BMW 700 - Concept, Design, and Engineering

Concept, Design, and Engineering

Wolfgang Denzel, the distributor of BMW cars in Austria, commissioned Giovanni Michelotti to prepare concept sketches based on a lengthened BMW 600 chassis. In January 1958, Denzel was awarded a development contract for the 700. Denzel presented a prototype to BMW's management in July 1958. The concept, a 2-door coupe with a slanted roof, was generally well received, but objections were raised about the limited passenger space. BMW decided to produce two versions, the coupe, and a 2-door sedan with a taller, longer roof.

The engineer responsible for the chassis and suspension was Willy Black, who had designed and engineered the 600. The drivetrain and suspension were similar to those of the 600, with a rear mounted flat-twin engine powering the rear wheels, leading arm suspension at the front, and semi trailing arm suspension at the rear. The 700 used a steel monocoque structure, and was the first BMW automobile to do so.

The engine was an enlarged version of that used in the R67 motorcycle and the 600. With a bore of 78 millimetres (3.1 in) and 73 millimetres (2.9 in) of stroke, the engine displaced 697 cubic centimetres (42.5 cu in). The engine originally used a single Solex 34PCI carburetor and had a compression ratio of 7.5:1, resulting in a power output of 30 horsepower (22 kW).