Key facts

1974 MG MGB information summary

What body style?
convertible/cabriolet with 2 seats
How long?
4021 mm
How heavy?
971 kg
What size engine?
1.8 litre, 1798 cm3
How many cylinders?
4, Straight
How much power?
98 PS / 97 bhp / 72 kW @ 5500 rpm
How much torque?
141 Nm / 104 / 14.4 kgm @ 2500 rpm


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MG logo

1974 MG MGB technical specifications


This vehicle has a 2 door convertible/cabriolet type body with a front positioned engine powering the rear wheels.
The 4 cylinder, overhead valve naturally aspirated engine has 2 valves per cylinder and a volume of 1.8 litres. For this model it develops power and torque figures of 97 bhp (98 PS/72 kW) at 5500 rpm and 141 Nm (104 lbft/14.4 kgm) at 2500 rpm respectively.
The engine transmits power to the wheels through a 4 speed manual with overdrive transmission.
Claimed weight at the kerb is 971 kg.
1974 MG MGB data
1974 MG MGB data
Body type2 seater convertible/cabriolet
Number of doors2
dimensions & weights
Wheelbase 2311 91
Track/tread (front) 1245 49
Track/tread (rear) 1252 49.3
Length 4021 158.3
Width 1570 61.8
Height 1295 51
Ground clearance
length:wheelbase ratio 1.74
Kerb weight 971 kg 2141 lb
Weight distribution
fuel tank capacity 50 litres 11 UK Gal 13.2 US Gal
Drag coefficient
Frontal area
engine type naturally aspirated petrol
Engine manufacturer Austin
Engine code
Cylinders Straight 4
Capacity 1.8 litre
1798 cc
(109.721 cu in)
Bore × Stroke 80.3 × 88.9 mm
3.16 × 3.5 in
Bore/stroke ratio 0.9
overhead valve (OHV)
2 valves per cylinder
8 valves in total
maximum power output
98 PS (97 bhp) (72 kW)
at 5500 rpm
Specific output
53.9 bhp/litre
0.88 bhp/cu in
maximum torque
141 Nm (104 ft·lb) (14.4 kgm)
at 2500 rpm
Specific torque
78.42 Nm/litre
0.95 ft·lb/cu3
Engine construction
compression ratio 9:1
Fuel system 2 SU carbs
bmep (brake mean effective pressure) 985.5 kPa (142.9 psi)
Maximum RPM
crankshaft bearings
Engine coolant Water
Unitary capacity 449.5 cc
Aspiration Normal
Compressor N/A
Intercooler None
Catalytic converter N
Acceleration 0-80km/h (50mph)
Acceleration 0-60mph
Acceleration 0-100km/h
Acceleration 0-160km/h (100mph)
Standing quarter-mile
Standing kilometre
Maximum speed
Power-to-weight ratio 101.29 PS/g
74.49 kW/g
99.9 bhp/ton
0.04 bhp/lb
Weight-to-power ratio 13.42 kg/kW
22.42 lb/bhp
fuel consumption
Fuel consumption
universal consumption (calculated from the above)
litres per 100km
km per litre
Carbon dioxide emissions
Carfolio Calculated CO2 ?
VED band (UK)
CO2 Effizienz (DE)
Engine position front
Engine layout longitudinal
Drive wheels rear wheel drive  
Torque split N/A
Steering rack & pinion
turns lock-to-lock
Turning circle
Front suspension I.W.CS.
Rear suspension LA.SE.
Wheel size front
Wheel size rear
Tyres front
Tyres rear
Brakes F/R Di/Dr-S
Front brake diameter
Rear brake diameter
Gearbox 4 speed manual with overdrive
Top gear ratio 0.82
Final drive ratio 3.91
general ID32373
Production total
Model code
Model family
RAC rating 16.0
Insurance classification No information available
Tax band No information available
1974 MG MGB added before December 1995.
Last modified 2013-02-28.

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1974 MG MGB

World Car Specifications