The Simca Poissy engine, commonly known as the Simca 1100 engine, was a four-cylinder Overhead valve engine developed by Simca for use in its superminis and economy cars, designed by the engineer Georges Martin (V12 Matra Sports engine designer). In spite of its common name, the engine actually predates the Simca 1100 model, and debuted in 1961 in the Simca 1000 Coupé. It was developed and produced by Simca (subsequently rebranded as Talbot) in the late 1960s at the manufacturer's factory in Poissy, hence its name. The engine was first designed in a form, but was reduced and stretched in order to be used in a variety of models and versions, by Simca, the Rootes Group (its partner company in Chrysler Europe), Simca's final incarnation Talbot and its last parent company Peugeot, who used it until 1991 in its midsize model, the 309. The engine existed in displacements ranging from , the biggest one on both sides of the Atlantic, powering the United States-market Dodge Omni/Plymouth Horizon. Peugeot eventually dropped the engines, replacing them with their own TU family. Poissy engine The Poissy engine was introduced in 1961 in the Simca 1000, a small four-door saloon car. It featured a displacement of and had an initial output of , which would be increased over the years to a maximum of on the base model. The following year, the 315 was used for the first time in a two-door sports model, the Simca 1000 Coupé, in a tuned form, with . The overhead valve engine Type 315 was a modern unit, with a water-cooled inline design with forged crankshaft, alloy cross-flow head and five main bearings. An unusual feature on early models was the absence of a spin-on paper oil filter. Instead, the engine featured a form of centrifugal oil filter in the hollow rear crankshaft pulley, although all later versions used the more traditional disposable cartridge filters. One of its major innovations was the use of a swirl vortex on the intake valve port which gave very good combustion, and thus both power and economy for this time. This engine proved cheap to build, and several models of different sizes and market segments used this displacement, which survived until 1982, as the ever-present entry level for the Simca 1100. In later life however, when it was installed in cars such as the Horizon and 1307/Alpine/Solara the Poissy engine was criticized