|1969 to 1976|
|Manufacturer||Triumph Motor Company|
|Body and chassis|
|Engine||2,498 cc (2.5 l) I6|
|Transmission||4-speed manual all synchromesh|
|Wheelbase||2,235 mm (88.0 in)|
|Length||3,950 mm (155.5 in)|
|Width||1,550 mm (61.0 in)|
|Height||1,270 mm (50.0 in)|
|Kerb weight||1,130 kg (2,491 lb)|
|Predecessor||Triumph TR250 (United States) Triumph TR5 (rest of the world)|
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.
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
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.
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.
A 1975 Triumph TR6 in Wheeler Dealers Series 9
Triumph TR6 Technical details and specifications (1969-1976)
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
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)
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.
turns of steering wheel lock to lock: 3.25.
turning circle (between walls): 33 ft. 10.1 m
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.
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
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
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
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