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NSU Ro 80

From Wikipedia, the free encyclopedia

NSU Ro 80
NSU Ro 80
NSU Ro 80
Manufacturer NSU
Production 19671977
Predecessor none
Successor none
Class Full-size car
Body style 4-door sedan
Platform FF
Engine 2 x 497.5 cc two-rotor Wankel engine, 115 hp (DIN)
Wheelbase 112.6 inch
Length 188.2 inch
Width 69.3 inch
Height 55.5 inch
Curb weight 2759-2848 lbs
Designer Claus Luthe

The NSU Ro 80 was a technologically advanced large sedan-type automobile produced by the German firm of NSU from 1967 until 1977. Most notable was the powertrain; a 113 bhp (86 kW), 995 cc twin-rotor Wankel engine driving the front wheels through a clutchless semi-automatic transmission employing an innovative vacuum system. It was voted Car of the Year for 1968 by European motoring writers.

Unfortunately for NSU, the car developed an early reputation for unreliability it could never escape. The Wankel engine in particular suffered from heavy wear on the rotor tip seals, among many other problems, and some early cars required a completely rebuilt engine before 30,000 miles (50,000 km), with problems visible as early as 15,000 miles (24,000 kilometres). Poor understanding of the Wankel engine by dealers and mechanics did not help this situation. By the 1970 model year, most of these problems were resolved, but the damage to the car's reputation and NSU's financial situation were irreparable. NSU was acquired by Volkswagen in 1969.

NSU Ro 80 club meeting in Antwerp, 1993
NSU Ro 80 club meeting in Antwerp, 1993

Other technological features of the Ro 80 aside from the powertrain were the four wheel disc brakes, which even now generally only feature on expensive sports or luxury sedans. The front brakes were mounted inboard, reducing the unsprung weight. The suspension was independent on all four wheels, with MacPherson struts at the front and semi-trailing arm suspension at the rear, both of which are space-saving designs commonly used today. Power assisted rack and pinion steering was used, again foreshadowing modern designs.

The styling, by Claus Luthe who was head of design at NSU and later BMW, was considered very modern at the time and still holds up well; the Ro 80 has been part of many gallery exhibits of modern industrial design. The large glass area foreshadowed 1970s designs such as Citroën's. The shape was also slippery, with a drag coefficient of 0.355 (practically unequalled for the era, although average for modern cars). This allowed for a top speed of 112 mph (179.2 km/h).

Series production started in October 1967: the last examples came off the production line in April 1977. Only 37,204 vehicles were produced during a ten year production run.

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