Triumph TR5
The Triumph TR5 is a sports car built by the Triumph Motor Company in Coventry, England, between August 1967 and September 1968.
Visually similar to the TR4, the TR5 roadster sported Triumph's much more powerful 2.5-litre straight-6, fitted with Lucas mechanical fuel-injection and producing. 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".
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.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, sloshing would cause the pump to pick up a slightly aerated mixture which was sent to the fuel distributor. Unused fuel 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.- Engine: 2498 cc, 6 cylinder, 74.7 mm bore, 95 mm stroke, 9.5:1 compression ratio,
- Turning circle:
- Ground clearance:
- Luggage capacity:
- * Max width:
- * Max height:
- Capacities:
- Acceleration in top:
- Standing : 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:
| 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– in 6.5 seconds, reaching a top speed of. Road tests at the time reported slightly different performance figures:| Sports Car World October 1968 | Cars & Car Conversions September 1968 | Motor 4 May 1968 | |
| 0- | 6.2 s | 6.4 s | 6.3 s |
| Top Speed |
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, 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.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, 39 bhp less than the TR5; acceleration took 10.6 seconds. 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.
Specifications
Engine:- 2,498 cc, inline-six cylinder, bore, stroke, 8.5:1 compression ratio, at 4,500 rpm
Capacities:
Performance: