GS prototypes

With the abandonment of Projet F in April 1967, Projet G was rushed into production. 

The budget for Project G was minimal and as much as possible had to be carried over from its still-born predecessor.

Probably the most significant legacy of Project F was Dupin’s flat four, air-cooled engine.

The Wankel engine did finally made it into production, but only 847 GS Birotors were made and the majority were subsequently bought back & crushed by Citroën, anxious to avoid provision of spares backup for a tiny number of vehicles. 

The car above is a GS prototype, housed in an Ami 6 Estate body, lowered and widened to accommodate the GS mechanical bits.

When the brief for Projet G was agreed, it was felt that an engine of less than 1 litre would not satisfy customers in the mid range market, so the 950cm3 unit was expanded to 1015cm3. An early priority was for smooth and quiet running so the cylinder head and combustion chamber was optimised with this in mind, even though fuel economy suffered as a result. 

Below are some design studies for Projet G.

Below are some design studies for Projet GY - an enlarged variant of the GS.

Studies for a coupé continued into the early 80s, together with a monocorps based on GSA running gear.