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Lotus Seven S4

(1971 model)

Brief specs of 1971 Lotus Seven S4

2-door 2-seater roadster, petrol (gasoline) 4-cylinder 8-valve straight (inline) engine, OHV (overhead valve, I-head), 1298 cm3 / 79.2 cu in / 79.2 cu in, 52.2 kW / 70.0 hp / 70.0 hp @ 5700 rpm / 5700 rpm / 5700 rpm, 92.0 N·m / 67.9 lb·ft / 67.9 lb·ft, manual 4-speed transmission, rear wheel drive, 160 km/h / 99 mph / 99 mph top speed

units: metric UK US

Basic (general) data

Marque (make)LotusIssued from1971
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

Length3716 mm / 146.3 in / 146.3 inTotal (curb) weight594 kg / 1310 lb / 1310 lb
Width1537 mm / 60.5 in / 60.5 inDry weight
Height1086 mm / 42.8 in / 42.8 inLoad capacity
Wheelbase2286 mm / 90.0 in / 90.0 inGross (max.) weight
Track front1239 mm / 48.8 in / 48.8 inTowing weight
Track rear1308 mm / 51.5 in / 51.5 inWeight distribution (front)
Ground clearance165 mm / 6.5 in / 6.5 inFuel capacity34 l / 7.5 UK gal / 9.0 US gal
Length/wheelbase ratio1.63  

Aerodynamics

Drag coefficient (Cd, Cx, Cw)Frontal area (A)1.42 m2 / 15.3 sq ft / 15.3 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 constructioncast iron block & headBore81.0 mm / 3.19 in / 3.19 in
Fuelpetrol (gasoline)Stroke63.0 mm / 2.48 in / 2.48 in
Fuel detailsBore/Stroke ratio1.29
Fuel supply1 We carbEngine displacement1298 cm3 / 79.2 cu in / 79.2 cu in
Engine Main bearings5Unitary capacity324.50 cm3/cylinder / 19.802 cu in/cylinder / 19.802 cu in/cylinder
Cam DesignOHV (overhead valve, I-head)Compression ratio9.0 : 1
SumpwetMax. output power52.2 kW / 70.0 hp / 70.0 hp at 5700 rpm / 5700 rpm / 5700 rpm
AspirationnaturalMax. torque92.0 N·m / 67.9 lb·ft / 67.9 lb·ft at
Compressor typeN/AMaximum rpm6000 rpm / 6000 rpm / 6000 rpm
IntercoolernoMax. net output (power at the wheels)20.9 kW / 28.0 hp / 28.0 hp (est.)
CoolantwaterSpecific output40.2 kW/l / 0.884 bhp/cu in / 0.884 bhp/cu in
Catalytic converternoSpecific torque70.9 N·m/l / 0.62 lb·ft/cu in / 0.62 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) speed160 km/h / 99 mph / 99 mph
Acceleration 0-60 mph (97 km/h)Power-to-weight ratio117.8 kW/ton / 89.3 bhp/ton / 89.3 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-lock2.8Turning circle9.0 m / 29.5 ft / 29.5 ft
Suspension frontIndependent, Wishbone (A-arm, control arm), Coil springs, Anti-roll (anti-sway) bar (ARB)Suspension rearLive axle, Watt's linkage, Coil springs
Wheels front5.5Wheels rear5.5
Tyres front165 x 13Tyres rear165 x 13
Brakes frontdiscBrakes reardrum
Brake diameter front216 mm / 8.5 in / 8.5 inBrake diameter rear216 mm / 8.5 in / 8.5 in
Brakes detailsBraked area

Technical specifications and performance data of Lotus Seven S4

Infobox

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