ariel Square Four. Block Mfg.: Ariel Cylinders: 4 CID: 30 (500 cc) Bore: 65mm Stroke: 75mm Head Mfg.: Ariel Material: Aluminum Cam: Overhead, chain driven |
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