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Triumph TR5

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Triumph TR5
Triumph TR250
Overview
ManufacturerTriumph Motor Company
Production1967–1968
AssemblyCoventry, England
DesignerGiovanni Michelotti
Body and chassis
ClassSports car
Body styleRoadster
LayoutFront-engine, rear-wheel-drive
Powertrain
Engine2.5-litre straight-6
Transmission4-speed manual, optional overdrive
Dimensions
Wheelbase2,240 mm (88 in)
Length3,902 mm (154 in)
Width1,470 mm (58 in)
Height1,170 mm (46 in)
Kerb weight1,030 kg (2,271 lb)
Chronology
PredecessorTriumph TR4A
SuccessorTriumph TR6

The Triumph TR5 is a sports car built by the Triumph Motor Company in Coventry, England, between August 1967 and September 1968.[1]

Visually similar to the TR4 (also styled by Michelotti),[2] the TR5 roadster sported Triumph's much more powerful 2.5-litre straight-6, fitted with Lucas mechanical fuel-injection and producing 150 bhp (110 kW). Price pressures and tighter emissions standards in the U.S. resulted in a much less powerful carburetted version, the TR250, being sold on the North American market.

At the time, fuel injection was uncommon in road cars. Triumph claimed in their sales brochure that it was the "First British production sports car with petrol injection".[3][4]

TR5

Standard equipment included front disc brakes, independent rear suspension, rack and pinion steering and a four speed gearbox. Optional extras included overdrive and wire wheels. 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.[4]

The TR5 was available with the "Surrey Top" hard top, a weather protection system with rigid rear section including the rear window and removable fabric section over the driver and passenger's heads.

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 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. The similarly engineered contemporary saloon overcame this problem with a petrol tank specially designed for the fuel injected model. This incorporated an anti-slosh cup to ensure that the fuel outlet remained covered with fuel when the tank level was low.

Specifications

Taken from the UK sales brochure.[3]

  • Engine: 2498 cc, 6 cylinder, 74.7 mm bore, 95 mm stroke, 9.5:1 compression ratio, 150 bhp (110 kW)
  • Turning circle: 10.1 m (33.1 ft)
  • Ground clearance: 152 mm (6.0 in)
  • Luggage capacity:
    • Max width: 1,180 mm (46.5 in)
    • Max height: 510 mm (20.1 in)
  • Capacities:
Fuel tank: 51 litres (11.22 imp gal; 13.47 US gal)
Engine sump: 4.53 litres (1.00 imp gal; 1.20 US gal)
Gearbox: 1.13 litres (0.25 imp gal; 0.30 US gal)
  • Acceleration in top:
30 to 50 mph: 7 s
40 to 60 mph: 7 s
60 to 80 mph: 8 s
  • Standing 0.25 miles (0.40 km) : 16.5 s
  • Gear ratios:
  Top 3rd 2nd 1st Rev.
Ratios 1.0 1.33 2.01 3.14 3.22
Overall 3.45 4.59 6.94 10.83 11.11
  • Available colours:[1]
Paint Trim
New White Black / Matador Red
Triumph Racing Green Black, Light Tan
Signal Red Black
Jasmine Yellow Black / Light Tan
Royal Blue Black / Shadow Blue
Valencia Blue Black / Light Tan

Performance

The fuel-injected engine could propel the TR5 from 0–50 mph (80 km/h) in 6.5 seconds, reaching a top speed of 125 mph (201 km/h).[3] Road tests at the time reported slightly different performance figures:[5]

  Sports Car World
October 1968 		Cars & Car Conversions
September 1968 		Motor
4 May 1968
0-50 mph (80 km/h) 6.2 s 6.4 s 6.3 s
Top Speed 118 mph (190 km/h) 112 mph (180 km/h) 117 mph (188 km/h)

The TR5 engine was carried forward to the TR6.

Production

The TR5 was produced in small numbers when compared with the later TR6, with just 2,947 units produced; the first car was assembled on 29 August 1967 and the last on 19 September 1968. Of these, 1,161 were destined for the UK market,[6] the remainder were left hand drive and were exported to France, Belgium and Germany amongst other countries. In the first quarter of 2011 there were approximately 410 licensed and 74 SORN TR5s registered with the DVLA.[7][8]

TR250

The Triumph TR250 was built during the same period for the North American market. Price pressures and tighter emission regulations resulted in twin Zenith-Stromberg carburettors being fitted instead of the TR5's Lucas fuel injection system. Otherwise it is nearly identical.

The TR250's engine delivered 111 bhp (81 kW), 39 bhp less than the TR5; 0–60 mph (0–97 km/h) acceleration took 10.6 seconds.[2][9] The TR250 was also available with the Surrey Top system.

In 1968, the TR250 sold in North America for approximately $3,395, with wire wheels a $118 option, overdrive $175, and air conditioning $395.[10]

Specifications

Engine:

  • 2,498 cc, inline-six cylinder, 74.7 mm (2.9 in) bore, 95 mm (3.7 in) stroke, 8.5:1 compression ratio, 111 bhp (83 kW; 113 PS) at 4,500 rpm

Turning circle: 10.1 m (33 ft)

Capacities:

Fuel tank: 51 litres (11.22 imp gal; 13.47 US gal)
Engine sump: 5.4 L (9.64 imp pt)
Gearbox: 1.13 L (2 imp pt)

Performance:

0 to 60 mph (97 km/h): 10.6 seconds[11]
0 to 100 mph (160 km/h): 39 seconds
Fuel consumption: 23.5 miles per US gallon (10.0 L/100 km; 28.2 mpg‑imp) [11]

Production

A total of 8,484 TR250s were built for the U.S market.[1][12] Approximately 600 remain worldwide today, and many can now be found outside the United States, primarily in Europe.

Wikimedia Commons has media related to Triumph TR5.
  • Triumph TR5
  • 1968 TR5 front quarter view
    1968 TR5 front quarter view
  • 1968 TR5 interior
    1968 TR5 interior
  • 1968 TR5 engine bay
    1968 TR5 engine bay
  • 1968 TR5 rear quarter view
    1968 TR5 rear quarter view
  • TR5 with hardtop fitted
    TR5 with hardtop fitted
  • TR250
    TR250
  • TR250 Surrey Top
    TR250 Surrey Top

References

  1. ^ a b c Piggott, Bill. Original Triumph TR. ISBN 1-870979-24-9.
  2. ^ a b TR for Triumph, Chris Harvey, ISBN 0-902280-94-5
  3. ^ a b c Original UK sales brochure, 387/168/UK
  4. ^ a b "Motor Magazine". Vol. 133, no. 3437. 4 May 1968. {{cite magazine}}: Cite magazine requires |magazine= (help)
  5. ^ Clarke, R. M. Triumph TR4, TR5, TR250. ISBN 0-948207-53-1.
  6. ^ Richards, Michael. Triumph TR4, 5, 6. ISBN 0-85429-816-9.
  7. ^ "Triumph Tr5". How Many Left. Retrieved 27 June 2011.
  8. ^ "Vehicle licensing statistics". Department of Transport. Archived from the original on 29 August 2011. Retrieved 27 June 2011.
  9. ^ "Road & Track". December 1967. {{cite magazine}}: Cite magazine requires |magazine= (help)
  10. ^ Motor Trend Magazine, April 1968
  11. ^ a b Bryant, Thomas L. (June 1977), "Driving Impressions: TR3A & TR250", Road & Track
  12. ^ Original Triumph TR, Bill Piggott, ISBN 1-870979-24-9
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