1971 Lotus Seven S4

The Lotus Seven S4 is a rear wheel drive road car, with the engine placed in the front, and a 2 door roadster bodyshell. The Lotus Seven S4's engine is a naturally aspirated petrol, 1.3 litre, overhead valve 4 cylinder with 2 valves per cylinder. In this application it produces 70 bhp (71 PS/52 kW) of power at 5700 rpm, and maximum torque of 92 N·m (68 lb·ft/9.4 kgm). A 4 speed manual gearbox supplies the power to the driven wheels. It weighs a quoted 594 kg at the kerb. Its maximum speed claimed is 160 km/h (99 mph).
Full specs

Body type
2 door roadster with 2 seats
Length
3716 mm
Weight
594 kg
Engine type
naturally aspirated petrol
Engine size
1.3 litre
Cylinders
4, Straight
Power
71 PS / 70 bhp / 52 kW @ 5700 rpm
Torque
92 Nm / 68 ft.lb / 9.4 kgm
Top speed
160 km/h / 99 mph

1971 Lotus Seven S4 specifications

1971 Lotus Seven S4 data
bodywork
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Body type	2 seater roadster
Number of doors	2
Designer
dimensions & weights
Wheelbase	2286 mm	90 inches
Track/tread (front)	1239 mm	48.8 inches
Track/tread (rear)	1308 mm	51.5 inches
Length	3716 mm	146.3 inches
Width	1537 mm	60.5 inches
Height	1086 mm	42.8 inches
Ground clearance	165 mm	6.5 inches
length:wheelbase ratio	1.63
Kerb weight	594 kg	1310 lb
Weight distribution
fuel tank capacity	34 litres	7.5 [9] UK [US] gal.
aerodynamics
Drag coefficient
Frontal area
CdA
Powertrain
engine type	naturally aspirated petrol
Engine manufacturer
Engine code
Cylinders	Straight 4
Capacity	1.3 litre 1298 cc (79.209 cu in)
Bore × Stroke	81 × 63 mm 3.19 × 2.48 in
Bore/stroke ratio	1.29
Valve gear	overhead valve (OHV) 2 valves per cylinder 8 valves in total
maximum power output (DIN)	71 PS (70 bhp) (52 kW) at 5700 rpm
maximum torque (DIN)	92 Nm (68 ft·lb) (9.4 kgm)
Specific output (DIN)	40.2 kW/litre 54.7 ps/litre 53.9 bhp/litre 0.88 bhp/cu in
Specific torque (DIN)	70.88 Nm/litre 0.86 ft·lb/cu³
Engine construction	cast iron block & head
Lubrication	wet sumped
compression ratio	9:1
Fuel system	1 We carb
bmep (brake mean effective pressure)	890.7 kPa (129.2 psi)
Maximum RPM	6000 rpm
crankshaft bearings	5
Engine coolant	Water
Unitary capacity	324.5 cc
Aspiration	Normal
Compressor	N/A
Intercooler	None
Catalytic converter	N
performance
Acceleration 0-80km/h (50mph)
Acceleration 0-60mph
Acceleration 0-100km/h
Acceleration 0-160km/h (100mph)
Standing quarter-mile
Standing kilometre
Maximum speed	160 km/h (99 mph)
Power-to-weight ratio	Higher is better 119.48 PS/tonne (1000 kg) 0.12 PS/kg 87.88 kW/tonne (1000 kg) 0.09 kW/kg 117.85 bhp/tonne (1000 kg) 0.12 bhp/kg 0.05 bhp/lb
Weight-to-power ratio	Lower is better 11.38 kg/kW 19.01 lb/bhp
fuel consumption
Fuel consumption
universal fuel consumption (calculated from the above)
litres/100km
km/litre
UK MPG
US MPG
Carbon dioxide emissions
Carbon dioxide emissions
Carfolio Calculated CO₂ ^?
VED band (UK)
CO₂ Effizienz (DE)
chassis
Engine position	front
Engine layout	longitudinal
Drive wheels	rear wheel drive
Torque split	N/A
Steering	rack & pinion
turns lock-to-lock	2.800
Turning circle
Front suspension	I.W.CS.ARB.
Rear suspension	LA.WL.CS.
Wheel size front	5.5
Wheel size rear	5.5
Tyres front	165 x 13
Tyres rear	165 x 13
Brakes F/R	Di/Dr
Front brake diameter	216 mm
Rear brake diameter	216 mm
Braked area
Gearbox	4 speed manual
Top gear ratio	1
Final drive ratio	3.77
general
Carfolio.com ID	62832
Production total
Model code
RAC rating	16.3
Insurance classification	No information available
Tax band	No information available
1971 Lotus Seven S4 added before December 1995. Last modified 2013-02-28.