Engineering:Triumph TR5

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Triumph TR5
Triumph TR250
Triumph TR5 PI Front.jpg
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 (88.2 in)
Length3,902 mm (153.6 in)
Width1,470 mm (57.9 in)
Height1,170 mm (46.1 in)
uk|uk|Kerb|Curb}} 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 Michelotti-designed TR4 roadster it was derived from,[2] the TR5 replaced Triumph's 105 bhp (78 kW) SAE Standard inline-four engine with the much more powerful Lucas mechanical fuel-injected 150 bhp (110 kW) Triumph 2.5-litre straight-6. 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

The base price of a 1968 TR5 in the UK was £1,260 including taxes. Standard equipment included front disc brakes, independent rear suspension, rack and pinion steering and a four speed gearbox. Optional extras included wire wheels (£38), overdrive (£60), and a tonneau cover (£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.

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
Wedgewood Blue Black / Shadow Blue
Valencia Blue Black / Light Tan

Performance

According to its UK sales brochure, 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 either the TR250 or 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 the USA for approximately US$3,395, with wire wheels an $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, many destined for the US and Canada.[1][12] More than 1300 TR250s are still viable in the world today. Many can now be found outside the United States, primarily in Europe.

Gallery

  • Triumph TR5

  • 1968 TR5 front quarter view

  • 1968 TR5 interior

  • 1968 TR5 engine bay

  • 1968 TR5 rear quarter view

  • TR5 with hardtop fitted

  • TR250

  • TR250 Surrey Top

References

  1. ↑ 1.0 1.1 1.2 Piggott, Bill (1991). Original Triumph TR. ISBN 1-870979-24-9. 
  2. ↑ 2.0 2.1 TR for Triumph, Chris Harvey, ISBN:0-902280-94-5
  3. ↑ 3.0 3.1 3.2 Original UK sales brochure, 387/168/UK
  4. ↑ 4.0 4.1 Motor Magazine. 133. 4 May 1968. 
  5. ↑ Clarke, R. M. (December 1985). Triumph TR4, TR5, TR250. ISBN 0-948207-53-1. 
  6. ↑ Richards, Michael (1990). Triumph TR4, 5, 6. ISBN 0-85429-816-9. https://archive.org/details/triumphtr4560000rich. 
  7. ↑ "Triumph Tr5". http://www.howmanyleft.co.uk/vehicle/triumph_tr5. Retrieved 27 June 2011. 
  8. ↑ "Vehicle licensing statistics". Department of Transport. Archived from the original on 29 August 2011. https://web.archive.org/web/20110829152645/http://www2.dft.gov.uk/pgr/statistics/datatablespublications/vehicles/licensing/. 
  9. ↑ Road & Track. December 1967. 
  10. ↑ Motor Trend Magazine, April 1968
  11. ↑ 11.0 11.1 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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