1974 Triumph TR6 Technical Specification and History

Triumph TR6 for hire in Warwickshire from The Open Road - Classic Car Hire
Triumph TR6 for hire in Warwickshire from The Open Road - Classic Car Hire
Built from 1968 to 1976 the TR6 was the last incarnation of the separate chassis TRs.  The body was re-designed by Karmann of Germany, although the centre section and doors were the same as the TR4 and TR5 (and are physically inter-changeable). 

 

The old four cylinder engine from the TR4 was replaced by the Triumph six cylinder 2,500 litre engine fitted with Lucas mechanical petrol injection.  The TR5 and TR6 were the first UK production sports cars with petrol Injection. 

 

Production:

 

January 1968 to 1976     – 91,850  

Price when new in 1969 - £1,333

 

From 1967 to 1972 the cars developed 150 bhp, but this was problematical and lumpy in town traffic, and from 1972 was de-tuned to 125 bhp. The petrol Injection did not meet the US emission control regulations, so US cars had the 2,500 litre engine but equipped with twin Stromberg carburettors and only produced about 104 bhp.  

 

The interior remained similar to the TR4 and TR5 with a wooden dash and good quality trim.  The manual gearbox has synchromesh on all four gears and is fitted with overdrive that works on 3rd and 4th gears. 

 

 

Construction:

 

Steel chassis with steel body bolted on separately.  All four wings bolt on to the inner wings.

 

History of PVF 255M:  

 

This car has been the subject of a complete body off restoration from 1988 through the early 1990s.  The chassis was stripped down and re-painted, the suspension rebuilt, all four wings replaced and the body repainted in its original colour of Mimosa Yellow.  The engine was rebuilt and the unreliable Lucas fuel pump replaced with a modern Bosch one.  The car won the award for Best TR at the 1993 Classic Sportscar Show and had covered less than 5,000 miles between then and 2001.  Prior to us buying it, the metering unit was changed so that the car could spend the rest of its life on unleaded petrol.

 

When we purchased our Triumph TR6 from TR Bitz in Warrington, they installed a new fuel metering unit fitted with unleaded seals, and we have run it on unleaded petrol ever since.  Since then it has been driven all over the country by our customers, including a Canadian couple who took it on the Three Castles Tour of North Wales.  We have driven it on the MSA Euroclassic six times.  We have the abiding memory of having climbed all 49 hairpin bends of the Stelvio pass on September 11th 2001 to hear that a plane had flown into one of the World Trade Centre buildings.  Then at the top of the Gavia pass we heard that another plane had flown into the second tower. The run finished at the circuit at Imola.   

 

In September the 2003 MSA Euroclassic took us south through France and across the Pyrenees to Valencia in Spain and then in September 2004 the TR6 took us on the Euroclassic from Paris to Florence, via Monaco, without missing a beat.  We have since completed a further two Euroclassic runs in our TR6.

 

On 7 November 2004 the TR6 speedo finally went round the clock, having completed 100,000 miles. Here's to its next 100,000!  Most classic cars run better for being used and we think this counts as 'using' our TR6 properly. So why not follow our own lead and treat yourself to the ultimate Triumph TR6 driving experience.

 

Technical: 

  

  • Engine 2,498 cc straight six cylinder engine with overhead valves operated by a single camshaft and pushrods.
  • Develops 125 bhp at 5,000 rpm and 132 lb ft of torque at 3,000 rpm  
  • Mechanical fuel injection, originally using Lucas equipment although the fuel pump has been replaced by a more reliable, high pressure Bosch one.   
  • Contact breaker points gap (where fitted) 0.014 to 0.016 in  (0.36 to 0.41mm) 
  • Spark plug gaps 0.025 in (0.64mm) 
  • Fitted with six branch sports exhaust manifold  
  • Manual 4 speed gearbox with synchromesh on all gears and overdrive on 3rd and 4th.   
  • Servo assisted brakes with uprated, grooved and vented, discs on the front & aluminium finned drums on rear.  
  • Front suspension: double wishbones, coil springs, telescopic shock absorbers with anti-roll bar.  
  • Rear suspension: independent with cast aluminium semi-trailing arms, coil springs.    
  • The original lever arm dampers have been replaced with Spax shock absorbers.  
  • Steering: Rack & pinion with 3 1/2 turns lock to lock.   
  • Wheels: bolt on stove enamelled 5½J steel wheels with 165/15 radial tyres.   
  • Tyre pressures (pounds per square inch): Front 24, Rear 28.  
  • 0-60 in 11.4 secs.   
  • Top speed 116mph.


 

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