Établissements Monopole was founded in 1920 in Poissy, France, with American investment capital as an offshoot of Établissements SIM SA, a Swiss foundry and machine shop. Managed by a Mr. Guerne, the company specialized in manufacturing pistons, piston-rings, valves, and other engine components. In 1937–38, majority ownership was acquired by André Hémard, of the distilling firm Hémard Fils. Following World War II, in 1944, Hémard installed his son-in-law, Jean de Montrémy, as Chief Executive Officer. De Montrémy, previously with aeronautical parts manufacturer Bronze-Avia, steered the company toward motorsport as a means of both product testing and promotion. His sons, Jean and Pierre Hémard, also held positions within the company. A series of mergers followed, including with Floquet sparkplugs, valve maker Jeudy, gudgeon pin maker Marty, and piston maker Nova, eventually leading to the company being acquired by Dana Incorporated in 1978. By 1998, the Floquet Monopole name was phased out in Europe, becoming known as Perfect Circle, but a former licensee purchased the rights to the name and established Floquet Monopole Industrie de Précision in Fes, Morocco.
De Montrémy designed the first racing Monopole himself, based around the chassis and engine of a Simca 8, but fitted with lightweight aluminium bodywork. This car debuted in 1947. Subsequent Simca-Monopoles (built in 1948 and 1949) retained the Simca 8 engine but featured custom-built lightweight chassis. In 1950, Monopole began collaborating with Panhard, utilizing their air-cooled flat-twin engine and front-wheel drive chassis from the Dyna X. These cars, designed by Pierre Bourdereau, were compact and often referred to as “tanks” due to their full-width ponton-style bodywork. The naming convention for these Panhard-based racers followed the Dyna X model series (X84, X85, X86, X87). Later, Panhard directly produced racing versions (X88, X89, VM5), with Monopole continuing to develop and race them, particularly after Panhard withdrew from direct racing involvement in 1956. A final racing model, the Monopole-Oliveira Formula Junior, was built in 1958 by Monopole technician José Carvallo de Oliveira, using the same flat-twin engine and front-wheel drive layout as the earlier sportscars.
Jean de Montrémy himself was a frequent driver for Écurie Monopole, often partnered with Eugène Dussous. Other notable drivers included his brothers-in-law, Jean and Pierre Hémard, as well as Pierre and Robert Chancel, Pierre Flahault, Yvonne Simon, and Jean Vinatier. The team increasingly relied on these drivers for endurance events.
Monopole achieved early success with the Simca-Monopole, winning its class at the 24 Hours of Le Mans in 1949. In 1952, the team won both the Index of Performance and the eighteenth Biennial Cup at Le Mans, a feat they repeated for three consecutive years. Following Panhard’s direct involvement in racing in 1953, Écurie Monopole became Panhard’s officially supported racing team in 1956, receiving both staff and cars. However, the team was closed at the end of the 1958 season, partly due to a shortage of sportscar events.
The Monopole name, as a racing entity, is defunct. However, the name survives through Floquet Monopole Industrie de Précision in Morocco, a company formed by a former licensee. The original manufacturing operations were absorbed into Perfect Circle and later sold to Mahle.
Monopole’s racing efforts demonstrated the durability of its engine components under demanding conditions, contributing to the company’s reputation within the automotive industry. The team’s success with Panhard, both during Panhard’s direct involvement and as their supported team, represents a significant chapter in French motorsport history. The Monopole-Oliveira Formula Junior, fully restored, continues to appear at historic racing events.
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