Triumph GT6 MKI
|Production||1966 to 1968|
|Body style||2-door fastback|
|Related||Triumph Spitfire Triumph Herald Triumph Vitesse|
|Engine||1,998 cc (2.0 L) OHV I6|
|Transmission||4-speed synchromeshed manual with optional overdrive|
|Wheelbase||2,128 mm (83.8 in)|
|Width||1,450 mm (57 in)|
|Height||1,193 mm (47.0 in)|
The GT6 MKI is a 6-cylinder sports car which was built by Triumph. Production ran from 1966 to 1968 .The GT6 fixed head coupe that was based on the Triumph Spitfire .
The GT6 is the result of a happy marriage between the little Spitfire andthe 2000 Saloon, but in some ways it is quite different from both. The new coupé has taken the body used by the official works team or the 1964 and 1965 Le Mans 24 Hours (the power bulge on the bonnet is one difference from the Spitfire) and also the chassis and suitably strengthened suspension. The 2000 engine has been taken over, but, with the compression ratio increased to 9.5, it now develops 95 hp DIN at 5,000 rpm. Since this car weighs only 1,793 pounds (913 kg) the power-weight ratio is extremely favourable for a car of this category and results in formidable acceleration powers (from O to 50 miles per hour in under 7.8 seconds), Both for this reason and because the maximum torque is very high (117 1b ft. 16.2 kgm at 3,000 rpm) there is no need. even in town traffic, to change gear
too frequently.The suspension is independent all round, with wishbones, coil springs,like the co-axial telescopic dampers and anti-roll bar on the front, and— swinging semi-axles with a transverse semi-elliptic leafspring and Spitfire longitudinal radius rods on the rear.
With the Spitfire, Triumph introduced an affordable sports car in 1962. At the time, the competitor MG had a coupe on offer from the MGB, which sold well. Triumph therefore commissioned the Italian designer Giovanni Michelotti to also design a coupé based on the Spitfire The new body was a sleek fastback with an opening rear hatch .It was a two-seater, but a little extra back seat could be obtained if needed, and it was big enough for small kids The basic price new was £ 985 inc in the UK and just over $ 2,000 in the US . Due to the higher weight, however, the performance of the Spitfire engine proved to be insufficient in this car, which is why the 2-litre six-cylinder engine from the Triumph Vitesse was installed in the new Spitfire coupe.
The Triumph GT6 was a new car that was released in 1966. With its rear hatchback. The GT6 was well equipped. Inside that as the spifire with addition to the wooden dashboard with four instruments, it had a two-speed windshield wiper, a two-speed heater fan, a padded steering wheel and bucket seats as standard. There is
also a collapsible safety device for the steering column in case of accidents. The polished wood facia includes trip arid total mileage recorder, rev counter, temperature gauge and fuel gauge. There is no oil gauge, but a warning light comes on when the pressure falls too tow. finger-tip stalks from the steering column control indicators, overdrive and lights. The courtesy light is operated by the rear door as well as the two side doors.
The chassis as of the Spifire was double backbone, channel section with outriggers. The swing-axle system adopted from the Spitfire and the Triumph Herald small saloon.The Mk.1 model was 3717 mm long and 1450 mm wide.Front suspension was independent, wishbones, coil springs, anti-roll bar, and telescopic dampers the
rear independent, swinging semi-axles, transverse leafspring upper arms,swinging longitudinal trailing arms,and telescopic dampers.
Powered by 2 Stromberg 1-50 CD horizontal carburettors , the old 6-cylinder delivered 95 hp , thanks to the weight of only 864 kg, to undermine the original set-up (identical to that of the Spitfire ). Due to the higher weight, however, the performance of the Spitfire engine proved to be insufficient in this car, which is why the 2-litre six-cylinder engine from the Triumph Vitesse was installed in the new coupe.The enlarged 6-cylinder engine demanded a redesigned bonnet top with a power bulge, and the doors were equipped with opening quarter light windows and squared-off glass in the top rear corner, and the family resemblance to the Spitfire Mk II was evident.The 6-cylinder engine was adjusted to produce 95 horsepower (71 kW) at 5000 rpm and 117 pound-feet of torque (159 Nm) at 3000 rpm.
- engine capacity 121.92 cu in, 1,998 cu cm
- fuel consumption 25.7 mlimp gal, 21.4 ml US gal
- max speed 107 mph, 172.3 km/h
- max power (DIN): 95 hp at 5,000 rpm
- max torque (DIN): 117 1b ft, 16.1 kg m at 3,000 rpm
- max engine rpm: 6,000
- specific power: 47.5 hp/l
- power-weight ratio: 19 lb/hp, 8.6 kg/hp
- acceleration: standing 1/4 mile 17.7 sec, 0—50 mph (0— 80 km/h) 7.8 sec
The increased power necessitated certain changes to the Spitfire mechanics; the radiator was new and mounted further forward in the car and the gearbox was the stronger unit from the Vitesse, with optional overdrive. Front springs were uprated to cope with the extra weight from the new engine. The overall vehicle weight unladed was 1,904 lb (864 kg). The interior of the GT6 was well equipped; a wooden dashboard housed a full complement of instruments, with carpets and heater included as standard.
The new car had some very strong selling points. The new engine provided a 106 mph (171 km/h) top speed and 0–60 mph in 12 seconds, better than the MGB GTs rather harsh 4-cylinder engine B series engine. Fuel economy was very reasonable for the period at 20mpg, and the interior well up to the competition. The only major criticism was of its rear suspension; the GT6 inherited the swing-axle system from the Spitfire, which in turn was copied from the Herald small saloon. In the saloon it was tolerated, in the little Spitfire it was not liked and in the powerful GT6 it was heavily criticised. Triumph had done nothing to improve the system for the GT6 and the tendency to break away if the driver lifted off the power mid-corner was not helped at all by the increased weight at the front of the car. The handling was most bitterly criticised in the USA, an important export market for Triumph, where they were traditionally very strong. Similar criticism was being levelled at the Vitesse saloon, which shared the GT6's engine and its handling problems.
Triumph GT6 MkI Technical details and specifications (1966-1968)
location front, 4 stroke
cylinders: 6, in line
bore and stroke: 2.94 x 2.99 in, 74.7 x 76 mm
engine capacity: 121.92 cu in, 1,998 cu cm
compression ratio: 9.5
cylinder block: cast iron
cylinder head: cast iron
crankshaft bearings: 4
valves: 2 per cylinder, overhead, push-rods and rockers
camshafts: 1, side
lubrication: eccentric pump, full flow filter
carburation: 2 Stromberg 1-50 CD horizontal carburettors
fuel feed: mechanical pump
cooling system: water
driving wheels: rear
clutch: single dry plate, hydraulically controlled
gears: 4 + reverse
synchromesh gears: all
gearbox ratios: I 2.650, II 1.780, III 1.250, IV 1, rev 3.100
gear lever location: central
final drive: hypoid bevel
axle ratio: 3.270 (option) 3.890
(option) Laycock-de Normanville overdrive on 3rd and I4th (0.800 ratio)
type double backbone, channel section with outriggers
front suspension: independent, wishbones, coil springs, anti-roll bar, telescopic dampers
rear suspension: independent, swinging semi-axles, transverse leafspring upper arms,swinging longitudinal trailing arms, telescopic dampers.
rack-and-pinion, adjustable steering wheel
turns of steering wheel lock to lock: 4.25.
turning circle (between walls): 25 ft. 7.6 m
front disc (diameter 9.70 in, 246 mm), rear drum
area rubbed by linings: front 197 sq in, 1,270.65 sq cm
area rubbed by linings: rear 63 sq in, 406.35 sq cm
area rubbed by linings: total 260 sq in, 1,677 sq cm.
voltage: 12 V
battery: 48 Ah
generator type: dynamo, 300 W
ignition distributor: Lucas
DIMENSIONS AND WEIGHT
wheel base: 83.07 in, 2,110 mm
front track: 49.02 in, 1,245 mm
rear track: 48.03 in, 1,220 mm
overall length: 145.08 in, 3,685 mm
overall width: 57.01 in, 1,448 mm
overall height: 47.05 in, 1,195 mm
ground clearance: 4.02 in, 102 mm
dry weight: 1,793 1b, 813 kg
© Motor car History
Models production run:
Model name Engine Year Number built GT6 Mark I 1996 cc inline 6 July 1966 – Sept 1968 15,818 GT6 Mark II 1996 cc inline 6 July 1968 – Dec 1970 12,066 GT6 Mark III 1996 cc inline 6 Oct 1970 – Dec 1973 13,042
Production Total (all models): 40,926
Triumph GT6 MkI Maintenance and Service Guide (1966-1968)
fuel: 100 oct petrol
engine oil change: 8 imp pt, 9.51 US pt. 4.5 1, SAE 20W-30, change every 6,000 miles, 9,700 km
lubricating system capacity: 8.50 imp pt, 10.15 US pt
gearbox oil: 1.50 imp pt, 1.90 US pt. 0.9 1, no change recommended
final drive oil: 1 imp pt 1.27 US pt. 0.6 1, no change recommended
greasing: every 6,000 miles, 9,700 km, 4 points, every 12,000 miles, 19,300 km, 2 points
tappet clearances: inlet 0.010 in 0.25 mm, exhaust 0.010 in, 0.25 mm
valve timing: inlet opens 18° before tdc and closes 58° after bdc, exhaust opens 58° before bdc and closes 18° after tdc
normal tyre pressure: front 23 psi, 1.6 atm, rear 24 psi, 1.7 atm.
width of rims: 4.5"
tyres: 155 x 13
fuel tank capacity: 9.7 imp gal, 11.6 US gal
carrying capacity: 353 1b, 160 kg
© Motor car History
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