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Triumph TR-7 5-speed

(1978 model)

Brief specs of 1978 Triumph TR-7 5-speed

2-door 2-seater fixed-head coupé, petrol (gasoline) 4-cylinder 8-valve straight (inline) engine, SOHC (single overhead camshaft), 1998 cm3 / 121.9 cu in / 121.9 cu in, 78.3 kW / 105.0 hp / 105.0 hp @ 5500 rpm / 5500 rpm / 5500 rpm, 161.0 N·m / 118.7 lb·ft / 118.7 lb·ft @ 3500 rpm / 3500 rpm / 3500 rpm, manual 5-speed transmission, rear wheel drive

units: metric UK US

Basic (general) data

Marque (make)TriumphIssued from1978
ModelTR-7 5-speedIssued until
SerieTRNumber made
Model familyBody construction
Model codeBody designation
ManufacturerTriumphCountryUK

Bodywork

Base platformNumber of doors2
Bodywork typefixed-head coupéNumber of seats2
Bodywork designerCargo capacity (volume)
Passenger space (volume)Max. cargo capacity (volume)

Dimensions & Weight

Length4067 mm / 160.1 in / 160.1 inTotal (curb) weight1048 kg / 2310 lb / 2310 lb
Width1681 mm / 66.2 in / 66.2 inDry weight
Height1267 mm / 49.9 in / 49.9 inLoad capacity
Wheelbase2160 mm / 85.0 in / 85.0 inGross (max.) weight
Track front1410 mm / 55.5 in / 55.5 inTowing weight
Track rear1410 mm / 55.5 in / 55.5 inWeight distribution (front)
Ground clearance90 mm / 3.5 in / 3.5 inFuel capacity55 l / 12.1 UK gal / 14.5 US gal
Length/wheelbase ratio1.88  

Aerodynamics

Drag coefficient (Cd, Cx, Cw)Frontal area (A)1.81 m2 / 19.5 sq ft / 19.5 sq ft (est.)
Aerodynamic coefficient (Cd×A)Aerodynamic resistance (Aero horse power) at 100 km/h (62 mph)

Engine

Engine CodeTotal number of cylinders4
Engine Typestraight (inline) Total number of valves8
Engine ManufacturerTriumphValves per cylinder2
Engine constructionBore90.3 mm / 3.56 in / 3.56 in
Fuelpetrol (gasoline)Stroke78.0 mm / 3.07 in / 3.07 in
Fuel detailsBore/Stroke ratio1.16
Fuel supply2 SU carbsEngine displacement1998 cm3 / 121.9 cu in / 121.9 cu in
Engine Main bearings5Unitary capacity499.50 cm3/cylinder / 30.481 cu in/cylinder / 30.481 cu in/cylinder
Cam DesignSOHC (single overhead camshaft)Compression ratio9.2 : 1
SumpMax. output power78.3 kW / 105.0 hp / 105.0 hp at 5500 rpm / 5500 rpm / 5500 rpm
AspirationnaturalMax. torque161.0 N·m / 118.7 lb·ft / 118.7 lb·ft at 3500 rpm / 3500 rpm / 3500 rpm
Compressor typeN/AMaximum rpm
IntercoolernoMax. net output (power at the wheels)31.3 kW / 42.0 hp / 42.0 hp (est.)
CoolantwaterSpecific output39.2 kW/l / 0.861 bhp/cu in / 0.861 bhp/cu in
Catalytic converternoSpecific torque80.6 N·m/l / 0.70 lb·ft/cu in / 0.70 lb·ft/cu in

Transmission

Transmission typemanualNumber of gears5
Wheel driverear wheel driveTop gear (drive) ratio0.83
  Final gear (drive) ratio3.9

Performance

Acceleration 0-50 mph (80 km/h)Top (maximal) speed
Acceleration 0-60 mph (97 km/h)Power-to-weight ratio100.2 kW/ton / 75.9 bhp/ton / 75.9 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
Steeringrack & pinionSteering details
Turns lock-to-lock3.87Turning circle
Suspension frontIndependent, MacPherson strut, Lower wishbone, Anti-roll (anti-sway) bar (ARB)Suspension rearLive axle, Trailing arm, Semi-trailing arm, Coil springs, Anti-roll (anti-sway) bar (ARB)
Wheels frontWheels rear
Tyres frontTyres rear
Brakes frontdiscBrakes reardrum
Brake diameter frontBrake diameter rear
Brakes detailsservo-assistedBraked area

Technical specifications and performance data of Triumph TR-7 5-speed

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