1939 Jaguar SS100
|Manufacturer||SS Cars Ltd|
|Also called||SS Jaguar 2½ Litre 100 Model |
|Body and chassis|
Coupé (prototype only) 
|Engine||2663 cc (3485 cc from 1938)
straight-6 overhead valve
|Wheelbase||104 in (2,642 mm) |
|Length||153 in (3,886 mm) |
|Width||63 in (1,600 mm) |
The '100' was so named to reflect the theoretical 100 mph maximum speed of the vehicle. In common with many products of the thirties, the adoption of an animal name was deemed appropriate, and once approved by Sir William Lyons the name "Jaguar" was given to a new saloon car in 1936, and from that point to all the cars.
The chassis had a wheelbase of 8 feet 8 inches (2.64 m), and was essentially a shortened version of the one designed for the 2.5-litre saloon, a car produced in much greater numbers, and first been seen in the SS 90 of 1935. When leaving the factory it originally fitted 5.50 or 5.25 × 18 inch tyres on 18 inch wire wheels. Suspension was on half-elliptical springs all round with rigid axles. The engine was a development of the old 2.5-litre Standard pushrod unit converted from side valve to overhead valve with a new cylinder head designed by William Heynes and Harry Weslake. The power output was increased from 70 bhp (52 kW) to 100 bhp (70 kW). Twin SU carburettors were bolted directly to the cylinder head. In 1938 the engine was further enlarged to 3.5 litres and the power increased to 125 bhp (93 kW). The four-speed gearbox had synchromesh on the top 3 ratios. Brakes were by Girling. The complete car weighed just over 23 cwt (2600 pounds, 1150 kg).
On test by the Autocar magazine in 1937 the 2.5-litre (20 RAC hp rating) car was found, with the windscreen lowered, to have a maximum speed of 95 mph (153 km/h) and a 0–60 mph (97 km/h) time of 13.5 seconds. With the 3.5-litre (25 RAC hp rating) the top speed reached the magic 100 mph (160 km/h) with a best of 101 mph (163 km/h) over the quarter mile and the 0–60 mph (97 km/h) coming down to 10.4 seconds.
In 1937 the 2.5-litre car cost £395 and in 1938 the 3.5-litre £445. The coupé, of which only one was made, was listed at £595. A few examples were supplied as chassis-only to external coachbuilders.
Widely considered to be one of the most aesthetically pleasing Jaguar cars it is also one of the rarest, with only 198 of the 2.5-litre and 116 of the 3.5-litre models being made. Most stayed on the home market but 49 were exported. Cars in good condition will now regularly fetch in excess of £300,000. A near concours example was sold by auctioneers Bonhams at the Goodwood Festival of Speed back in 2007 for £199,500 but largely because of the rarity, auction prices for the SS100 have risen very strongly since then.
More recently a perfectly restored example and former Pebble Beach concours winning 1937 S.S. Jaguar 100 3½ Litre Roadster - was sold by Gooding & Co. on 17 August 2010 at their Pebble Beach auction. It fetched an astonishing £666,270 ($1,045,000).
It was on an SS100 that the famous Jaguar 'leaper' was first prominently displayed, despite an inauspicious start. In mid 1936 the first version of the Jaguar vehicle mascot was apparently described by the founder of the company as "looking like a cat shot off a fence". A later publicity photograph of the new Model 100 "Jaguar" (registration mark CKV 250) parked outside the offices of SS Cars Ltd in early 1937 shows a revised Jaguar 'leaper' mascot mounted on he radiator cap. It is this more stylised 'leaper' that became the basis for subsequent mascots and the trade mark for Jaguar Cars Ltd that has been used to the present day.
The unnamed owner of the Belgravia vintage car dealer in James Leasor's 'Aristo Autos' novels, 'They Don't Make Them Like That Any More', 'Never Had a Spanner on Her' and 'Host of Extras' drives an SS100, and the car features prominently in the books.
The late Alan Clark MP owned a Jaguar SS100, and during his time in Margaret Thatcher's government was often to be seen piloting his SS100 away from the House of Commons after late Parliamentary sittings.
Replicas and recreations
A number of replica and re-creations of the Jaguar SS100 have also been manufactured since the 1960s.
The Suffolk Sportscars  replicas/re-creations of the SS100 have been described as being the most visually and dimensionally accurate of the genre, with painstaking attention to detail. Acceptance of the Suffolk SS100 vehicles by both Jaguar clubs and specialist classic car registers  gives some credence to the description. Suffolk Sportscars are based in Woodbridge, Suffolk, United Kingdom, and the SS100 may be ordered and individually built by hand at the factory to the customer's own specifications or alternatively may be ordered in component form for skilled home assembly.
The Suffolk SS100 uses the Jaguar XK6 engine, and commonly the 4-speed Jaguar 'Short Compact' gearbox as the drivetrain, and is still in limited production today with 8-12 cars being produced each year. With exports to a number of countries worldwide which include the USA, several European nations, Australia and New Zealand, the Suffolk Sportscars SS100 is probably the most prolific replica of the Jaguar SS100. The Suffolk SS100 was designed from the outset to create an exacting 'visual facsimile' of the genuine car. The accurate dimensions and such features as the original Lucas QK596 headlamps, dummy Andre Hartford friction dampers, the original design windscreens and fly screens mean that it takes a real enthusiast to spot the differences in a passing car. Because of the increasing rarity and high value that a genuine Jaguar SS100 can command, a small number of owners with these cars have commissioned the building of identical Suffolk SS100s, allowing the owners the use of an almost identical vehicle without risking damage to the original. Suffolk Sportscars also manufacture a replica of the famous C-Type Jaguar that is similarly designed to be visually and dimensionally accurate, and uses the original 'live axle' setup of the original car for authenticity.
The Steadman TS100 is described as a 'reproduction' of the SS100 manufactured by Ottercraft Ltd in Hayle, Cornwall, United Kingdom, during the late 1980s and early 1990s. The actual build numbers for this car is unknown, but it is thought that a maximum of twenty-eight of these vehicles were assembled, and were also referred to as the Jaguar Steadman TS100. The Steadman TS100 was never intended to be a replica of the SS100 of the 1930s, but was designed to be a sports car in its own right.
With a hand-built aluminium body, the Steadman TS100 used unadapted Jaguar XJ6 running gear and was sold as a high quality, more modern version of the Jaguar SS100. Dimensionally and visually, the Steadman TS100 was quite different from the original Jaguar SS100. These differences occurred because the manufacturers were forced to change the original proportions to both accommodate the wider track of the donor car and allow the use of more readily available smaller, wider wheels. Attention was paid to styling detail during design (such as the use of appropriately large headlights) and at the time of production, the Steadman TS100 was regarded as more successful than most other evocations. With an unknown number surviving, this re-creation is a rare sight at classic car events.
The Steadman TS100 Enthusiasts Club was established in 2011  to maintain the vehicle's marque and to bring together owners from around the world.
- Motor magazine insert for the 1936 SS Jaguar range, www.jag-lovers.org Retrieved on 13 September 2014
- 1938 show-stopper: William Lyons’ Jaguar SS100 3.5-litre Coupé Prototype, 12 August 2013, www.classicdriver.com
- Culshaw; Horrobin (1974). Complete Catalogue of British Cars. London: Macmillan. ISBN 978-0-333-16689-5.
- 1938 S.S. Jaguar 100 3½ Litre, www.supercars.net Retrieved on 13 September 2014
- Paul Skilleter, Jaguar Sports Cars, pp.305 ISBN 0-85429-166-0.
- Sedgwick, M. (1989). A-Z of Cars of the 1930s. Devon, UK: Bay View Books. ISBN 978-1-870979-38-2.
- Lawrence, Mike (1996). A to Z of sports cars, 1945-1990. MotorBooks International. p. 336. ISBN 978-1-870979-81-8. Retrieved 21 August 2011.
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