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Info

Categories
Triumph
Article
Triumph TR6 (1969-1976)
Sports Cars
Britain
1960s

Triumph TR6

1969 to 1976
Triumph TR6 motor car history
Overview
ManufacturerTriumph Motor Company
Production1969–1976
AssemblyCoventry, England
Body and chassis
ClassRoadster
LayoutFR layout
Powertrain
Engine2,498 cc (2.5 l) I6
Transmission4-speed manual all synchromesh
Dimensions
Wheelbase2,235 mm (88.0 in)
Length3,950 mm (155.5 in)
Width1,550 mm (61.0 in)
Height1,270 mm (50.0 in)
Kerb weight1,130 kg (2,491 lb)
Chronology
PredecessorTriumph TR250 (United States) Triumph TR5 (rest of the world)
SuccessorTriumph TR7

 

The Triumph TR6 (1969–76) is a British six-cylinder sports car and the best-seller of the TR range built by Triumph when production ended in July 1976. This record was then surpassed by the TR7. Of the 94,619 TR6s produced, 86,249 were exported; only 8,370 were sold in the UK.

The bodywork closely resembled that of the previous model, the Triumph TR5, but the front and back ends were squared off, reportedly based on a consultancy contract involving Karmann. This is referred to as a Kamm-style tail, which was very common during 1970s era of cars. The body shape was similar to the TR4/TR5 except for the rear and front.

Triumph TR6 side view

All TR6 sports cars featured inline six-cylinder engines. For the US market the engine was carburetted, as had been the US-only TR250 engine. Like the TR5, the TR6 was fuel-injected for other world markets including the United Kingdom, hence the TR6PI (petrol-injection) designation. The Lucas mechanical fuel injection system helped the home-market TR6 produce 150 bhp (110 kW) (145 hp DIN) at model introduction. Later the non-US TR6 variant was detuned to 125 bhp (93 kW) in order for it to be easier to drive, while the US variant continued to be carburetted with a mere (but more reliable) 104 hp (78 kW).

  • max power (DIN): 150 hp at 5.500 rpm
  • max torque (DIN): '55 1b ft. 21.8 kg m et 3.000 rpm
  • max engine rpm: 6.000
  • specific power: 60.2 hp l
  • power-weight ratio: 14.6 1b hp, 6.6 kg 'hp
  • acceleration: standing 1/4 mile 16.5 sec, 0-50 mph, (0-80 km h) 6.5 sec
  • Fuel consumption: 23 m/ imp gal. 19.1 US gal. 12.3 1 x 100 km.
  • max speeds: 37 mph. 59 in 1st gear: 58 mph, 93 kmh in 2nd gear; 88 mph, 141 kmh in 3rd gear; 125 mph. 201 km/h in 4th gear

Triumph TR6 engine view

The TR6 featured a four-speed manual transmission. An optional overdrive unit was a desirable feature because it gave drivers close gearing for aggressive driving with an electrically switched overdrive which could operate on 2nd, 3rd and 4th gears on early models and 3rd and 4th on later models because of constant gearbox failures in 2nd at high revs. Both provided "long legs" for open motorways.

TR6 also featured semi-trailing arm independent rear suspension, rack and pinion steering, 15-inch (380 mm) wheels and tires, pile carpet on floors and trunk/boot, bucket seats, and a full complement of instrumentation. Braking was accomplished by disc brakes at the front and drum brakes at the rear.

Triumph TR6 interior dash view

A factory steel hardtop was optional, requiring two people to fit it. TR6 construction was fundamentally old-fashioned: the body was bolted onto a frame instead of the two being integrated into a unibody structure; the TR6 dashboard was wooden (plywood w/ veneer). Other factory options included a rear anti-roll bar and a limited slip differential.

Triumph TR6 british 1970s sports cars

A 1975 Triumph TR6 in Wheeler Dealers Series 9

1975 Triumph TR6 Wheeler Dealers

 

Edited By
MCH
Created
18 January 2014
Updated
04 August 2023
Related items
British Automotive 1970s | British Automotive 1960s | Vehicles launched in 1969 | British Sports cars | Triumph TR Range | Karmann | Wheeler Dealers cars | Roadster | Sports Cars

Technical

Technical
  • Triumph TR6 Technical details and specifications (1969-1976)

    ENGINE
    location front
    4 stroke: cylinders: 6, in line
    bore and stroke: 2.94 x 3.74 im 74.7 x 95 mm
    engine capacity: 2.498 cu cm
    compression ratio: 9.5
    cylinder block: cast iron
    cylinder head: cast iron
    crankshaft bearings: 4
    valves: 2 per cylinder. overhead, in line, push-rods and rockers
    camshafts: 1. side
    lubrication: eccentric pump, full flow filter
    carburation: Lucas injection pump (constant pressure), injectors in inlet pipes
    fuel feed: electric pump
    cooling system: water

    TRANSMISSION
    driving wheels: rear
    clutch: single dry plate (diaphragm), hydraulically controlled
    gearbox: mechanical: gears: 4 + reverse
    synchromesh gears: all
    gearbox ratios: 1st 3.140. 2nd 2.010, 3rd 1.330. 4th 1, rev 3.220
    gear lever: central
    final drive: hypoid bevel
    axle ratio: 3.450
    (Optional) Laycock Normanville overdrive on Ill and IV (0.820 ratio)

    CHASSIS
    box-typE ladder frame. X cross members
    front suspension: independent. wishbones, coil springs. anti-roll bar telescopic dampers.
    rear suspension: independent. semi-trailing arms. coil springs, telescopic dampers.

    STEERING
    rack-and-pinion
    turns of steering wheel lock to lock: 3.25.
    turning circle (between walls): 33 ft. 10.1 m

    BRAKES
    front disc (diametor 10.85 in, 276 mm). rear drum. circuit. servo
    area rubbed by linings: front 233 sq in. 1.503 sq cm
    area rubbed by linings: rear 99 sq in, 639 sq cm
    total 332 sq in. 2.142 sq cm.

    ELECTRICAL EQUIPMENT
    voltage: 12 V
    battery: 57 A
    generator type: alternator. 408 W

    DIMENSIONS AND WEIGHT
    wheel base: 88 in. 2.235 mm:
    front track: 50.25 in. 1.276 mm: rear track: 49.75 in. 1.264 mm
    overall length: 155 in. 3.937 mm
    overall width: 58 in. 1.473 mm
    overall heiqht: 50 in. 1.270 mm
    ground clearance: 6 in. 152 mm
    dry weight: 2.194 lb. 995 kg

    © Motor car History

Service

Service
  • Triumph TR6 Service Guide (1969-1976)

    Fuel: 100 oct patrol
    Engine oil: 8 imp pt. 9.7 US pt. 4.6 1, SAE 20W.30. change every 6.000 miles, 9,700 km
    Total lubricating system capacity: 9 imp pt. 10.8 US pt
    Gearbox oil: 2 imp pt. 2.5 US
    Final drive oil: 2.5pt. 2 1. SAE 90. no chanqe recomended
    Greasing: none
    Cooling system capacity: 11 imp pt. 13.3 US pt.
    Tappet clearances: inlet 0.010 in. 095 mm. exhaust 0.010 in. 0.25 mm
    Normal tyre pressure: front 22 psi, rear 24 psi,
    Width of rims: 5.5"
    Tyres: 165 x 15
    Carrying capacity: 353 1b, 160 kg
    Fuel tank capacity: 11.2 imp gal. 13.5 US gal

    © Motor car History

Gallery

Gallery

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