The car was almost unique among British volume-produced saloons in featuring an overhead camshaft engine though both Wolseley's postwar cars and the Morris Six MS did also use Wolseley's normal single overhead camshafts. Singer's engine was based on the one used in the Super 12 but with larger bore and shorter stroke, giving a capacity of 1506 cc. From 1951 the stroke was further reduced to give a capacity of 1497 cc to bring it into the sub 1500 class. From 1952 a twin-carburettor version was available for an extra £28. It was reported that the engine block was so tough that the manufacturers were happy to quote 65,000 miles (105,000 kilometers) as a "normal" interval between rebores.
