Triumph TR4A

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Triumph TR4A IRS

The Triumph TR4A wis biggit 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 mair complex independent rear suspension wad 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 biggit wi IRS. In 1965, the TR4A IRS sauld in the Unitit Kinrick for approximately £968, wi wire wheels bein anither £36, owerdrive £51, heater £13 an seat belts £4 each.[1] In the Unitit States the model sauld for juist unner $2500 an accessory prices includit: heater, $64; seat belts, $17; A.M. radio; $?; toneau civer, $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 solit rear axle option (cried a live axle an aw), seemilar 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 cless at the Sebring 12-oor race o 1966. Albeit nou the live axle is superior in racin due tae its muckle better pouer tae wecht ratio, bestin the TR6 an aw.

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 lang stroke gie 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)
  • Ingine 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 tap:
  • 30 tae 50 mph (48 tae 80 km/h): 8 s
  • 40 tae 60 mph (64 tae 97 km/h): 8 s
  • 60 tae 80 mph (97 tae 130 km/h): 11 s
  1. Autocar Magazine, 28 May 1965