1954)- Ariel ,Square- Four ?Special in Ventura, CA
The engine was an unusual four-cylinder. V-twins and inline fours, set both lengthwise and across the frame, had been used previously but Turner?s new design had two vertical twins sharing a common crankcase. The cylinder barrels were cast as a unit in a monobloc design. Their two crankshafts were joined by a flywheel and rotated in opposite directions.
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The engine was an unusual four-cylinder. V-twins and inline fours, set both lengthwise and across the frame, had been used...
In 1928, engineer Edward Turner was shopping a new motorcycle design to English manufacturers. BSA turned him down, but...