|1967 to 1969|
|Manufacturer||Triumph Motor Company|
|Body and chassis|
|Engine||2498 cc Straight-6|
|Transmission||4-speed Manual, optional overdrive|
|Wheelbase||2.240 m (7 ft 4.19 in)|
|Length||3.902 m (12.80 ft)|
|Width||1.470 m (4 ft 9.87 in)|
|Height||1.170 m (3 ft 10.06 in)|
|Curb weight||1,030 kg (2,270.8 lb)|
The Triumph TR5 was built for a 13-month period between August 1967 and September 1968 by the Triumph Motor Company in Coventry, England.
Visually identical to the Michelotti styled TR4, the TR5 hid the main differences under the body. The most significant change from the TR4 was the 2.5-litre straight-6 fuel-injected engine, developing around 150 bhp (112 kW)(145 hp DIN), and which was carried forward to the TR6.
At the time, fuel injection (or PI petrol injection, as it was sometimes then called) was uncommon in road cars. Triumph claimed in their sales brochure that it was the "First British production sports car with petrol injection". This engine could propel the TR5 from 0–50 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 reported 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 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 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. In the first quarter of 2011 there were approximately 410 licensed and 74 SORN TR5s registered 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 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 engined 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.
- engine capacity 152.43 cu in, 2,498 cu cm
- fuel consumption 23 ml imp gal, 12.3 ml US gal
- max speed 125 mph, 201.2 km/h
- max power (DIN): 150 hp at 5,500 rpm
- max torque (DIN): 164 1b ft, 22.6 kg m at 3,500 rpm
- max engine rpm: 6,000
- specific power: 60 hp/l
- power-weight ratio: 14.3 lb/hp, 6.5 kg/hp
- acceleration: standing 1/4 mile 16.5 sec, 0—50 mph (0 —80 km/h) 6.5 sec
Triumph TR5 Technical details and specifications (1967-1969)
location front, 4 stroke
cylinders: 6, in line
bore and stroke: 2.94 x 3.74 in, 74.7 x 95 mm
engine capacity: 152.43 cu in, 2,498 cu cm
compression ratio: 9.5
cylinder block: cast iron
cylinder head: cast iron
crankshaft bearings: 4
valves: 2 per cylinder, overhead, in line, push-rods and rockers
camshafts: 1, side
lubrication: eccentric pump, full flow filter
carburation: Lucas injection pump (constant pressure), injectors in inlet pipes
fuel feed : electric pump
cooling system: water
driving wheels: rear
clutch: single dry plate (diaphragm), hydraulically controlled
gearbox: mechanical; gears: 4+ reverse
synchromesh gears: l, II, III, IV
gearbox ratios: I 3.140, II 2.010, III 1.330, IV 1, rev 3.220
(option)Laycock-de Normanville overdrive on 2nd, 3rd and 4th (0.820 ratio)
gear lever location: central
final drive: hypoid bevel
axle ratio: 3.450.
type box-type ladder frame, X cross members
front suspension: independent, wishbones, coil springs, telescopic dampers
rear suspension: independent, semi-trailing arms, coil springs, telescopic dampers.
turns of steering wheel lock to lock: 3.25.
turning circle (between walls): 33 ft, 10.1 m
front disc (diameter 10.85 in, 276 mm), rear drum
area rubbed by linings: front 233 sq in, 1,502.85 sq cm
area rubbed by linings: rear 99 sq in, 638.55 sq cm
area rubbed by linings: total 332 sq in, 2,141.40 sq cm.
voltage: 12 V
battery: 57 Ah
generator type: alternator
ignition distributor: Lucas
DIMENSIONS AND WEIGHT
wheel base: 88 in, 2,235 mm
front track: 49.25 in, 1,251 mm
rear track: 48.75 in, 1,238 mm
overall length: 153.60 in, 3,901 mm
overall width: 58 in, 1,473 mm
overall height: 50 in, 1,270 mm
ground clearance: 6 in, 152 mm
dry weight: 2,156 1b, 978 kg
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
© Motor car History
Triumph TR5 Maintenance and Service Guide (1967-1969)
fuel: 100 oct petrol
engine oil change: 8 imp pt, 9.51 US pt, 4.5 1, SAE 20W-30, change every 6,000 miles, 9,700 km
lubricating system capacity: 9 imp pt, 10.78 US pt
cooling system capacity: 12.30 imp pt, 14.80 US
gearbox oil: 2 imp pt, 2.32 US pt, 1.1 1, SAE 90, no change recommended
final drive oil: 1.50 imp pt, 1.69 US pt, 0.8 1, SAE 90, no change recommended
tappet clearances: inlet 0.010 in, 0.25 mm, exhaust 0.010 in, 0.25 mm
normal tyre pressure: front 22 psi, 1.5 atm, rear 24 psi, 1.7 atm.
width of rims: 4.5"
tyres: 165 x 15
fuel tank capacity: 11 imp gal, 13.2 US gal
carrying capacity: 353 1b, 160 kg
© Motor car History
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