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From Wikipedia:
A two rotor GS was launched in 1973. Dubbed the Citroën GS Birotor (also called Citroën GZ), it featured a much more powerful 79 kW (106 hp) Wankel birotor produced by the joint NSU-Citroën Comotor project. This style of motor is noted for its smooth power delivery which complemented the luxurious ride quality of the hydropneumatic suspension. Even better, the engine was small relative to its power, an advantage for Tax horsepower calculations, which drive automobile design in France.
The Birotor was extensively reengineered for the Comotor 624 engine. Discs all around (ventilated in front), different wheels with a five-bolt pattern rather than three, and a three-speed semi-automatic transmission were combined with a more luxurious interior and flared fenders to set the Birotor apart from its lesser siblings.
The Birotor cost as much as the larger Citroën DS, and 70% more than the standard GS. The fuel economy was worse than the largest DS - the DS23EFI. So it was not economical for its size, and was launched in October 1973, the exact start of the 1973 oil crisis.
The Birotor version achieved poor sales and was quickly pulled from the market, after 847 units were sold.
The sales were so disappointing that Citroën attempted to buy back and scrap each Birotor, as it did not want to support the model with spare parts. A few of these remarkable vehicles have nonetheless survived in the hands of collectors, many without titles for some time as Citroën did not want to recognize the cars.
Specifications:
Engine: 2x497.5 cc Comotor 624 2-rotor
Horsepower: 106 HP
Torque: 101 ft-lb
Drivetrain: FF
Gearbox: 3-speed semi automatic
Weight: 1,140 kg
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