Towards the end of 1951 Porsche introduced a larger version of the flat four engine. It was offered alongside the original 1.1 litre engine. It took a lot more effort to develop the third variation on the four cylinder theme; the '1500.' Introduced in the 356 1500 during 1952, the engine produced 55 bhp. Porsche's competition department reworked the 1500 engine with hotter cams and bigger Carburetors, boosting power to 70 bhp. In 1952 this engine found its way into a new road car; the 356 Super.