Over its 27 years of production, the Square Four evolved through progressive advancements attaining limitless reserves of pulling power and innate smoothness. The model was a longstanding and highly successful design for Ariel. The SQ4 has also been openly referenced by Japanese marques as a key influence in their early pursuit of the perfect four-cylinder machine. Designed by Edward Turner his design philosophy foreshadowed decades of modern design. He stated that he merely sought to deliver ultimate reliability and performance with minimum attentions