Key facts

1951 Jowett Jupiter R1 information summary

What body style?
convertible/cabriolet with 2 seats
How long?
4343 mm
How heavy?
686 kg
What size engine?
1.5 litre, 1486 cm3
How many cylinders?
4, Flat
How much power?
71 PS / 70 bhp / 52 kW @ 5000 rpm
How much torque?
How fast?
161 km/h, 100 mph


Manufacturer data not found

1951 Jowett Jupiter R1 technical specifications


Jowett Jupiter R1 is a car that has a 2 door convertible/cabriolet type body with a front mounted engine powering the rear wheels.
The Jowett Jupiter R1's engine is a naturally aspirated petrol, 1.5 litre, overhead valve 4 cylinder with 2 valves per cylinder. This powerplant produces 70 bhp (71 PS/52 kW) of power at 5000 rpm.
Quoted weight at the kerb is 686 kg.
Top stated speed is 161 km/h (100 mph).
1951 Jowett Jupiter R1 data
1951 Jowett Jupiter R1 data
Body type2 seater convertible/cabriolet
Number of doors2
dimensions & weights
Wheelbase 2362 93
Track/tread (front) 1321 52
Track/tread (rear) 1321 52
Length 4343 171
Width 1575 62
Ground clearance
length:wheelbase ratio 1.84
Kerb weight 686 kg 1512 lb
Weight distribution
fuel tank capacity
Drag coefficient
Frontal area
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 71 PS (70 bhp) (52 kW)
at 5000 rpm
Specific output 47.1 bhp/litre
0.77 bhp/cu in
maximum torque
Specific torque
Engine construction
compression ratio 9.25:1
Fuel system 2 Ze carbs
bmep (brake mean effective pressure)
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)
Acceleration 0-60mph
Acceleration 0-100km/h
Acceleration 0-160km/h (100mph) -1.00 s
Standing quarter-mile
Standing kilometre
Maximum speed 161 km/h (100 mph)
Power-to-weight ratio 103.46 PS/g
76.09 kW/g
102.04 bhp/ton
0.05 bhp/lb
Weight-to-power ratio 13.14 kg/kW
21.95 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
Rear suspension
Wheel size front
Wheel size rear
Tyres front
Tyres rear
Brakes F/R
Front brake diameter
Rear brake diameter
Top gear ratio 1
Final drive ratio 4.10
general ID63778
Production total
Model code
Model family
RAC rating 13.0
Insurance classification No information available
Tax band No information available
1951 Jowett Jupiter R1 added before December 1995.
Last modified 2013-02-28.

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1951 Jowett Jupiter R1

World Car Specifications