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Triumph TR3
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Triumph TR3
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.
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 1,991 cc (121.5 cu in) Standard wet liner engine. This OHV straight-four initially produced 95 bhp (71 kW; 96 PS), 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. In 1956, the front brakes were changed from drums to discs, a first for a British series production car.
Front suspension is by double wishbones, manganese bronze trunnions, coil springs and telescopic dampers, with an optional anti-roll bar.
Steering is a worm and peg system. Unlike MGs of the same period, the steering mechanism and linkage have considerable play and friction, which increase with wear.[citation needed]
The rear suspension comprises leaf springs, a beam axle, and lever arm dampers. The (box) frame rails are slung under the axle. Wheels are 15 inches in diameter and 4.5 inches wide (increased from 4 inches after the first few TR2s), with 48-spoke wire wheels optional. Wire wheels were usually painted, either body colour or argent (silver), but matte chrome and bright chrome were also available.
Under most conditions the car is responsive and forgiving, but it has some handling issues.[citation needed] The chassis, which is shared by the TR2, TR3, TR3A, TR3B, and TR4, has limited wheel travel. As a result, on very hard cornering, the inside rear wheel can lift, causing sudden oversteer due to the increased load on the outside rear tyre. This is particularly true with radial tyres; the original TR2/3/3A suspension was built for crossply tyres. The wheel lifting is more sudden than that of other cars, because it is caused by coming to the end of the suspension travel while there is still load on the tyre, so the load on the other (outside) rear wheel is a discontinuous function of cornering load, rather than just changing slope.
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Triumph TR3
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.
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 1,991 cc (121.5 cu in) Standard wet liner engine. This OHV straight-four initially produced 95 bhp (71 kW; 96 PS), 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. In 1956, the front brakes were changed from drums to discs, a first for a British series production car.
Front suspension is by double wishbones, manganese bronze trunnions, coil springs and telescopic dampers, with an optional anti-roll bar.
Steering is a worm and peg system. Unlike MGs of the same period, the steering mechanism and linkage have considerable play and friction, which increase with wear.[citation needed]
The rear suspension comprises leaf springs, a beam axle, and lever arm dampers. The (box) frame rails are slung under the axle. Wheels are 15 inches in diameter and 4.5 inches wide (increased from 4 inches after the first few TR2s), with 48-spoke wire wheels optional. Wire wheels were usually painted, either body colour or argent (silver), but matte chrome and bright chrome were also available.
Under most conditions the car is responsive and forgiving, but it has some handling issues.[citation needed] The chassis, which is shared by the TR2, TR3, TR3A, TR3B, and TR4, has limited wheel travel. As a result, on very hard cornering, the inside rear wheel can lift, causing sudden oversteer due to the increased load on the outside rear tyre. This is particularly true with radial tyres; the original TR2/3/3A suspension was built for crossply tyres. The wheel lifting is more sudden than that of other cars, because it is caused by coming to the end of the suspension travel while there is still load on the tyre, so the load on the other (outside) rear wheel is a discontinuous function of cornering load, rather than just changing slope.
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