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Lotus Seven S4

(1970 model)

Brief specs of 1970 Lotus Seven S4

2-door 2-seater roadster, petrol (gasoline) 4-cylinder 8-valve straight (inline) engine, OHV (overhead valve, I-head), 1599 cm3 / 97.6 cu in / 97.6 cu in, 64.1 kW / 86.0 hp / 86.0 hp @ 5500 rpm / 5500 rpm / 5500 rpm, 125.0 N·m / 92.2 lb·ft / 92.2 lb·ft @ 4000 rpm / 4000 rpm / 4000 rpm, manual 4-speed transmission, rear wheel drive

units: metric UK US

Basic (general) data

Marque (make)LotusIssued from1970
ModelSeven S4Issued until
SerieSevenNumber made
Model familyBody construction
Model codeBody designation
ManufacturerLotusCountryUK

Bodywork

Base platformNumber of doors2
Bodywork typeroadsterNumber of seats2
Bodywork designerCargo capacity (volume)
Passenger space (volume)3430 l / 121.13 cu ft / 121.13 cu ftMax. cargo capacity (volume)

Dimensions & Weight

Length3702 mm / 145.7 in / 145.7 inTotal (curb) weight590 kg / 1301 lb / 1301 lb
Width1537 mm / 60.5 in / 60.5 inDry weight
Height1124 mm / 44.3 in / 44.3 inLoad capacity
Wheelbase2286 mm / 90.0 in / 90.0 inGross (max.) weight
Track front1245 mm / 49.0 in / 49.0 inTowing weight
Track rear1321 mm / 52.0 in / 52.0 inWeight distribution (front)
Ground clearance114 mm / 4.5 in / 4.5 inFuel capacity34 l / 7.5 UK gal / 9.0 US gal
Length/wheelbase ratio1.62  

Aerodynamics

Drag coefficient (Cd, Cx, Cw)Frontal area (A)1.47 m2 / 15.8 sq ft / 15.8 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) (Inline, 4 cylinder)Total number of valves8
Engine ManufacturerValves per cylinder2
Engine constructionBore81.0 mm / 3.19 in / 3.19 in
Fuelpetrol (gasoline)Stroke77.6 mm / 3.06 in / 3.06 in
Fuel detailsBore/Stroke ratio1.04
Fuel supply1 We carbEngine displacement1599 cm3 / 97.6 cu in / 97.6 cu in
Engine Main bearingsUnitary capacity399.75 cm3/cylinder / 24.394 cu in/cylinder / 24.394 cu in/cylinder
Cam DesignOHV (overhead valve, I-head)Compression ratio9.0 : 1
SumpMax. output power64.1 kW / 86.0 hp / 86.0 hp at 5500 rpm / 5500 rpm / 5500 rpm
AspirationnaturalMax. torque125.0 N·m / 92.2 lb·ft / 92.2 lb·ft at 4000 rpm / 4000 rpm / 4000 rpm
Compressor typeN/AMaximum rpm
IntercoolernoMax. net output (power at the wheels)25.6 kW / 34.4 hp / 34.4 hp (est.)
CoolantwaterSpecific output40.1 kW/l / 0.881 bhp/cu in / 0.881 bhp/cu in
Catalytic converternoSpecific torque78.2 N·m/l / 0.68 lb·ft/cu in / 0.68 lb·ft/cu in

Transmission

Transmission typemanualNumber of gears4
Wheel driverear wheel driveTop gear (drive) ratio1
  Final gear (drive) ratio3.77

Performance

Acceleration 0-50 mph (80 km/h)Top (maximal) speed
Acceleration 0-60 mph (97 km/h)Power-to-weight ratio145.8 kW/ton / 110.4 bhp/ton / 110.4 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-lock2.8Turning circle9.1 m / 29.9 ft / 29.9 ft
Suspension frontIndependent, Coil springsSuspension rearLive axle, Coil springs
Wheels frontWheels rear
Tyres front155/80-R13Tyres rear155/80-R13
Brakes frontdiscBrakes reardrum
Brake diameter frontBrake diameter rear
Brakes detailsBraked area

Technical specifications and performance data of Lotus Seven S4

Infobox

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