- Jowett Jupiter
name = Jowett Jupiter
manufacturer = Jowett Cars Ltd
production = 1950–1954. 900 made cite book |last=Robson |first= G|title=A-Z of British Cars 1945-1980|year=2006 |publisher=Herridge |location=Devon, UK |id=ISBN 0-9541063-9-3]
class = sports car
body_style = convertible
engine = Jowett flat four, 1486 cc
transmission = 4-speed manual
length = Series 1 163 inches (4140 mm)
Series 1a 168 inches (4267 mm) cite book |last=Culshaw |first= |authorlink= |coauthors=Horrobin |title=Complete Catalogue of British Cars |year=1974 |publisher=Macmillan |location=London |id=ISBN 0-333-16689-2]
width = 62 inches (1575 mm)
height = convert|56|in|mm|abbr=on
weight = 2100 pounds (462 kilogram)
wheelbase = 93 inches (2362 mm)
Following the launch of the all new
Jowett Javelinthe company decided to use its power train in a sports car, the only one the company ever made. For the chassis design Jowett approached ERA to design one and they came up with a tubular steel fabrication based on a design by Professor Eberan von Eberhorstwho had been with Auto Union. The suspension used torsion bars front and rear and was independent at the front. On this frame Jowett built a steel and aluminium open body with a bench seat for three people. There was no external access to the boot (trunk) and the bonnet (hood) was rear hinged and opened complete with the wings.
flat fouroverhead valve engine of 1486 cc was more highly tuned than in the Javelin and had its compression ratioraised from 7.2:1 to 8.0:1 developing Auto bhp|60|0 at 4500 rpm giving the car a maximum speed of Auto mph|85|0 and a 0-50 mph time of 11.7 seconds. Two Zenith carburettorswere fitted. A four speed gearbox with column change was used.
The Jupiter was an instant success with a record-breaking class win at Le Mans in 1950, a class 1-2 in the 1951 Monte Carlo International Rally, the outright win of the 1951 Lisbon International Rally, and a class 1-2 at Dundrod in a gruelling 4-hr sports car race on public roads in September 1951 in Northern Ireland. This was a resurrection of the famous Ulster Tourist Trophy Race of 1928-1936 previously run on the convert|13.7|mi|km|1|sing=on Ards circuit. Le Mans was again class-won in 1951 and 1952, and lesser events were taken in 1952 but by 1953 newer faster cars were proving a match for the Jupiter which was after all a well-appointed touring car first and foremost.
The Mk 1a came out in late 1952 with a little more power (63 bhp) and an opening lid to a boot of larger capacity.
As well as the 731 Mk1 and 94 Mk1a made by the factory, a further 75 chassis were supplied to external coachbuilders such as Stabilimenti Farina, Ghia Suisse and Abbott of Farnham.
A car tested by the British magazine The Motor in 1950 had a top speed of convert|86.1|mph|km/h|abbr=on and could accelerate from 0-convert|60|mph|km/h|abbr=on in 18.0 seconds. A fuel consumption of convert|25.1|mpgimp|L/100 km mpgus was recorded. The test car cost £1086 including taxes. cite journal | authorlink = Unsigned |title = The Javelin Jupiter| journal =The Motor| volume = | pages = | date = November 22 1950]
A racing derivative of the Jupiter, the R1, was entered in the 1951 1500 cc sports car race at Watkins Glen, driven to first place by George Weaver. In the Le Mans 24 hour race in 1952 another example won its class at 13th overall, driven by Marcel Becquart and Gordon Wilkins. Three examples of the R1 were made - one survives.
The original Jupiter was a somewhat heavy car and this handicapped its performance. An intended successor, the R4, was made with fibreglass body and a new lighter chassis and showed the potential of being a genuine Auto mph|100|0 car but Jowett closed before the car could reach production. Three prototypes were made of which two survive.
* [http://www.jowettjupiter.co.uk/ Jowett Jupiter site]
*The Jowett Jupiter, the Car that Leaped to Fame - Edmund Nankivell published by Batsford 1981 ISBN 07134 3835 5
*Jowett Jupiter, a Car for Road, Rally and Race - Edmund Nankivell published by Penmellyn Publications 2001 ISBN 09541 1440X
*Jowett Javelin and Jupiter, the Complete Story - Edmund Nankivell and Geoff McAuley published by Crowood 2003 ISBN 186126 562X
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