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| Triumph TR4A | |
|---|---|
.JPG?lang=en) | |
| Overview | |
| Manufacturer | Triumph Motor Company |
| Production | 1965–1967 |
| Body and chassis | |
| Class | Sports car |
| Body style | 2-door roadster |
| Layout | FR layout |
| Powertrain | |
| Engine | 2,138 cc (2.1 L) I4 |
| Transmission | 4-speed manual[1] |
| Dimensions | |
| Wheelbase | 2,235 mm (88.0 in)[1] |
| Length | 3,962 mm (156.0 in)[1] |
| Width | 1,473 mm (58.0 in)[1] |
| Height | 1,270 mm (50.0 in)[1] |
| Curb weight | 1,016 kg (2,240 lb)[1] |
| Chronology | |
| Predecessor | Triumph TR4 |
| Successor | Triumph TR5/TR250 |
The Triumph TR4A is a sports car that was built by the Triumph Motor Company in the United Kingdom between 1965 and 1967.[2]
The TR4A was an evolution of the TR4. Although a casual observer might be hard-pressed to differentiate between the TR4 and TR4A, 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 complaints were made about the car's harsh ride. To address this issue Triumph replaced the TR4's Hotchkiss drive system with an independent rear suspension, as indicated by an "IRS" badge attached to the rear of the new car.
The rear suspension in the TR4A was a semi-trailing arm system with coil springs. Lever-arm shocks were retained due to space restrictions. This system more closely resembled that of the Triumph 2000 than the swing axle systems used in the Triumph Herald or Triumph Spitfire. The chassis was redesigned to accommodate the new suspension at the rear, and the formerly straight side members were replaced with angled elements. 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.<ref?>
The changes to the chassis resulted in an increase in overall width, with the car now roughly 2 - 2.5 inches wider although length and height were unaffected. The front track was unchanged, while the rear track grew by ??? inches with the IRS. The car was heavier by ??? kg.<ref?>
The engine was the same long-stroke, high-torque Standard four-cylinder wet-sleeve engine used in the TR4. Specifications were ???.
Apart from the increase in width and the IRS badge on the rear of the car, visual differences included a revised grille, a chrome/brightwork line running down the flank and terminating at the front of the car with integrated signal/marker lights, which were moved from their earlier position in the corners of the grille. Inside the car the formerly white painted steel dashboard was now clad in wood.<ref?>
In 1965 the TR4A IRS sold in the UK for approximately £968. Wire wheels added £36, overdrive £51, heater £13 and seat belts £4 each;.[3]
In response to requests from its United States dealers ??? names ???<ref?>, Triumph developed a version of the TR4A that came with a rear live axle, just like the TR4. To locate the newly re-introduced leaf springs, spring brackets were added to the revised chassis. In this market IRS was available as an extra-cost option.<Ref?> The price in the United States was just under $2500.
In 1968 the four-cylinder TR4A was replaced by a new 6-cylinder Triumph roadster. In the UK and other markets the new model was named the TR5 and was equipped with ??? fuel injection). In the United States the new car was called the TR250, and came with and twin SU carburetors. The cars were otherwise identical.
In Q1 2011 there were approximately 789 licensed and 153 SORN TR4As registered with the DVLA.[4][5]
Coachwork
The TR4A continued to be available with the "Surrey Top" hard top system. This weather protection system with rigid rear section including the rear window and removable fabric section over the driver's and passenger's heads. This aesthetically foreshadowed the silhouette of Targa top cars.
Motorsports
While the factory did not campaign the TR4A aggressively, the new suspension was able to prove itself on the racetrack. Three TR4A IRS models posted a team win and finishing 1st, 2nd and 3rd in class at the Sebring 12-hour race of 1966.
In the United States, even though the SCCA declined to ??? the TR4A, Kas Kastner and his modified TR4A were able to win a D-modified National Championship in 196?, and Group 44 successfully campaigned one of these cars during the 1966-67 seasons, just falling short of a National SCCA Championship in D Production.
Specifications
- Engine: 2,138 cc (130.5 cu in), 4 cylinders inline, 86 mm bore, 92 mm stroke, 9:1 compression ratio, 104 bhp (78 kW).Standard inline-four engine
- Turning circle: 10.1 m (33 ft)
- Capacities:
- Fuel tank: 53.4 L (11.75 imp gal; 14.11 US gal)
- Engine sump: 6.2 L (1.36 imp gal; 1.64 US gal)
- Gearbox: 0.85 L (0.19 imp gal; 0.22 US gal)
- Acceleration in top:
- 30 to 50 mph (48 to 80 km/h): 8 s
- 40 to 60 mph (64 to 97 km/h): 8 s
- 60 to 80 mph (97 to 129 km/h): 11 s
References
- ^ a b c d e f "1965 Triumph TR4A". carfolio.com. Retrieved 2008-01-01.
- ^ Piggott, Bill (2003). Haynes Great Cars: Triumph TR. Haynes. p. 104. ISBN 185960997X.
- ^ Autocar Magazine, 28 May 1965
- ^ "How Many Left web site". www.howmanyleft.co.uk. Retrieved 2011-07-17.
- ^ "Vehicle licensing statistics". Department of Transport. Retrieved 2011-07-17.