The 6/18 PS was a lower middle-class automobile manufactured by the German automotive firm Benz & Cie from 1918 to 1921. It was the smallest Benz model put into production after World War I. The 6/45 PS, a stronger sport model of the same size, replaced the 6/18 PS in 1921 and continued to be produced until 1923.
The 6/18 PS was fitted with a 1570cc four-cylinder inline engine capable of generating 18 bhp (13.2 kW) at 2100 rpm, while the 6/45 PS used an engine of the same size, but was capable of 45 bhp (33 kW) at 3200 rpm. Engine power was transferred from a leather cone clutch to a three- or four-speed gearbox, and from there via a propshaft to the rear wheels. The 6/18 PS had a top speed of 85 km/h, while the later 6/45 PS could reach speeds up to 115 km/h. Both vehicles weighed at least 820 kg and rode on a 2545 mm wheelbase.
The 6/18 PS was offered as a leaf-sprung two- or three-seater open car with wooden or wire-spoked wheels and pneumatic tires, whereas its sport counterpart was only offered as a two-seater.
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