It followed an earlier, 1964 joint venture of both companies, the Geneva-based Comobil subsidiary, focusing on the development of the engines. Comotor engines were used by the Citroën M35 and by the GS Birotor.
The venture was hamstrung by technical, reliability, and fuel consumption issues. Although Citroën took a slow and calculated development path, including a two-year 'beta-program' in which 267 Citroën M35 prototypes were tested exhaustively by selected customers, rising fuel prices in 1973 nullified market demand for the fuel-thirsty engine. The vast sums that were invested in the Comobil and Comotor joint ventures were major contributors to the bankruptcy of both NSU and Citroën.
Henk Van Veen of the Netherlands designed the OCR 1000 motorcycle around the Comotor engine. His company manufactured 38 of these motorcycles between 1974 and 1978.
- "Upheaval of an empire: How Lotz went out and Leiding came in". Autocar. 135 (nbr 3947): pages 44–47. date 25 November 1971.
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