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Citroen GZ (GS Birotor)
In 1964 Comobil was founded as a joint venture between Citroen and NSU to develop the Wankel engine, and in 1967 Comotor was established as a join Citroen/NSU manufacturing plant for the Wankel engine. Citroen launched the M35 as its first experimental Wankel-engined car, followed by the Citroen GS Birotor (GZ), but neither car was really a production model. Launched at the 1973 Frankfurt Motor show, the GZ was heavily based on the GS. It used a twin rotor Comotor Wankel engine of 2 x 497.5cc (rated at 1990cc), which was similar to the NSU Ro80 unit but more developed by Citroen. 874 Citroen GZ were produced until the GZ 1975. The 1974 Oil Crisis killed all cars with high fuel consumption, and the Wankel engine used a lot of fuel and oil; it also gave poor emmission levels. Most GS Birotor were bought back by Citroen and cruhed.
aa_Citroen GZ 1974 badgea
Citroen GZ 1974 - GS birotor badge on front wings
 aa_Citroen GZ 1974 badgeb
Citroen GZ 1974 - Citroen GS birotor badge on bootlid
 Citroen GZ 1974 front
Citroen GS birotor. From 1973-75 Citroen built 873 Citroen GS cars with a twin rotor 1990cc Wankel engine built by Comotor the NSU-Citroen joint venture. The project failed because of engine reliability, poor fuel consumption, bad oil consumption and pollution levels.
 Citroen GZ 1974 frontf
Citroen GZ 1974. There was a lot of changed engineering under the skin of the GZ (GS Birotor) to accomodate a water-cooled Wankel engine. Underneath the GZ had more in common with the Citroen CX than the GS. Flared wheel arches are an indicator of the wider track required to fit in the engine and gearbox.
 Citroen GZ 1974 rear
Citroen GZ 1974. Cars were offered in 2 shades, Brown or Beige, and often cars arepainted in a duotone form of both colours as here where the drker colour is used for the roof.
Citroen GZ 1974 rearf
Citroen GZ 1974. Despite looking like a standard GS, the GS Birotor was much changed underneath to accomodate the engineering.
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Citroen GS and GSA
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Citroen M35 Wankel Coupe
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Wankel Rotary Engines
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key text:  This is the page introducing Simons love of cars from the website  RedSimon which is a series of photo albums of Simon GP Geoghegan.
The names of Pinin, Farina, and Pininfarina are also considered
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