The Citroen GS Birotor was launched in 1973. It featured a much more powerful 79 kW (106 hp) Wankel birotor produced by the joint NSU-CitroŽn Comotor project. This style of motor is noted for its smooth power delivery which complemented the luxurious ride quality of the hydropneumatic suspension. To fit the engine in the GS body the car was extensively re-engineerd. The suspension shares a lot of characteristics with it's bigger sister the Citroen CX. The GS Birotor has disks all round and wider wheels and tyres. The engine is mated with the smooth 3-speed C-matic semi-automatic transmission. When launched the Birotor costs as much as the larger Citroen DS and about 70% more than a standard GS. The high costs of buying a Birotor combined with the start of the oil crisis lead to very poor sales. Citroen quickly pulled the car from the marked after only about 850 cars were sold. Then to avoid having to support the car with maintenance and parts Citroen tried to buy back or trade in all Birotors.
This GS Birotor has been in a French barn about 25 years and the resulting patina is wonderful. As seen on the pictures, the gold paint has faded and grey primer is visible. There are some minor surface rust spots in the sheet metal, but nowhere is rusted through. The floor has some dents and some surface rust. The original bitumen is peeling off in places. There is no rot in any of the doorshuts, under the headlights, in the front valance or any of the other usual places. The interior is in reasonably good condition. The seats have been attacked in places by moths and have become slightly baggy. All plastic parts are present and in good condition.
The following components are renewed or rebuild:
All fluids changed
New Oil filter
Fuel tank and piping cleaned
New electric fuel pump
All fuel hoses renewed
Oil / fuel mixer reconditioned
Water hoses replaced as needed
Steel pipes in cooling system replaced by aluminium
Water pump overhauled
Air pump Rebuild
New Handbrake cables
Original spheres regassed
Hydraulic lines and hoses replaced, where necessary,
Reconditioned HD pump
Brakes checked over
New rear brake pads
New Correct Michelin tires
Rims powder coated
Ignition checked and adjusted
Ignition control boxes checked and tested
All vacuum hoses replaced
New Spark plugs and leads
New Fan belts
New SEV Marchal Amplilux headlights
New Stainless steel silencers
New Green tinted windscreen
New Wiper blades
After all the work done to this car it drives again as intended. The engine is running smoothly
and pulls the car effortlessly. The engine does not smoke at all once warmed up. The C-matic transmission shifts smoothly. The suspension rides very comfortably without any knocks or creaks. The brakes pull up straight. The GS is registered in the UK and MOTed. All in all this GS is ready for the next enthusiast to enjoy. I'll be looking again for another project, I'm always interested in an interesting trade in to add to my collection of unique Citroens. I have a load more pictures of the car now and during the recommissioning. Please send me an emails for more information.
This car featured in the October issue of 'Classic & Sports Car' magazine's Case Histories
1,911 CC, 46 HP, 4 CYLINDER, TRACTION AVANT, FRESHLY PAINTED, NEW WHEELS, CHROME JUST MADE, EXCELLENT CONDITION AND PERFORMANCE, COMPLETE RESTORATION, HISTORICAL REGISTRATION, ITV EVERY 5 YEARS. MORE INFORMATION: http://antequeraclassic.com/citroen_11_bl.htm
A two rotors GS was launched in 1973. Dubbed the Citroën GS Birotor, it featured a much more powerful 107 PS (79 kW) Wankel birotor produced by the joint NSU-Citroën Comotor project.
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