Triumph GT6

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Triumph GT6
1973.triumph.gt6.red.arp.jpg
Overview
Manufacturer Standard-Triumph
Production 1966–73
Body and chassis
Class Sports car
Body style 2-door fastback
Layout FR layout
Related Triumph Spitfire
Triumph Herald
Triumph Vitesse
Powertrain
Engine 1,998 cc (2.0 L) OHV I6
Transmission 4-speed synchromeshed manual with optional overdrive
Dimensions
Wheelbase 2,128 mm (83.8 in)
Length Mk 1 3,717 mm (146.3 in)
Mk 2/Plus 3,734 mm (147.0 in)
Mk 3 3,785 mm (149.0 in)
Width Mk 1/2/Plus 1,450 mm (57 in)
Mk 3 1,486 mm (58.5 in)
Height 1,193 mm (47.0 in)

The GT6 is a 6-cylinder sports coupé which was built by Standard-Triumph and based on their popular Triumph Spitfire convertible. Production ran from 1966 to 1973.[1]

Development history[edit]

In early 1963 Giovanni Michelotti was commissioned by Standard-Triumph to design a GT version of their recently introduced Spitfire 4 (also designed by Michelotti).[1] An unmodified Spitfire 4 was delivered to Michelotti's design studios in Italy and late in 1963 the prototype Spitfire GT4 was returned to England for evaluation. The styling of the vehicle was a success but the extra weight of the GT bodyshell resulted in extremely poor performance, with the 1,147 cc (70 cu in) Spitfire power unit, and plans for producing the Spitfire GT4 were shelved.

Michelotti's fastback design for the Spitfire GT4 prototype was (for the 1964 season) adopted by the Triumph racing programme as it was deemed to provide an aerodynamic benefit over the standard Spitfire body shape. Fibreglass copies of the Spitfire GT4's fastback were grafted on to the race-modified Spitfires destined for competition. The Spitfire racing programme was successful,[1] and in 1965 resulted in 13th overall and a 1st in class at the prestigious 24 Hours of Le Mans (beating their main rivals, the MG Midgets). The Spitfire's competitive success and the continuing commercial success of the production vehicle led Triumph to re-evaluate its shelved plans for a GT version of the Spitfire. To overcome the lack of performance inherent in the heavier body-style the Spitfire's 4-cylinder engine was replaced with the more powerful 2-litre (1998 cc) 6-cylinder engine from the Triumph Vitesse (which shared a similar chassis with the Spitfire and Triumph Herald). The car was further developed and refined and eventually launched as the Triumph GT6 (dropping the "Spitfire" prefix) to emphasise its GT styling and its 6-cylinder engine.

Contemporary Triumph marketing advertised the GT6 as being developed from the "race winning Le Mans Spitfires" to capitalize on their aesthetic similarities, whereas the Le Mans Spitfires and the GT6 were actually two entirely separate development programmes (the GT programme pre-dating the racing programme). However, the marketing spin was so successful that many people erroneously believed the Le Mans Spitfires to actually be GT6s.

Models[edit]

The following models were produced during the production run:

Model name Engine Year Number built
GT6 Mark I 1996 cc inline 6 July 1966 – Sept 1968 15,818[1]
GT6 Mark II 1996 cc inline 6 July 1968 – Dec 1970 12,066[1]
GT6 Mark III 1996 cc inline 6 Oct 1970 – Dec 1973 13,042[1]

Production Total (all models): 40,926[1]

GT6 Mk I[edit]

1968 Triumph GT6 (North America)

The new car was introduced in 1966 and called the Triumph GT6. The new body was a sleek fastback design with an opening rear hatch (This gave the GT6 the nickname "Poor man's E-Type".)[2] It was really a 2-seater, but a small extra rear seat could be ordered if required and was large enough for small children. The family resemblance to the Spitfire Mk II was strong, the longer 6-cylinder engine necessitated a new bonnet top with a power bulge and the doors were provided with opening quarter light windows and squared-off glass in the top rear corner. The 6-cylinder engine was tuned to develop 95 bhp (71 kW) at 5000 rpm, and produced 117 lb·ft (159 N·m) of torque at 3000 rpm. 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,[1] a little better than the MGB GT. Moreover, the unit was comparatively smooth and tractable, in marked contrast to the MG's rather harsh 4-cylinder engine. Fuel economy was very reasonable for the period at 20mpg,[1] 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.

GT6 MK II (GT6+)[edit]

1970 Triumph GT6+ Mk II (North America)

Triumph realized that they needed to find an answer to the problem, if only to keep their reputation in the USA. Their response came with the 1969 model year, with the introduction of the GT6 Mk II, known in the States as the GT6+. The rear suspension was significantly re-engineered using reversed lower wishbones and rotoflex driveshaft couplings, taming the handling and turning the Triumph into an MGB-beater. The Vitesse was also modified, but the Spitfire had to wait until 1970 for any improvements to be made.

There were other changes for the MK2: the front bumper was raised (in common with the Spitfire Mk.3) to conform to new crash regulations, necessitating a revised front end, and side vents were added to the front wings and rear pillars. Under the bonnet, the engine was uprated to develop 104 bhp (78 kW) with a new cylinder head, camshaft, and manifolds.[1] Performance improved to 107 mph (172 km/h), but perhaps more noteworthy the 0 to 60 mph (97 km/h) time dropped to 10 seconds.[1] The fuel economy was also improved to 25 mpg-imp (11 L/100 km; 21 mpg-US) average.[1] The interior was also updated with a new dashboard and better ventilation, a 2-speed heater fan and a black headlining. Overdrive remained a popular option for the manual transmission.

GT6 Mk III[edit]

1974 Triumph GT6 Mk III

The final major facelift for the GT6 came in 1970, to make the MK3. This time the whole bodyshell was revised to match the changes made to the Spitfire Mk IV; these included a cut-off rear end, recessed door handles and a smoother front end. Only detail changes were made to the mechanics, but in 1973 – close to the end of the car's production life – the rear suspension was changed again, this time for the cheaper (but still effective) "swing-spring" layout also fitted to the Spitfire Mk IV. This was a modification of the swing axle rear suspension used on the lesser Herald-derived models, with the transverse leaf spring mounted on a pivot, eliminating roll stiffness at the rear, and thus greatly reducing the jacking effect under cornering loads. To compensate for this loss of roll stiffness, a larger front anti-roll bar was fitted. A brake servo was also added in 1973, and seats were changed from vinyl to cloth. There was still a fairly comprehensive options list, but the "knock-on" wire wheels were no longer available. The unladen weight increased slightly to 2,030 lb (920 kg).[1]

Engine power and torque for the Mk III was similar to the Mk II, but better aerodynamics led to a new top speed of 112 mph (180 km/h) and a 0–60 mph time of 10.1 seconds;[1] this was now comfortably ahead of the MGB GT, which topped out at about 105 mph (169 km/h) and reached 60 mph in approximately 13 seconds. Fuel economy was also improved to 28 mpg-imp (10 L/100 km; 23 mpg-US).[1] The last USA models performed comparatively poorly however, as compression ratios were lowered to accommodate lower octane unleaded gasoline.

The Mk III never sold in the numbers hoped for by Triumph, and was comprehensively beaten in the marketplace by the MGB. Triumph refused to release an official convertible version of the GT6 and, after poor sales, it was dropped from the Triumph range at the end of 1973, although a few cars were sold the following year.

Diecast models[edit]

  • Vitesse produced a 1/43 scale model of the Mk III in the 2000s.
  • Spark produced a 1/43 scale model of the Mk II in 2010.

References[edit]

  1. ^ a b c d e f g h i j k l m n o Robson, Graham (1982). Triumph Spitfire and GT6. London: Osprey Publishing. ISBN 0-85045-452-2. 
  2. ^ Dredge, R. (July 2003). "GT6: the poor man's E-type". Practical Classics: 124–29. 

Further reading[edit]

  • Triumph GT6 and Vitesse Workshop Manual (Fifth issue, Third amendment ed.). Standard-Triumph Service Division. 

External links[edit]