At the same time as the newly renamed "Typ 630" appeared, in 1926, the manufacturer introduced the Mercedes-Benz Modell K which used the same engine and the same overall chassis architecture, except that the wheelbase was shortened by 350 mm (14 in) to 3,400 mm (130 in) .
The "K" stands for "kurzer Radstand" (short wheelbase),  This car was available as a four-door “Sports four seater” or as a two-door “Roadster”.
  From the right side of the bonnet/hood emerged three stout metal pipes carrying the car's exhaust gases, merging at the lower edge of the bonnet/hood into a large single exhaust pipe.
  This detail later became a hallmark of Mercedes-Benz ”Kompressor” cars.

The top speed of the sports car was listed as 145 km/h (90 mph).

From 1928 the Modell K received a still more powerful "Kompressor engine", although there was no change to the overall engine size.
  Stated power now increased to 110 PS (81 kW; 108 hp) or, with the compressor switched on, 160 PS (118 kW; 158 hp).
  The official performance figures were unchanged.
At the same time as the newly renamed "Typ 630" appeared, in 1926, the manufacturer introduced the Mercedes-Benz Modell K which used the same engine and the same overall chassis architecture, except that the wheelbase was shortened by 350 mm (14 in) to 3,400 mm (130 in) . The "K" stands for "kurzer Radstand" (short wheelbase),  This car was available as a four-door “Sports four seater” or as a two-door “Roadster”.   From the right side of the bonnet/hood emerged three stout metal pipes carrying the car's exhaust gases, merging at the lower edge of the bonnet/hood into a large single exhaust pipe.   This detail later became a hallmark of Mercedes-Benz ”Kompressor” cars.
The top speed of the sports car was listed as 145 km/h (90 mph).
From 1928 the Modell K received a still more powerful "Kompressor engine", although there was no change to the overall engine size.   Stated power now increased to 110 PS (81 kW; 108 hp) or, with the compressor switched on, 160 PS (118 kW; 158 hp).   The official performance figures were unchanged.
Mercedes 24/100/140 PS