Motorcycle specifications Koehler-Escoffier1000 1927 The French Brough

While the interwar motorcycling world was dominated by English, German and American machines, one French brand, Koehler-Escoffier, created a motorcycle capable of competing with the best of its time. The Koehler-Escoffier 1000, nicknamed the "4-tube" for its most famous version, was no mere motorcycle; it was a masterpiece of French engineering, a record-breaking machine whose name still resonates in international collectors' circles.

The brand was inspired by the success of its 500 cm3 "Mandoline" V-engine to create an even more ambitious model. Thus, in the 1920s, the Koehler-Escoffier 1000 appeared, a machine designed for racing drivers and speed enthusiasts looking for an alternative to the British Brough Superior or American Indian.

A French-style V-Twin

At the heart of the Koehler-Escoffier 1000 was a 980 cm3 V-twin engine, an architecture that echoes the most powerful machines of the era. But what set the French engine apart wasn't just its displacement; it was its engineering.

The 1000's V-twin, with its 45° angle, was a piece of mechanical goldsmithery. Cast-iron cylinders and cylinder heads housed a sophisticated timing mechanism. Valves were actuated by a simple overhead camshaft (SOHC) driven by a shaft and bevel gears, a technically advanced solution for the time.

The most famous model, and the most prized by collectors, is the "4-tube" version. Its nickname derives from its four exhaust manifolds, two per cylinder. The engine was powered by AMAC carburetors and dry-sump lubrication, a technique generally reserved for racing bikes. Although exact power figures vary according to source and version, it is estimated that it produced around 35 hp in its initial configuration. However, competition versions, specially prepared for record-breaking events, are said to have achieved much higher outputs, with some reports mentioning up to 78 hp using special fuels such as alcohol, a common practice for racing machines at the time.

Speed and elegance

The Koehler-Escoffier 1000 wasn't just powerful; it was also fast. One of its greatest ambassadors was legendary racer Georges Monneret, nicknamed "Jojo La Moto", who smashed numerous records with a competition version of the 1000. Some sources report speeds in excess of 200 km/h, an extraordinary performance for a machine of the era.

M.Bi- Image credits: BMW Group Classic /Concorso d'Eleganza Villa d'Este 2019