NSU Ro 80 Sedan
The NSU Ro 80, produced from 1967 to 1977, was one of the most technologically advanced and influential sedans of its era — a car that pioneered numerous innovations that would become industry standards decades later, yet ultimately destroyed its manufacturer through the catastrophic unreliability of its revolutionary Wankel rotary engine.
The Ro 80's design was strikingly modern for 1967. Claus Luthe's styling featured a low, wedge-shaped profile with exceptional aerodynamics for the era — the drag coefficient of 0.355 was extraordinary and remained unmatched by most sedans for over a decade. The smooth, flowing lines, flush-mounted glass, and integrated bumpers created a silhouette that looked contemporary well into the 1980s. The car won the European Car of the Year award in 1968, beating the BMW 2500 and Peugeot 504.
The heart of the Ro 80 was its twin-rotor Wankel rotary engine, displacing 995cc (nominal) but producing 115 horsepower — equivalent to a conventional piston engine of nearly twice the displacement. The Wankel engine's advantages were compelling: it was smooth, compact, light, and powerful for its size. The engine revved eagerly to 7,000 rpm with mechanical smoothness that conventional piston engines couldn't match. The power delivery was linear and progressive, with none of the vibration characteristic of four-cylinder engines.
Unfortunately, the Wankel engine's drawbacks proved catastrophic. The apex seals — thin metal strips that sealed the rotor chambers — wore rapidly, particularly if the engine was not warmed up properly or if owners failed to maintain the correct oil level. Seal wear led to compression loss, poor running, excessive fuel consumption, and ultimately complete engine failure. Many Ro 80s required complete engine rebuilds before reaching 50,000 km. NSU offered warranty replacements, but the cost of these warranty claims eventually bankrupted the company, leading to its absorption by Volkswagen in 1969 and the eventual phasing out of the NSU brand.
The semi-automatic transmission was another innovation. The three-speed gearbox used a torque converter but no conventional clutch. Instead, a microswitch in the gear lever activated a vacuum-operated clutch that disengaged when the driver touched the lever to change gears. This system provided smooth, clutch-pedal-free gear changes while maintaining the driver engagement of a manual gearbox. The system worked well when properly maintained but added complexity.
The chassis was equally advanced. Front-wheel drive, MacPherson strut front suspension, semi-trailing arm rear suspension, and four-wheel disc brakes — with inboard-mounted rear discs to reduce unsprung weight — provided handling that was responsive, predictable, and comfortable. The power-assisted steering was light and precise, making the Ro 80 easy to maneuver despite its considerable size.
The interior was spacious and well-appointed, with seating for five adults in comfort. The dashboard featured clear, modern instrumentation, while build quality was generally good, reflecting NSU's commitment to quality despite the company's small size. The driving position was excellent, with good visibility in all directions.
Despite its engine problems, the Ro 80 was hugely influential. Its aerodynamic styling influenced the Audi 100/5000, which effectively replaced it after Audi (VW's premium brand) absorbed NSU. The semi-automatic transmission concept influenced later Audi and Volkswagen semi-automatic designs. The overall package — front-wheel drive, aerodynamic styling, spacious interior, and advanced engineering — established templates that became industry standards.
Approximately 37,398 Ro 80s were produced during its ten-year run. Today, surviving examples with properly rebuilt or maintained engines are recognized as important automotive landmarks — cars that were decades ahead of their time in design and engineering, even if the execution ultimately proved flawed.
Verify the rotary engine has been recently rebuilt by a Wankel specialist — budget for a rebuild if not documented. Check compression on both rotors. The semi-automatic transmission requires proper adjustment and vacuum system function. Check for rust in floor pans, sills, and front subframe. Verify all four disc brakes function correctly. The inboard rear brakes are complex to service. Parts availability is limited but specialist suppliers exist. Low-mileage cars with regular use and maintenance are preferred over stored cars. Documentation of engine rebuilds is critical to value.
37,398 NSU Ro 80s were produced from 1967 to 1977. The car won European Car of the Year in 1968. Engine reliability problems led to massive warranty claims that bankrupted NSU, leading to its absorption by Volkswagen in 1969. Production continued under Audi ownership until 1977. Many cars received multiple warranty engine replacements during their service lives. The Ro 80's technology influenced later Audi models.