37,340
produced between 1967 and 1977, voted European Car of the Year in 1968.
The car was designed in a wind-tunnel and powered by a twin rotor Wankel
Rotary engine of 995cc, 129 bhp at 5,500 rpm, rated as roughly
equivalent to a 1900cc piston engine. Front wheel drive with dual
circuit vacuum servo assisted disc brakes front and rear with the front
discs mounted inboard. Front suspension is independent MacPherson damper
struts with lower wishbone and anti-roll bar, rears are independent coil
springs with semi-trailing arms, telescopic dampers and a cross member.
Power assisted rack and pinion steering with a very short steering
column. 3 speed semi-automatic gearbox with a torque converter, clutch
operated by a micro-switch in the gear lever knob. Max. Speeds 55 mph in
first, 88 mph in second and 120 mph in third. The car would cruise
effortlessly at 100 mph all day, as one UK motoring scribe wrote the
faster it goes, the quieter it gets, until at about 100 mph there is
dead silence except for a slight wind noise from the door mirror and the
gentle echo of the cash register at the last gas station where the car
was filled up. Up to about 3,500 rpm, there was some induction noise
from the twin Solex carbs, above 3,500 the car became very quiet and
obviously due to the rotary engine was very smooth and vibration free.
Red sector on the rev counter starts at 6,500 RPM, a buzzer sounds at
6,800 RPM to remind the driver to change gear!!
AUDI purchased NSU in 1969 and the car became an AUDI-NSU RO80. AUDI
used the RO80 as the design for the AUDI 5000.
The 1973 oil crisis; and the fact that the rotor apex tip and side seals
often wore and the rotor housing surface also often wore meant that the
engine had a relatively short life; brought production to an early halt.
The recommended way to make the engines last longer was to add Redex to
the fuel, this was an additive that helped reduce carbon build-up and to
never rev the engine when cold and when warm, gear changing should not
take place until the rev counter was in the red sector, i.e. when warm,
the engine needed to be driven hard to last. It was Mazda that
eventually made the Wankel engine reliable.
I also owned a 1971 RO80 previously to this one and that car required a
reconditioned NSU Wankel engine to be fitted. My 1973 car was first sold
in 1975 (sales fell dramatically in 1973 due to the oil crisis) and I
purchased the car in 1978 with 10,000 miles on the clock and a worn
rotary engine. The car had been used by the first owner just for local
shopping trips, the worst possible driving for the NSU Wankel engine. I
purchased a Ford engine conversion kit and installed a brand new Ford V4
2000cc engine in the car. At the time, the Ford V4 was the only engine
that would fit in the car due to the compact size of the Wankel engine.
In 1978, the Mazda rotary engine was also not reliable and the Mazda
conversion kit was not available back then. In later years a Mazda
conversion kit became available to install either the Mazda RX7 12A,
12B, 13A or 13B engine; however this car still has the Ford engine in
it. If I had a garage, now is the time I would contemplate installing an
RX7 engine in the car. The car is right-hand drive.
An NSU RO80 in the same condition as this one with an original working
NSU Wankel engine is worth around $10,000 - $12,000 today. With the Ford
V4 engine, Im asking only $7500.
Some spare parts and a number of tools are included with the car,
including axle stands, a garage jack, 2 car ramps and an engine hoist.
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