The Triumph TR3 is a British sports car produced from 1955 to 1962 by the Standard Motor Company of Coventry, England. A traditional open two-seater, the TR3 is an evolution of the company's earlier TR2 model, with greater power and improved braking. Updated variants, popularly but unofficially known as the "TR3A" and "TR3B", entered production in 1957 and 1962 respectively. The TR3 was succeeded by the mechanically similar, Michelotti-styled Triumph TR4.
The rugged ‘sidescreen’ TR, so named for its use of removable plexiglass side curtains, was a sales and motorsport success. With approximately 74,800 TR3s sold across all variants, the model was the company's third best seller in the TR range, behind the TR7 (111,500 units) and TR6 (94,500 units) models.
TR3 (1955–1957)
Although the base car is an open two-seater, an occasional rear seat and bolt-on steel hard top were available as extras.
The TR3 is powered by a 1991 cc Standard wet liner engine. This OHV straight-four initially produced 95 bhp, an increase of 5 hp over the TR2 thanks to larger SU H6 carburettors. This was later increased to 100 bhp at 5000 rpm by the addition of a "high port" cylinder head and enlarged manifold. The four-speed manual gearbox could be supplemented by an electrically engaged overdrive, controlled by a switch on the dashboard.