Key facts

1952 Jowett Jupiter Mk IA Convertible information summary

What body style?
convertible/cabriolet with 2 seats
How long?
4267 mm
How heavy?
860 kg
What size engine?
1.5 litre, 1486 cm3
How many cylinders?
4, Flat
How much power?
63 PS / 62.5 bhp / 47 kW @ 4500 rpm
How much torque?
114 Nm / 84 / 11.6 kgm @ 3000 rpm
How quick?
0-60 mph: 16.8 s
How fast?
136 km/h, 85 mph


Manufacturer data not found

Jowett Jupiter models

1952 Jowett Jupiter Mk IA Convertible technical specifications


The Jowett Jupiter Mk IA Convertible is a convertible/cabriolet with 2 doors and a front mounted engine which delivers the power through the rear wheels.
The power is produced by a naturally aspirated engine of 1.5 litre capacity. This unit features overhead valve valve gear, 4 cylinder layout, and 2 valves per cylinder. It has an output of 62.5 bhp (63 PS/47 kW) of power at 4500 rpm, and maximum torque of 114 N·m (84 lb·ft/11.6 kgm) at 3000 rpm.
A 4 speed manual gearbox supplies the power to the driven wheels.
The stated kerb weight is 860 kg.
Its maximum speed stated is 136 km/h or 85 mph.
1952 Jowett Jupiter Mk IA Convertible data
1952 Jowett Jupiter Mk IA Convertible data
Body type2 seater convertible/cabriolet
Number of doors2
dimensions & weights
Wheelbase 2362 93
Track/tread (front) 1321 52
Track/tread (rear) 1283 50.5
Length 4267 168
Width 1575 62
Height 1422 56
Ground clearance
length:wheelbase ratio 1.81
Kerb weight 860 kg 1896 lb
Weight distribution 56.1 % front
fuel tank capacity
Drag coefficient
Frontal area 1.58
engine type naturally aspirated petrol
Engine manufacturer Jowett
Engine code
Cylinders Flat 4
Capacity 1.5 litre
1486 cc
(90.681 cu in)
Bore × Stroke 72.5 × 90 mm
2.85 × 3.54 in
Bore/stroke ratio 0.81
overhead valve (OHV)
2 valves per cylinder
8 valves in total
maximum power output 63 PS (62.5 bhp) (47 kW)
at 4500 rpm
Specific output 42.1 bhp/litre
0.69 bhp/cu in
maximum torque 114 Nm (84 ft·lb) (11.6 kgm)
at 3000 rpm
Specific torque 76.72 Nm/litre
0.93 ft·lb/cu3
Engine construction
compression ratio 8:1
Fuel system 2 Ze carbs
bmep (brake mean effective pressure) 964 kPa (139.8 psi)
Maximum RPM
crankshaft bearings
Engine coolant Water
Unitary capacity 371.5 cc
Aspiration Normal
Compressor N/A
Intercooler None
Catalytic converter N
Acceleration 0-80km/h (50mph) 11.7 s
Acceleration 0-60mph 16.8 s
Acceleration 0-100km/h
Acceleration 0-160km/h (100mph) -1.00 s
Standing quarter-mile 20.7 s
Standing kilometre
Maximum speed 136 km/h (85 mph)
Power-to-weight ratio 73.68 PS/g
54.19 kW/g
72.67 bhp/ton
0.03 bhp/lb
Weight-to-power ratio 18.45 kg/kW
30.82 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
turns lock-to-lock
Turning circle
Front suspension I.TB.
Rear suspension LA.TB.
Wheel size front
Wheel size rear
Tyres front
Tyres rear
Brakes F/R
Front brake diameter
Rear brake diameter
Gearbox 4 speed manual
Top gear ratio 1
Final drive ratio 4.56
general ID63987
Production total
Model code
Model family
RAC rating 13.0
Insurance classification No information available
Tax band No information available
1952 Jowett Jupiter Mk IA Convertible added before December 1995.
Last modified 2013-02-28.

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1952 Jowett Jupiter Mk IA Convertible

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