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Triumph Stag (1970 - 1977)

Last updated 15 March 2017


Model Timeline

March 1964
First thoughts - Michelotti decides to build a Triumph 2000-based special

The cars : Triumph Stag development history

Giovanni Michelotti asked Triumph design chief, Harry Webster, whether it would be possible possible for the company to donate a used example of the recently-launched Triumph 2000. The reason for this request was simple – Michelotti wanted to produce a glamorous one-off motor show special and use it as a showcase for the emerging designer’s talents.

Given the relationship between the Michelotti and Triumph was rock solid by this time, Webster said that he would gladly hand over one of the company’s race support cars after it had finished with the car. There was a proviso, though: if Triumph liked the design, then it would have first refusal on putting it into production.

In June of that year, Triumph duly delivered its 2000 following the Le Mans 24-hour race – and now it was up to Michelotti exercise his creative talents.

May 1965
Michelotti designs a roofless two-door grand tourer

Triumph Stag

Michelotti’s original 1965 convertible based on a shortened Triumph 2000 floorpan would prove an irresistible proposition for Harry Webster.

The car Michelotti produced was based on a shortened version of the 2000′s floorpan. The main difference was that the convertible had several inches cut from the wheelbase in order to give the car more balanced proportions. The engine, gearbox and suspension were stock Triumph 2000 items – and had already seen plenty of action in their former life as a race support car.

The concept car’s frontal styling was certainly a departure from Michelotti’s then current lineup, but in time, the look would emerge to become the family ‘face’ of Triumph.

June 1965
Triumph takes on the 'Stag' project to develop to production

Needless to say, the handsome two-seater convertible easily won over Webster – and the project was taken over by Triumph for a full in-house development programme. Michelotti was never even given the opportunity to publicly show the car at the Turin Motor show, such was Triumph’s keenness to keep the stylish car to itself. Early in 1966, work on the car began at Triumph’s headquarters in Canley, under the project name, ‘Stag’.

The reason for the delay between Triumph grabbing the car and the development programme getting underway was because of Canley’s limited resources. Harry Webster put it in these terms: “It was the usual problem of priorities, and money to tool it. I’m afraid it had to wait – we were particularly preoccupied with cars like the 1300 and TR5 at the time, and of course with the development of new engines.”

Another view of the Michelotti prototype - and the two men that were responsible for getting it into production. Harry Webster (left) brought the design back to Coventry and worked hard on productionising it, while Spen King (right) ensured that the engine used in the Stag was in three-litre form, as he felt the car needed more power

Another view of the Michelotti prototype - and the two men that were responsible for getting it into production. Harry Webster (left) brought the design back to Coventry and worked hard on productionising it, while Spen King (right) ensured that the engine used in the Stag was in three-litre form, as he felt the car needed more power

Shored up by the success of the 2000, Webster eventually convinced upper management that project Stag would be the ideal vehicle on which to base an aggressive expansion of exports to the USA. He later recalled: “Triumph realised back then that we couldn’t compete with the big boys – and we had to find a niche or market gap to fill, and that was where the Stag came in. It was aimed at the young executive, someone who’d gone through the motor bike/sports car/family and family saloon, and wanted something different, something sporty, but with creature comforts.”

Originally, the Stag was designed to use the two-litre straight-six engine in TS tune, but this plan was soon succeeded by one which involved the use of the 2.5-litre version of the straight-six. Several prototypes were built using this layout, but the company’s future engine plans were still somewhat in flux, and so, the Stag’s engine situation changed pretty regularly.

Back in 1963, Lewis Dawtry, a distinguished member of the Triumph engineering team, drew up a report that laid out how he viewed the direction that Triumph’s engine range should go. In it, he stated that the engine family should consist of only two engines: one, a slant-four of 1500cc, which should provide the potential of enlargement to 2-litres – and the other, a small V8 that, essentially, was created by joining two of these engines together, sharing a common crankshaft.

It was around this programme that the Stag needed to fit. So, the initial development of the car was centred around the straight-six, to be used in the 2500, with future variations to be based on the upcoming V8.

Webster was also adamant that in order to succeed in the USA, the straight-six engine would need to be replaced by a V8 – the engine configuration of choice on the other side of the Atlantic. So, he used this as a bargaining tool to convince management to throw their weight behind the V8 programme. As it was, by 1966 Triumph’s V8 engine was already in its early stages of development, and it seemed the logical choice for the new car at the time. But in order to get the car onto the market within reasonable timescales, Triumph decided to introduce the car in 2.5-litre straight-six form, allowing for a careful development programme of the 2.5-litre V8, which could be phased in later.

March 1967
T-Bar roll-over protection added to the Stag

There were problems with the Stag development programme, but nothing significant enough to dissuade the company from forging ahead with it. Structural rigidity – or rather a lack of it – was causing concern for the Canley team, despite the later addition of double-skinned body panels. This led to the adoption of arguably the Stag’s most famous feature: the T-bar roll-over hoop. Harry Webster later recalled: “After ‘Micho’ finshed the prototype, we made some hand-built prototypes ourselves – and suffered from enormous scuttle-shake! Oh boy, it was horrid! You almost had to try and catch the steering wheel, if you know what I mean! The torsional stiffness of the body had gone to hell, of course, and the only way to get it back in was to join up the A and B-posts with a good torsional box across the top, and that’s exactly what the T-Bar does. It helped with the roll-over conditions, but it’s very much part of the structure!”

During the early months of 1967 and while the development of the Stag was in full flow, Triumph was joined by arch-rival Rover in the Leyland Motor Corporation. The reasoning behind this outwardly illogical purchase has been explained in the Whole story, but the net result was the two companies were now part of the same group – and competing models such as the Rover P6 and Triumph 2000 were now bedfellows. The ramifications of the takeover soon made themselves felt – and one main asset Rover brought to Leyland was its magnificent aluminium ex-Buick V8 engine.

By this time, however, development of Triumph’s own V8 was sufficiently advanced that Triumph felt it should continue to use it in the Stag – no matter how appealing this rationalisation may have seemed.

Following the formation of British Leyland in 1968, Harry Webster moved to Austin-Morris and in his place, came Spen King. King had been working intensively on the Rover P8 when he changed camps – and one of the immediate questions coming to Triumph, was that concerning the Stag’s engine. Because of King’s intervention – his feeling was that the 2.5-litre straight-six did not have enough power, and the new V8 under development should be the car’s sole power unit.

Triumph Stag

Even with the hood up, the Stag was a most handsome car. It summed up all that was good and bad about BLMC: wonderful styling, brilliant concept – one fundamental flaw.

Triumph Stag V8

Triumph’s new V8 was compact, efficient and reasonably powerful. The decision to use this engine in the Stag instead of Rover’s off the shelf V8 was an easy one for Triumph to make – development had been a lengthy and costly affair – and the last thing that the company wanted was to scrap it.

January 1968
Why was the Rover V8 not used?

The V8 had already been evolved from a 2.5- to three-litre unit by this time, and where it once used fuel injection, reliability issues forced the use of a carburettor set-up instead. Certainly it was a compact and light unit, but it was not without its fair share of problems. Without doubt, there was still a great deal of in-house rivalry between Rover and Triumph, and it is understandable that Triumph engineers would have been less than keen to use (what they perceived as) its rival’s engine in the forthcoming flagship.

King, however, was more pragmatic – and did raise questions.

King recalled: “I was told that they tried to put it in and you could not put it in and I believed them. I probably shouldn’t have believed it.” However, the decision was not just based upon the pride of Triumph, but also one of production capacity. He continued: “…there were big investments, which had been recently made in both companies for making V8 engines. There wasn’t the capacity for stuffing them in Stags as well. If you are organized to make something, you have got to have a go at the balance between capacity for making things and what they plan (probably dead wrongly because that’s what they normally get wrong more than anything else) is planned amount of sales of any given future motor car. As planned, as I remember it, there wouldn’t have been the spare capacity for V8 engines from the Rover Company to put into Stags. That was an extra thing that people forget about.”

British Leyland would pay a terrible price – because the car’s image suffered massively – for this decision.

As it was, King’s decision to delay the introduction of the Stag until the V8 was ready only added to Triumph’s problems – the car’s weight went up slightly, and because there was no longer a need to use the straight-six, extensive modifications were made to the engine bay. In the end, the Stag shared precious few internal components with the car it was originally closely based upon.

June 1970
Triumph Stag launched

Wider corporate issues also beset the Stag’s development programme, and because of this, British Leyland would not stomach its launch being delayed any longer. Although many commentators have subsequently spoken of the ease in which a Rover V8 would fit into the engine bay, to do so as late as 1968 would have undoubtedly meant the launch date of the Stag would have slipped even further back.

As it was, Rover and Triumph’s model programmes were already being put under minute scrutiny – and that sense of rivalry was being fuelled by the fact that both Solihull and Canley knew there would need to be future rationalisation. And that would inevitably be to the cost of one or the other.

Triumph Stag

The Stag opened up new markets for British Leyland – the company was well served with both Triumph and MG sports cars, but the Stag was something else again: a grand tourer. Essentially, the Stag created a market niche and although it was phased out in 1977 after a production run of nearly 26,000, it is still viewed as the quintessential British “classic” sports car.

The Stag was launched in June 1970 and immediately created a favourable impression with buyers, who were quite literally enamoured by its simple beauty and its gorgeous engine note with accompanying exhaust ‘woofle’. Performance was good – its 2997cc engine certainly did everything asked of it and the 145bhp maximum power output compared favourably with the 143bhp from the 3528cc Rover unit. Sales started briskly and the effect on the Triumph range as a whole was marked – the uplift in image was there for all to see…

The honeymoon period didn’t last long though, and buyers soon found themselves falling out of love with the appealing new car.

Despite its grand ambitions for the Stag, Triumph was finding it difficult to get the quality right on – and the situation wasn’t helped by the dispersed nature of its production (bodies produced at Speke in Liverpool, and final assembly in Canley). Tales of build issues and reliability niggles soon started doing the rounds, and as quickly as BL put one thing right, it seemed another problem would emerge. However, if minor fit and finish problems irritated owners, they were nothing compared with the tales of woe that would emerge about the brand new engine.

Although Spen King told us there were few engine problems in development, this certainly proved not to be the case when it came to production versions. According to Stag specialists today, inherent problems were aplenty. The excessively long single-link timing chains suffered from poor tensioning – and to avoid expensive failures, they needed replacing every 25,000 miles – which would certainly seem to be a design fault. Manufacturing issues such as inadequately sized main bearings, cylinder head warpage due to poor castings, and water pump failures related to drive gear shearing could not be blamed on design weaknesses.

Whoever was to blame for these faults, the end result was a shattered reputation, and declining sales from the point stories of Stag engine failures became widespread…

When the Stag hit the market, there literally was no opposition for it. In contemporary advertising, Triumph highlighted the glamorous nature of the Stag, comparing it positively to Mercedes-Benz and Alfa Romeo’s products… Certainly the advertising department were correct to do so, as it was a very satisfying GT car to drive…

Given the laid-back and pleasantly long-legged nature of the Stag, it comes as no surprise that most owners opted for the Borg-Warner three-speed automatic transmission. Its smooth-shifting nature really suited the car – and did a far better job of cog-swapping than the manual ‘box, which was a derivative of the ancient Triumph TR2 gearbox. Thankfully, the Stag was offered with the option of overdrive, and that made for relaxed high speed cruising.

May 1973
Stag upgraded to Mk2 form

Once it became clear that BL was in a financial pickle, the Stag’s production development became a low-priority issue – and it is for this reason that it didn’t really change much during its seven-year production run. Two models were produced, the MkI (1970–3) and MkII (1973–7), but there are very few differences between the cars.

In the end, a mere 25,877 Stags were produced between 1970 and 1977. The Stag died simply because there was no money in BL’s kitty to put it right – and a car which used a unique engine, and which accounted for so few sales was a luxury a company fighting for survival could not afford. When it quietly slipped into obscurity, the Stag was mourned by few – but within the space of a few short years, it picked up a cult following, and remains today the doyen of classic British cars – and lines up alongside the MGB and Morris Minor as the most iconic classics of the time.

May 1977
Stag production ended

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