Ferdinand Porsche designed the S-Type for Mercedes-Benz in 1927. The racer was constructed using pre-existing road version Mercedes vehicles, mainly the 400 and 630 models. The names of these vehicles came from their displacement size in liters. For example, the 400 had a four liter engine while the 630 had a 6.3 liter engine, both were equipped a supercharger and six-cylinders. The engine was one of the most appealing attributes of these vehicles. The drawbacks that robbed the vehicles of performance were its size, weight and basic suspension system. A cushy suspension and large size was ideal for luxury vehicles that carried the elite in society, but at the track the vehicles were in need of more performance characteristics. An attempt was made to enhance the sporty nature of the 630 by shortening the wheelbase, which brought about the 'short' (Kurz) version. This drastically improved the vehicles sporty appeal but more was needed to enhance the handling. Mercedes answer to this problem was the S-Type version which saw the chassis lowered and the engine moved back. This improved the vehicles balance. To improve its performance, the engine capacity was enlarged to 6.8 liters. Thus, the 680 S was born.