Before Edward Turner made his name with the quintessentially British "parallel twin", he dreamt up the square four. He pitched his idea to Ariel and so began the Ariel Square four. The square four is basically two parallel twins back to back. This configuration makes for smooth revs and a very compact size. The main drawback of the air-cooled square engine was the lack of cooling for the rear cylinders. The Square Four lasted from 1931 to 1958. Initially the engine displaced 500cc's, but it grew over the years to 1000cc's. The Square Four may not have been the raciest bike during the time, but its power and smoothness made it a great sport tourer. After being acquired by BSA in the 1950's Ariel focused on two stroke commuter bikes, abounding the Square Four program.
Apparently nothing sounds like a square four.
Before Edward Turner made his name with the quintessentially British "parallel twin", he dreamt up the square four. He pitched his idea to Ariel and so began the Ariel Square four. The square four is basically two parallel twins back to back. This configuration makes for smooth revs and a very compact size. The main drawback of the air-cooled square engine was the lack of cooling for the rear cylinders. The Square Four lasted from 1931 to 1958. Initially the engine displaced 500cc's, but it grew over the years to 1000cc's. The Square Four may not have been the raciest bike during the time, but its power and smoothness made it a great sport tourer. After being acquired by BSA in the 1950's Ariel focused on two stroke commuter bikes, abounding the Square Four program.
Apparently nothing sounds like a square four.
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