Citroën GS Biro­tor


Classics Monthly - - History -

Based on a GS bodyshell with flared front whee­larches, the GS Biro­tor was pow­ered by a twin ro­tor Wankel en­gine pro­duced by Co­mo­bil, a com­pany jointly formed be­tween NSU and Citroën and later known as Co­mo­tor.

The Biro­tor’s ro­tary en­gine was ca­pa­ble of pro­duc­ing 107bhp when the nee­dle on the tacho hit 6500rpm, a sig­nif­i­cant in­crease over the flat-four pis­ton pow­ered GS. Like its con­ven­tion­ally pow­ered sib­ling, the front-wheel drive Biro­tor had disc brakes all round and hy­drop­neu­matic self-lev­el­ling sus­pen­sion soaked up the bumps.

Al­though ru­mours in the mo­tor­ing press hinted that a ro­tary pow­ered Citroën CX was on the cards, re­li­a­bil­ity is­sues re­sulted in Biro­tor pro­duc­tion com­ing to an end in 1975. Only 873 GS Biro­tors were pro­duced and Citroën tried to buy back all the cars and de­stroy them, which means very few sur­vive.

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