Formula 1
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Constructors
Since 1981, Formula One teams have been required to build the chassis in which they compete, and consequently the terms "team" and "constructor" became more or less interchangeable. This requirement distinguishes the sport from series such as the IndyCar Series which allows teams to purchase chassis, and "spec series" such as GP2, which require all cars be kept to an identical specification. It also effectively prohibits privateers, which were common even in Formula One well into the 1970s.
The sport's debut season, 1950, saw eighteen teams compete, but due to high costs many dropped out quickly. In fact, such was the scarcity of competitive cars for much of the first decade of Formula One that Formula Two cars were admitted
to fill the grids. Ferrari is the only still-active team which competed in 1950.
Early manufacturer involvement came in the form of a "factory team" or "works team" (that is, one owned and staffed by a major car company), such as those of Alfa Romeo, Ferrari, or Renault. After having virtually disappeared by the early 1980s, factory teams made a comeback in the 1990s and 2000s and formed up to half the grid with Ferrari, Jaguar BMW, Renault, Toyota, and Honda either setting up their own teams or buying out existing ones. Mercedes-Benz owned 40% of the McLaren team and manufactures the team's engines. Factory teams currently make up the top competitive teams; in 2008 wholly owned factory teams took four of the top five positions in the Constructors' Championship, and McLaren the other. Ferrari holds the record for having won the most Constructors' Championships (fifteen). However by the end of the 2000s factory teams were once again on the decline with only Ferrari, Mercedes-Benz and Renault lodging entries to the 2010 championship.
Companies such as Climax, Repco, Cosworth, Hart, Judd and Supertec, which had no direct team affiliation, often sold engines to teams that could not afford to manufacture them. In the early years, independently owned Formula One teams sometimes also built their engines, though this became less common with the increased involvement of major car manufacturers such as BMW, Ferrari, Honda, Mercedes-Benz, Renault, and Toyota, whose large budgets rendered privately built engines less competitive. Cosworth was the last independent engine supplier, but lost
Nick Heidfeld and Nico Rosberg on the street circuit of Albert Park in the 2008 Australian Grand Prix.