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Singer Chamois

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Adapted from the English Wikipedia article Singer Chamois, available under CC BY-SA 4.0Updated 10 August 2025
Hillman Imp
Company typeAutomobile model
IndustryAutomotive
FoundedMay 3, 1963; 63 years ago (1963-05-03)
FounderRootes Group
Defunct1976 (1976)
FateProduction ended; succeeded by Chrysler Sunbeam
SuccessorChrysler Sunbeam
Headquarters
Linwood
,
Scotland, United Kingdom
Area served
United Kingdom, Europe
Key people
Michael Parkes, Tim Fry, Ken Sharpe, B. B. Winter
ProductsCompact economy car (Hillman Imp and variants)
OwnerRootes Group; later Chrysler Europe
ParentRootes Group; later Chrysler Europe

The Hillman Imp is a compact economy car that was manufactured by the Rootes Group and subsequently by Chrysler Europe between 1963 and 1976. Introduced on 3 May 1963, it became the first British mass-produced vehicle to feature an aluminium engine block combined with an aluminium cylinder head.

Conceived by Michael Parkes and Tim Fry under Rootes’ direction, the Imp was assembled at the Linwood factory in Scotland. The model lineup expanded to include variants such as the estate-style Husky, a commercial van, and a coupé version.

The Imp enjoyed moderate acclaim in both club-level and international rally competitions. In 1964, Rootes launched a homologation model known as the Rally Imp, equipped with an enlarged 998 cc power unit. Among its notable rally successes were securing first and second positions at the 1965 Tulip Rally.

Although innovative in design, the Imp suffered from reliability problems that undermined its reputation and played a role in Rootes Group’s takeover by Chrysler Europe in 1967. Production persisted until March 1976, culminating in nearly 500,000 cars sold throughout its 13-year run.

Development

Internally referred to as the APEX initiative at Rootes Group, the Imp’s development was triggered by the fuel shortages caused by the 1956 Suez Crisis. With petrol rationing impacting the UK and declining demand for larger Rootes models, there was increasing interest in compact, fuel-efficient vehicles. The BMC Mini had already entered this market segment starting production in 1959. Although work began as early as 1955, the project eventually became Rootes’ inaugural small economy car offering.

Mike Parkes and Tim Fry led the design process after presenting their concept to Rootes’ engineering director, B. B. Winter. Early proposals like "The Slug," which resembled bubble cars, were dismissed by Rootes’ board in favor of a more practical and aesthetically refined design. Rigorous testing occurred across challenging environments such as Norway, East Africa, and Canada under the supervision of Chief Development Engineer Ken Sharpe.

Rootes had previously experimented with small car designs on two occasions: first with the 1938–1939 Little Jim prototype featuring a front-engine layout powered by a 750cc engine; then post-war with the rear-engined 1949 Little Jimmy prototype using a Volkswagen-derived twin-cylinder powertrain. While these projects informed Rootes’ experience, they did not directly influence the Imp’s final development.

The Imp’s engineering centered on a 742cc engine inspired by the Coventry Climax FWMA design, initially planned to be available in three displacements: 800cc, 875cc, and 998cc. However, due to escalating engineering expenses, increased vehicle weight, and reliability issues with experimental dry-liner 998cc engines, only the 875cc variant was ultimately standardized. This meant that unlike rivals such as the Mini, the Imp offered just one engine size.

An alternative approach involving a taller engine block with an extended stroke was evaluated but considered financially impractical unless sales justified it. Some long-stroke engines were produced and later modified to 1150cc for competition purposes by drivers including Paul Emery and Andy Dawson.

Subsequent 998cc engines fitted to Rallye Imps incorporated costly wet-liner technology designed primarily for motorsport rather than everyday driving. The maximum dependable capacity for the standard engine was determined to be 948cc; nevertheless, neither this nor a proposed 928cc variant—intended for a Mark III Imp model canceled due to Chrysler’s cost reductions—were manufactured. The concept behind the 928cc engine later re-emerged in the Chrysler Sunbeam.

Mark I Imp: 1963–1965

The Hillman Imp was officially unveiled on 2 May 1963, when HRH the Duke of Edinburgh inaugurated the Linwood manufacturing facility in Renfrewshire. Following the ceremony, he drove a silver model of the Imp to Glasgow Airport. Early examples of this vehicle are displayed at the Glasgow Museum of Transport and the National Motor Museum, Beaulieu.

Both prior to and following its debut, the Imp garnered considerable media interest. In 1962, Small Car & Mini Owner emphasized its all-aluminium, water-cooled rear-mounted engine, while the Daily Express described it as "the first baby car ever built by the Rootes Group." The publication Motor Sport commended its engine design, gearbox, and competitive pricing—£508 for the base model and £532 for the deluxe variant at launch.

The "Imp" designation originated from Ailsa Craig Ltd., a marine engine producer acquired by Warsop Fram Group in 1962. Rootes Group obtained the name in exchange for a Humber Super Snipe automobile, positioning the Imp as a compact alternative to the Mini.

This model featured an innovative water-cooled four-cylinder aluminium alloy overhead camshaft engine paired with a fully synchromesh aluminium transaxle. Engine placement was inclined at 45° to reduce the center of gravity and enhance handling dynamics. Its semi-trailing arm independent rear suspension was an advanced approach to mitigate typical rear-engine oversteer, inspired by evaluations conducted on a Chevrolet Corvair. Initially, the front suspension employed swing axle geometry that caused understeer; this was later rectified by adjusting camber angles.

Sales in the UK increased from approximately 33,000 units in 1963 to 50,142 in 1964 but then declined to 42,663 in 1965 due to reliability problems linked to inadequate engine cooling. This issue tarnished the vehicle’s reputation amid fierce competition from the Mini, which sold over 1.19 million units during that decade.

The Mark I was available as a two-door saloon offered in Basic and De Luxe specifications. In October 1964, Rootes launched a premium Singer Chamois edition.

Mark II Imp: 1965–1968

In response to challenges encountered with the Mark I, Rootes Group reintroduced the Imp featuring notable mechanical and aesthetic improvements. The Mark II eliminated the pneumatic throttle linkage and automatic choke in favor of traditional systems, refined front suspension geometry, and introduced updated trim elements. Significant upgrades included a new water pump, a cylinder head with enlarged ports and valves, as well as 'Mark II' badges on the doors.

Mark III Imp: 1968–1976

Although never officially designated as "Mark III," this iteration emerged following Rootes Group’s acquisition by Chrysler Europe in 1968 and is sometimes referred to as the "Chrysler Imp." The interior received updates including a redesigned dashboard and steering wheel; the large central speedometer was replaced by a horizontal array of four circular gauges that varied according to model. Additionally, two separate controls were consolidated into a single multifunction stalk. While these ergonomic changes were less favorably received compared to earlier designs, they reflected efforts toward production streamlining.

Rootes, Chrysler and end of production

The Imp’s early reliability issues significantly damaged its market standing, with half of all units produced during its initial three years. Despite attractive pricing, distinctive styling, and economical running costs, sales did not meet expectations. Limited knowledge regarding maintenance of alloy engines and frequent Giubo coupling failures further undermined reliability perceptions. Consequently, the Imp was eclipsed by rivals such as the Mini.

The extensive financial commitment to developing the Imp and establishing the Linwood plant contributed to Rootes Group’s economic difficulties. While industrial disputes and connections with Chrysler USA were major contributors, underperformance of the Imp intensified financial losses. After Lord William Rootes passed away in 1964, Chrysler took control of Rootes by 1967 and incorporated it into Chrysler Europe. By 1968, prices for most Imp variants were reduced by over four percent despite inflation pressures in the UK.

Chrysler’s leadership is often held responsible for terminating production of the Imp in March 1976 after fewer than 441,000 units had been manufactured. Chrysler Europe itself faced challenges and was absorbed by Peugeot two years later. The Imp remained one of Britain’s longest-produced vehicles over its thirteen-year lifespan. Its successor was the Chrysler Sunbeam introduced in 1977—a three-door hatchback based on Hillman Avenger architecture—both assembled at Linwood until its closure in 1981.

Meanwhile, assembly operations at Ryton continued until December 2006 when production of Peugeot 206 models shifted to Slovakia.

Design

Developed as a direct rival to the BMC's Mini, the vehicle utilized a compact rear-engine, rear-wheel-drive configuration to optimize space for both passengers and luggage at the front and rear. A distinctive feature was its rear hatch that opened to facilitate loading luggage behind the back seat.

This model was the first British mass-produced automobile to incorporate a rear engine and also pioneered the use of a diaphragm spring clutch. Its baulk-ring synchromesh transaxle was designed to synchronize gear and shaft speeds before engagement, effectively resolving problems encountered by early Minis.

The design incorporated several uncommon elements for its time, such as a folding rear bench seat and an automatic choke—a feature seldom found in small cars outside the U.S. until the 1970s. Additionally, it included gauges for temperature, voltage, and oil pressure, instruments that were largely replaced by warning lights after the 1950s.

The engine featured an overhead camshaft layout, enhancing airflow compared to traditional OHV engines, making it highly adaptable and straightforward to tune. Performance could be enhanced through modifications like upgraded silencers and carburettors. However, Rootes' modifications for mass production resulted in an engine that was less robust than its Coventry Climax predecessor.

The Imp employed a variant of the Climax FWMA engine, whereas Lotus vehicles used the FWMC engine featuring a different cylinder head design.

Marketing

Rootes initially marketed the Imp as an innovative, premium-quality compact car intended as a secondary vehicle for wealthy households. Over time, the focus shifted toward promoting it as an ultra-economical model with simplified features aimed at reducing costs, drawing parallels with Eastern European manufacturers such as Škoda and Lada. At one stage, the basic Hillman Imp held the distinction of being Britain's most affordable new car, which temporarily increased sales figures.

Variants and "badge engineering"

Throughout its production run, Rootes (later Chrysler UK) offered four distinct body styles. The original saloon (produced from May 1963 to 1976) featured a rear window that opened upward, effectively creating a hatchback design that allowed easier access to luggage stored behind the fold-down rear seat—a rare attribute among small cars at that time. In 1965, a van version known as the "Commer Imp" was introduced. The 1967 lineup expanded with the coupe Imp Californian and an estate model derived from van bodywork called the "Hillman Husky." Although estate prototypes with extended roofs were developed, they never reached production; both van and estate variants ceased production in 1970.

To increase sales beyond their annual target of 100,000 units, Rootes introduced badge-engineered models such as the upscale Singer Chamois (launched in October 1964) and the Sunbeam Sport (introduced in October 1966), which featured a more powerful twin-carburettor engine. Many export markets branded Singer models as Sunbeams until Chrysler UK discontinued the Singer marque in May 1970. In certain countries like France, all Rootes British products—including the Imp and Husky—were marketed under the "Sunbeam" name.

The coupe closely resembled the standard model but had a less steeply angled windscreen and a fixed rear window. Although it debuted with sportier styling at the Paris Motor Show in October 1967 as the Sunbeam Stiletto, it did not provide any performance improvements over the saloon; aerodynamic efficiency was slightly better on the standard body style. The coupe design was also used for less powerful Hillman Imp Californian models (from January 1967) as well as higher-spec Singer Chamois versions.

Manufacture

The Imp marked a major and expensive venture for Rootes, which had limited recent experience in producing small cars, despite having initially entered the segment with the smaller Hillman Minx back in 1931. By the time the Imp was introduced, the Minx had transitioned into a medium-sized family vehicle. Rootes was a pioneer in implementing an aluminium engine for mass production with the Imp, a technique more intricate than simply replacing cast-iron engines. To facilitate this, Rootes established a new computer-controlled assembly facility in Linwood, Paisley, supported by UK Government Regional Assistance grants aimed at generating 6,000 jobs in a region impacted by the decline of shipbuilding.

This investment encompassed a state-of-the-art die-casting plant dedicated to aluminium engine blocks and included a shareholding in a new Pressed Steel Company plant responsible for manufacturing all body panels. Nevertheless, Linwood’s geographical position introduced logistical difficulties: engine castings had to be transported 300 miles to Ryton for machining and assembly before being returned—a 600-mile round trip—requiring complex rail scheduling to coordinate the movement of parts and finished vehicles. To help mitigate expenses, Linwood also produced body pressings for the Hillman Avenger, which were then shipped south to Ryton.

The workforce, primarily recruited from shipbuilding backgrounds, lacked specialized skills in automotive assembly, which negatively influenced product quality and dependability. Additionally, industrial relations problems, including frequent strikes, disrupted production throughout the 1960s and 1970s.

Around 500,000 Imps were manufactured overall, with half produced within the initial three years.

Overseas assembly

Complete knock-down (CKD) kits were exported for assembly in countries such as Australia, Costa Rica, Ireland, Malaysia, Malta, New Zealand, Philippines, Portugal, South Africa, Uruguay, and Venezuela. In New Zealand, Todd Motors assembled Hillmans from approximately 1964 until 1970 when Imp production ceased to prioritize manufacturing the Hillman Avenger. Todd Motors operated two final assembly lines at Petone: one shared between the Avenger and Hunter, and another dedicated to the Chrysler Valiant.

In Australia, Rootes assembled Imps at their Port Melbourne plant starting in 1964 and produced several versions:

  • PM Imp: Offered only in standard trim (1964–1965), constructed from UK Mk I CKD kits. The 1965 Super Imp introduced enhancements that were incorporated into subsequent models.
  • PA Imp ("IMP II"): Available in standard or Super trim (Feb 1966–Mar 1968), still based on UK Mk I CKD kits.
  • PB Imp ("IMP III"): Offered in standard or Super trim (1968–circa 1970), initially utilizing UK Mk I kits before transitioning to Mk II kits and engines; later batches may have exclusively used CKD Imp Sport body shells.
  • Hillman GT: Manufactured from Sunbeam Imp Sport CKD kits (1967–1968).
  • Hillman Sonic/Stiletto: A convertible model produced by Eiffel Tower Motors of Dandenong for Chrysler Australia.

These models illustrate Rootes’ approach to customizing the Imp platform for various markets through localized assembly and market-specific versions.

Variants

  • Hillman Imp Mark I (1963–1965)
  • Hillman Imp de Luxe Mark I and II (1963–68)
  • Hillman Super Imp (1965–1974)
  • Hillman Imp (1968–1976)
  • Hillman GT (1967–?), developed by Chrysler Australia based on the Singer Chamois Sport; never officially designated as "Hillman Imp GT"
  • Hillman Imp Californian (1967–1970) coupé and fastback saloon
  • Hillman Husky (1967–1970) estate version
  • Commer Imp Van (1965–1968)
  • Hillman Imp Van (1968–1970)
  • Hillman Imp Caledonian (1975-1976), limited edition (~2,000 units) in Cherry Red featuring additional accessories; offered in Super and De Luxe trims
  • Singer Chamois Mark I, II (1964–1970)
  • Singer Chamois Rallye (1965–68), rally-oriented conversion with luxury appointments and a 998cc engine
  • Singer Chamois Sport and Coupé (1967–1970)
  • Sunbeam Imp Sport (1966–1970)
  • Sunbeam Sport (1970–1976)
  • Sunbeam Chamois (export markets outside the UK)
  • Sunbeam Stiletto (1967–1972)
  • Sunbeam Californian
  • Sunbeam Imp Basic and De Luxe Mark I and II (North America)

Vehicles Equipped with Imp Mechanical Components

In a notable endurance feat from August 12 to 14, 1964, the Sunbeam Imp sports sedan (ZT-86-20) completed a coast-to-coast journey across the United States, officially endorsed by American Rodding Magazine. This event surpassed the previous "world record" set by Erwin George “Cannonball” Baker in 1933. Covering 3,011 miles between New York City and Los Angeles via newly constructed Interstate Highways, the Imp completed the run in 48 hours, 9 minutes, and 54 seconds, averaging a speed of 63.7 mph.

The Imp established a formidable reputation in rally competition when Rosemary Smith claimed victory at the 1965 Tulip Rally. This achievement motivated Rootes Group to develop a dedicated rally variant under the Hillman and Singer brands known as the Imp Rallye. Despite a disputed disqualification during the 1966 Coupe des Dames, the Imp maintained its competitive edge in motorsport. It also excelled in touring car contests, with Bill McGovern securing the British Saloon Car Championship titles consecutively in 1970, 1971, and 1972 behind the wheel of a Bevan Sunbeam Imp that received minimal factory backing.

Within UK club racing circuits, the Imp was dominant in the Special Saloon class for vehicles under 1000 cc. Renowned drivers such as Ian Forrest, Harry Simpson, Ricky Gauld, John Homewood, Roger Nathan, Gerry Birrell, Ray Payne, and Chris Barter contributed to its success. Even today, Imps continue to perform strongly in historic rally events like the HRCR Clubmans Rally Championship.

Internationally, the Imp also gained recognition—particularly across Asia—where competitors including Andrew Bryson and Pardaman Singh frequently triumphed in saloon car divisions throughout the 1980s.

During the 1970s and 1980s, the 998 cc Imp engine was modified for use in three-wheeled racing sidecars. Typical enhancements included custom exhaust systems and Twin Weber twin-choke carburetor setups. Several sidecar teams equipped with Imp-powered machines competed at Isle of Man TT races; notably, Roy Hanks achieved an eleventh-place finish in the 1976 TT 1000cc Sidecar event. The popularity of Imp engines endures within classic sidecar racing circles.

In hydroplane racing, Andy Chesman claimed the 1972 World Hydroplane Championship utilizing an Imp engine. After acquiring Greetham Engineering—a specialist firm—he upgraded the original 998 cc powerplant to deliver 125 bhp by incorporating twin Weber carburetors and increasing displacement to 1220 cc. At BP-sponsored Windermere records week in October 1972, Chesman established a new R1 Class water speed record at . This record stood until his untimely death in a power-boat accident in 1998.

Further reading

  • Morgan, Tim (May 2017). Hillman Imp: The Essential Buyers Guide. Veloce Publishing.

External links

Related profiles

HHillman ImpSSunbeam ChamoisSSunbeam SportSSunbeam Stiletto
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