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Triumph TR-4

(1961 model)

Brief specs of 1961 Triumph TR-4

2-door 2-seater drophead coupé (convertible coupé), petrol (gasoline) 4-cylinder 8-valve straight (inline) engine, OHV (overhead valve, I-head), 2138 cm3 / 130.5 cu in / 130.5 cu in, 74.6 kW / 100.0 hp / 100.0 hp @ 4600 rpm / 4600 rpm / 4600 rpm, 172.0 N·m / 126.9 lb·ft / 126.9 lb·ft @ 3350 rpm / 3350 rpm / 3350 rpm, manual 4-speed transmission, rear wheel drive, 165 km/h / 103 mph / 103 mph top speed

units: metric UK US

Basic (general) data

Marque (make)TriumphIssued from1961
ModelTR-4Issued until
SerieTRNumber made
Model familyBody construction
Model codeBody designation
ManufacturerTriumphCountryUK

Bodywork

Base platformNumber of doors2
Bodywork typedrophead coupé (convertible coupé)Number of seats2
Bodywork designerCargo capacity (volume)
Passenger space (volume)3350 l / 118.30 cu ft / 118.30 cu ftMax. cargo capacity (volume)

Dimensions & Weight

Length3962 mm / 156.0 in / 156.0 inTotal (curb) weight966 kg / 2130 lb / 2130 lb
Width1461 mm / 57.5 in / 57.5 inDry weight
Height1270 mm / 50.0 in / 50.0 inLoad capacity
Wheelbase2238 mm / 88.1 in / 88.1 inGross (max.) weight
Track front1245 mm / 49.0 in / 49.0 inTowing weight
Track rear1219 mm / 48.0 in / 48.0 inWeight distribution (front)
Ground clearance152 mm / 6.0 in / 6.0 inFuel capacity53 l / 11.7 UK gal / 14.1 US gal
Length/wheelbase ratio1.77  

Aerodynamics

Drag coefficient (Cd, Cx, Cw)0.5Frontal area (A)1.58 m2 / 17.0 sq ft / 17.0 sq ft (est.)
Aerodynamic coefficient (Cd×A)0.79 m2 / 8.5 sq ft / 8.5 sq ft (est.)Aerodynamic resistance (Aero horse power) at 100 km/h (62 mph)19.6 kW / 26.3 hp / 26.3 hp (est.)

Engine

Engine CodeTotal number of cylinders4
Engine Typestraight (inline) (Inline, 4 cylinder)Total number of valves8
Engine ManufacturerTriumphValves per cylinder2
Engine constructionBore86.0 mm / 3.39 in / 3.39 in
Fuelpetrol (gasoline)Stroke92.0 mm / 3.62 in / 3.62 in
Fuel detailsBore/Stroke ratio0.93
Fuel supply2 SU carbsEngine displacement2138 cm3 / 130.5 cu in / 130.5 cu in
Engine Main bearings5Unitary capacity534.50 cm3/cylinder / 32.617 cu in/cylinder / 32.617 cu in/cylinder
Cam DesignOHV (overhead valve, I-head)Compression ratio9.0 : 1
SumpMax. output power74.6 kW / 100.0 hp / 100.0 hp at 4600 rpm / 4600 rpm / 4600 rpm
AspirationnaturalMax. torque172.0 N·m / 126.9 lb·ft / 126.9 lb·ft at 3350 rpm / 3350 rpm / 3350 rpm
Compressor typeN/AMaximum rpm
IntercoolernoMax. net output (power at the wheels)38.9 kW / 52.2 hp / 52.2 hp (est.)
CoolantwaterSpecific output34.9 kW/l / 0.767 bhp/cu in / 0.767 bhp/cu in
Catalytic converternoSpecific torque80.5 N·m/l / 0.70 lb·ft/cu in / 0.70 lb·ft/cu in

Transmission

Transmission typemanualNumber of gears4
Wheel driverear wheel driveTop gear (drive) ratio1
  Final gear (drive) ratio3.7

Performance

Acceleration 0-50 mph (80 km/h)8.30 s / 8.30 s / 8.30 sTop (maximal) speed165 km/h / 103 mph / 103 mph
Acceleration 0-60 mph (97 km/h)10.90 s / 10.90 s / 10.90 sPower-to-weight ratio103.5 kW/ton / 78.4 bhp/ton / 78.4 bhp/ton
Acceleration 0-100 km/hFuel consumption, City (urban)
Acceleration 0-100 mph (160 km/h)Fuel consumption, Road (extra-urban)
Acceleration 80-120 km/h (50-70 mph) in topFuel consumption, Mixed (combined)
Standing ¼mile time Fuel consumption, Euro
Standing kilometer time CO2 emissions
  Range

Chassis

Engine locationfrontEngine alignmentlongitudinal
SteeringSteering details
Turns lock-to-lock2.5Turning circle10.4 m / 34.1 ft / 34.1 ft
Suspension frontIndependent, Coil springsSuspension rearLive axle, Semi-elliptic leaf springs
Wheels frontWheels rear
Tyres front5.50-15Tyres rear5.50-15
Brakes frontdiscBrakes reardrum
Brake diameter frontBrake diameter rear
Brakes detailsBraked area

Technical specifications and performance data of Triumph TR-4

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