Specification

   
  • Parent company Leyland Motors Ltd
  • Manufacturer Triumph Motor Company
  • Production 1967–1968
  • Designer(s) Giovanni Michelotti
  • Assembly Coventry, United Kingdom
  • Body style(s) Convertible
  • Class Sports car
  • Successor Triumph TR6
  • Engine(s) 2498 cc Straight-6
  • Fuel Capacity 51L (11.2 imp gal; 13.5 US gal)
  • Transmission(s) 4-speed Manual, optional overdrive
  • Height 1.170 m (3.84 ft)
  • Length 3.902 m (12.80 ft)
  • Width 1.470 m (4.82 ft)
  • Wheelbase 2.240 m (7.35 ft)
  • Kerb Weight 1,030 kg (2,270.8 lb)
  • Layout FR layout
  • Predecessor Triumph TR4A
  • Related Triumph TR250

The history of the Triumph TR5

   

The Triumph TR5 was built for a 13 month period between August 1967 and September 1968 by the Triumph Motor Company in Coventry, United Kingdom. 
Visually identical to the Michelotti styled TR4, the TR5 hid the main differences under the body, and the most significant of these was the engine. The TR5 boasted a 2.5 litre straight 6 fuel injected engine developing around 150 bhp (112 kW). This engine was carried forward to the TR6. 
At the time, fuel injection (or PI petrol injection, as it was sometimes called back then) was uncommon in road cars. So much so that Triumph claimed in their sales brochure that it was the "First British production sports car with petrol injection - PI". This engine could propel the TR5 from 0 to 50 mph (80 km/h) in just 6.5 seconds, and on to a top speed of 125 mph (201 km/h). Road tests at the time got slightly different performance figures. 
Standard equipment included front disc brakes, independent rear suspension, rack and pinion steering and a four speed gearbox. The available optional extras included overdrive, wire wheels and a hard top with detachable roof panel - known as the 'Surrey Top'. 
In 1968, the basic price of the TR5 in the UK was £1,260 including taxes, with wire wheels being another £38, overdrive £60 and a tonneau cover another £13. 
The TR5 was produced in small numbers when compared with the later TR6, with just 2,947 units produced - the first car being assembled on 29 August 1967 and the last on 19 September 1968. Of these, 1,161 were destined for the UK market, the remainder being LHD TR5s and going to France, Belgium and Germany amongst others. In a similar period 8,484 TR250s were built for the U.S market. At the end of 2007, there were approximately 500 TR5s registered in the UK with the DVLA. 
The TR250, built during the same period for the North American market, was nearly identical to the TR5. But, because of price pressures and emission regulations the TR250 was fitted with twin Zenith-Stromberg carburettors rather than the Lucas fuel injection system, and took 10.6 seconds to get to 60 mph (97 km/h). 
A curious feature of the TR5/Lucas petrol injection system was the very frequent occurrence of an intermittent power failure when the fuel tank was no more than a quarter full. In order to provide fresh fuel at the distributor, free from overheating/soak, unused fuel was returned back to the tank where it entered very close to the high pressure fuel pump. When the fuel level fell below critical (about 3 gallons), sloshing would cause the pump to pick up a slightly aerated mixture which was sent to the fuel distributor. Unused fuel (still aerated) then passed back to the tank and was discharged close to the pump, a proportion of it being picked up and recycled to the distributor. As this cycle was repeated, gradually the volume of air in the pumped fuel reached a level where it began to affect the running of the engine. Adding as little as one gallon to the tank seemed to cure the problem which did not manifest itself on the similarly engined contemporary saloon. 
Visually identical to the Michelotti styled TR4, the TR5 hid the main differences under the body, and the most significant of these was the engine. The TR5 boasted a 2.5 litre straight 6 fuel injected engine developing around 150 bhp (112 kW). This engine was carried forward to the TR6. 

Triumph for sale

   
Triumph TR6
1974 Shropshire
GBP2,850
Private sale Views: 18517
Triumph TR4A
1967 Pennsylvania
US$24,000
Trade sale Views: 1147
Triumph TR6
Surrey
POA
Trade sale Views: 7940
Triumph TR6
1971 Hovedstaden
EURO18,000
Private sale Views: 1850
Triumph TR6
1973 Bristol
GBP35,000
Trade sale Views: 8936
Triumph TR6
1969 Oxfordshire
GBP17,950
Private sale Views: 2447