1952 Jowett Jupiter Mk IA Convertible

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.

Pictures

Jowett Jupiter  -
Jowett Jupiter
Image courtesy of Edmund Nankivell

Key facts

1952 Jowett Jupiter Mk IA Convertible information summary

What body style?
2 door 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 ft.lb / 11.6 kgm @ 3000 rpm
How quick?
0-60 mph: 16.8 s
How fast?
136 km/h, 85 mph

Jowett Jupiter models

2 door convertible/​cabriolet FR 1486 cm3 71 PS 70 bhp 52 kW 686 kg

Similar models

2 door convertible/​cabriolet FR 4M 1466 cm3 949 kg
2 door convertible/​cabriolet FR 4M 1758 cm3 60 PS 59 bhp 44 kW 1115 kg
2 door convertible/​cabriolet FR 4M 1250 cm3 58 PS 57.5 bhp 43 kW
2 door convertible/​cabriolet FR 4M 1466 cm3 66 PS 65 bhp 48 kW 912 kg
1952 Jowett Jupiter Mk IA Convertible data
bodywork
Body type2 seater convertible/cabriolet
Number of doors2
Designer
dimensions & weights
mminches
Wheelbase 2362 mm 93 inches
Track/tread (front) 1321 mm 52 inches
Track/tread (rear) 1283 mm 50.5 inches
Length 4267 mm 168 inches
Width 1575 mm 62 inches
Height 1422 mm 56 inches
Ground clearance
length:wheelbase ratio 1.81
Kerb weight 860 kg 1896 lb
Weight distribution 56.1 % front
fuel tank capacity
aerodynamics
Drag coefficient
Frontal area 1.58
CdA
engine
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
Valve gear 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
sump
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
performance
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/tonne (1000 kg)
54.19 kW/tonne (1000 kg)
72.67 bhp/tonne (1000 kg)
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/100km
km/litre
UK MPG
US MPG
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
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
Braked area
Gearbox 4 speed manual
Top gear ratio 1
Final drive ratio 4.56
general
Carfolio.com 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.