Triumph TR4A
| Triumph TR4A | |
|---|---|
 |
|
| Overview | |
| Manufacturer | Triumph Motor Company |
| Production | 1965–1967 |
| Body and chassis | |
| Class | Sports car |
| Body style | 2-door roadster |
| Layout | Front engine, rear wheel drive |
| Powertrain | |
| Engine | 2,138 cc (2.1 L) I4 |
| Transmission | 4-speed manual |
| Dimensions | |
| Wheelbase | 2,235 mm (88.0 in) |
| Length | 3,962 mm (156.0 in) |
| Width | 1,473 mm (58.0 in) |
| Height | 1,270 mm (50.0 in) |
| Curb weight | 1,016 kg (2,240 lb) |
| Chronology | |
| Predecessor | Triumph TR4 |
| Successor | Triumph TR5/TR250 |
The Triumph TR4A is a sports car that was built by the Triumph Motor Company at its Coventry factory in the United Kingdom between 1965 and 1967.
The TR4A was an evolution of the TR4. While visual differences between the two were subtle, there were significant changes under the skin.
When the TR4 was introduced the styling by Giovanni Michelotti and the car's many amenities were favorably received, but the car's perceived harsh ride was not. To address this issue Triumph replaced the TR4's Hotchkiss drive system with an independent rear suspension. The change was indicated by an "IRS" badge attached to the rear of the new car.
The new rear suspension was a semi-trailing arm system with coil springs and lever-arm shocks. This system more closely resembled that of the Triumph 2000 than the swing axle systems used in the Herald or Spitfire. The chassis was redesigned to accommodate the new suspension at the rear, with extensive changes to the side members and cross-bracing. The redesign had the desired effect, with reviewers commenting on the improved ride comfort, although some felt that the car's handling had not improved.
The chassis revisions resulted in a car roughly 22 mm (0.87 in) wider than the TR4, although length and height were unaffected. The wheelbase was 3 mm (0.12 in) shorter. The front track was unchanged, while the rear track grew by 13 mm (0.51 in) with the IRS. The car was heavier by 50 kg (110 lb).
Although consideration was given to both an enlarged 2.5 liter four-cylinder or a six-cylinder engine, the TR4A used the same long-stroke, high-torque Standard four-cylinder wet-sleeve engine seen in the TR4. While the bore, stroke, and displacement remained the same, changes to the cylinder head and manifolds raised net power to 104 bhp (78 kW) and torque to 132 lb·ft (179 N·m), an increase of 10 percent.
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