Triumph TR4A

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Triumph TR4A IRS

The Triumph TR4A wis built atween 1965 an 1968 bi the Triumph Motor Company in the Unitit Kinrick.

The TR4A wis an evolution o the TR4, updatit wi a new chassis. It wis hoped the new, but more complex independent rear suspension woud address the buyin publics' desire for mair comfortable ridin sports caurs. This version haes an "IRS" badge on the rear. It's estimatit 75% o TR4A wur built wi IRS. In 1965, the TR4A IRS sold in the Unitit Kinrick for approximately £968, wi wire wheels being anither £36, owerdrive £51, heater £13 an seat belts £4 each.[1] In the Unitit States the model sold for juist unner $2500 an accessory prices includit: heater, $64; seat belts, $17; A.M. radio; $?; toneau cover, $35, W/S washer; $10. ootside mirror;$5.50 an battery box; $5.95

In response tae dealer requests, approximately 25% o TR4As wur produced wi a solid rear axle option (also called a live axle), similar tae the earlier TR4. The TR4A wis the first vehicle tae ever offer an option for axle type.

The new suspension eventually proved itself wi the buyin public an in racin, wi three TR4A IRS models postin a team win an finishin 1st, 2nt an 3rd in class at the Sebring 12-hour race o 1966. Albeit nou the live axle is superior in racin due tae its muckle better pouer tae weight ratio, also bestin the TR6.

In 1968 the TR4A wis replaced bi the 6-cylinder TR5 (European model wi fuel injection) an TR250 (U.S. model wi twin carburetors), baith o which continued tae uise the same body design.

Specifications[eedit | eedit soorce]

Ingine: 2138 cc, 4 cylinder, 86 mm bore, 92 mm stroke, 9:1 compression ratio, 104 bhp (78 kW). The long stroke give this ingine muckle o its torque.

  • 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 130 km/h): 11 s
    • Autocar Magazine, 28 May 1965