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Raymond Siran, Cyclecars D'Yrsan was a French manufacturer of automobiles in the cyclecar class. Raymond Siran, Cyclecars D'Yrsan war ein französischer Hersteller von Automobilen.

The business
Raymond Siran de Cavanac, who previously had worked with the Levallois-Perret based automobile manufacturer S. Sandford, founded his own business in 1923 at Asnières-sur-Seine, concentrating on small cyclecar style vehicles under the D’Yrsan name, with three or four wheels. On the three wheelers the single wheel was placed at the back.

Production ended in 1930.

Raymond Siran de Cavanac, der zuvor bei Sandford tätig war, gründete 1923 das Unternehmen in Asnières-sur-Seine und begann mit der Produktion von Automobilen. Der Markenname lautete D’Yrsan. 1930 endete die Produktion.

Three wheels
The three wheelers with which the business started lossely resembled the three-wheeler Morgans of the same period. Power for the D’Yrsan "Model A" came from a Ruby 4-cylinder 6 HP side-valve engine of 904cc.

Exhibited at the 19th Paris Motor Show in October 1924 for the 1925 model year the "Model A" was complemented by the D’Yrsan "Model BS", its engine size increased to 972cc, now featuring overhead valves. Both models sat on a 2470 mm wheelbase wheelbase. With "Torpedo" format bodies they were, in October 1924,m priced by the manufacturer at 9,650 francs and 10,500 francs respectively.

Later came the D’Yrsan "Model DS" with 1097cc for which a maximum output of 35 hp was listed.

In total D’Yrsan produced 530 three-wheelers, most of which were examples of the "Model BS".

Dreirad
Anfangs wurden Dreiräder produziert, bei denen sich das einzelne Rad hinten befand. Diese Fahrzeuge ähnelten den Dreirädern von Morgan. Für den Antrieb sorgte ein Vierzylindermotor von Ruby mit zunächst 904 cm³ Hubraum im Modell A, ab 1926 im Modell BS mit 972 cm³ Hubraum. Später erschien noch das Modell DS mit 1097 cm³ Hubraum und 35 PS Leistung. Insgesamt entstanden 530 Dreiräder, die meisten davon der BS.

Four wheels
For 1927 the D'Yrsan "Grand Sport" with four wheels was added to the range. The engine was the 1097cc unit bought in from Ruby. About 50 four wheelers were produced.

Vierrad
1927 erschien zusätzlich ein Modell mit vier Rädern, das ebenfalls mit einem Einbaumotor von Ruby ausgestattet war. Davon wurden 50 Exemplare gefertigt.

Competition
With sales volumes remaining modest, the manufacturer sought to make the D’Yrsan name better known by entering a car in the June 1929 24 Hours of Le Mans race. A car was entered, but unfortunately had to retire after nine laps, having completed fewer than 150 km (93 miles).

Reading list

 * Harald Linz, Halwart Schrader: Die Internationale Automobil-Enzyklopädie. United Soft Media Verlag, München 2008, ISBN 978-3-8032-9876-8. (German)
 * George Nick Georgano (Chefredakteur): The Beaulieu Encyclopedia of the Automobile. Volume 3: P–Z. Fitzroy Dearborn Publishers, Chicago 2001, ISBN 1-57958-293-1. (English)
 * George Nick Georgano: Autos. Encyclopédie complète. 1885 à nos jours. Courtille, Paris 1975. (French)

Sources and notes
Category:Defunct motor vehicle manufacturers of France Category:Companies established in 1923 Category:Communes of Hauts-de-Seine