What type of engine did the original Porsche 356 have?

The original Porsche 356 had a flat-four engine.

The 356 used a compact, air-cooled, four-cylinder boxer engine mounted at the rear and driving the rear wheels. In a boxer layout, opposing pistons move outward and inward in pairs, helping keep the engine low and contributing to the car’s light, balanced character. Early engines were closely related to Volkswagen components, reflecting Ferdinand Porsche’s earlier work on the Volkswagen Beetle.

The first production 356 was completed in 1948 at Gmünd, Austria, and Porsche later moved production to Zuffenhausen, Germany, in 1950. The model evolved through the original pre-A series, 356A, 356B, and 356C, with engine sizes and outputs increasing over time while retaining the flat-four architecture for ordinary road cars.

The famous Carrera versions are a common source of confusion. Their advanced four-cam racing engines were also flat-fours, but they were special high-performance designs rather than a different engine layout. The later Porsche 911 replaced the 356 with a flat-six, which is why “flat-six” is associated with Porsche but is not correct for the original 356.