What is the engine displacement of the 1956 Ariel MK 2 Square Four?

The 1956 Ariel MK 2 Square Four has an engine displacement of 997.0 ccm (60.84 cubic inches).

1956 Ariel MK 2 Square Four Price, Specs, Review

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Review

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The 1956 Ariel MK 2 Square Four is a fascinating piece of motorcycle history, powered by a unique 997cc four-cylinder engine arranged in a 'square' configuration. This unusual layout, with two parallel twin engines geared together, provided a distinctive riding experience, delivering smooth power and a characteristic exhaust note. The large 23-liter fuel tank suggests a focus on touring, allowing for extended journeys without frequent stops. While not known for razor-sharp handling, the Square Four prioritized comfort and stability. The drum brakes, typical for the era, required a different riding style compared to modern disc brakes. The Ariel Square Four appealed to riders seeking a refined and distinctive machine, one that stood out from the more common parallel twins and inline fours of the time. The bike's ergonomics were geared towards long-distance comfort, with a relatively upright riding position. The Square Four was aimed at experienced riders who appreciated engineering innovation and were willing to maintain a complex machine. It represents a high point of British motorcycle engineering, showcasing a willingness to experiment and push the boundaries of design.

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License Class (EU)

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Rule of thumb: under 125cc / 15HP → A1, under 47HP → A2, above → A.

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Fuel Economy & Running Costs

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Estimated average for 997cc class: 35-50 mpg (5.0-7.0 L/100km)

⛽ Tank: 23.00 litres (6.08 US gallons)

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Insurance Class

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