Sunbeam Mk III
| Industry | Automotive |
|---|---|
| Founded | 1948 |
| Defunct | 1957 |
| Fate | Rebranded as Sunbeam Mk III in 1954 |
| Products | Sunbeam-Talbot 90, Sunbeam Mk III |
The Sunbeam-Talbot 90 was manufactured by Sunbeam-Talbot from 1948 until 1954, subsequently transitioning into the Sunbeam Mk III model produced from 1954 to 1957. Introduced alongside the smaller Sunbeam-Talbot 80, it showcased a refreshed body style offered as either a four-door sports saloon or a two-door drophead coupe, while still incorporating certain pre-war design cues from the Sunbeam-Talbot 2 Litre. Notably, the saloon featured the distinctive Aero-Minx "pillarless" rear window characterized by its reverse slope.
Throughout its production run, the model experienced three distinct versions before the name changed to Sunbeam Mk III in 1954. The Sunbeam-Talbot 90 MkIIA marked the final vehicle to bear the combined Sunbeam-Talbot branding.
Sunbeam-Talbot 90 (1948–1950)
Launched in July 1948 following previews at North American motor shows, the Sunbeam-Talbot 90 was equipped with a redesigned 1,944 cc four-cylinder engine. This power unit was evolved from the earlier Sunbeam-Talbot 2 Litre and originally traced back to the 1937 Hillman 14 design. Enhancements included a cast-iron cylinder head with overhead valves, elevating power output to at 4100 rpm. The sports saloon weighed and rested on a chassis featuring beam axles and semi-elliptic leaf springs, a widened track, and upgraded hydraulic Lockheed brakes. The steering column-mounted gear change was praised for its smoother operation.
Both saloon and drophead coupe versions were fitted with rear wheel spats. Performance assessments recorded a top speed close to , along with smooth high-speed cruising and quiet operation in intermediate gears. Although the suspension lagged behind models equipped with independent front suspension, adjustable seating improved driver comfort. Production numbers reached approximately 4,000 units during this period.
Sunbeam-Talbot 90 MkII (1950–1952)
For the September 1950 Earls Court Motor Show, the engine capacity was increased to 2267 cc by enlarging the bore from 75 mm to 81 mm. This engine block was common with the 1950 Humber Hawk, although that vehicle retained a side-valve configuration until 1954. The revised engine delivered an output of , which allowed for a taller rear axle ratio that improved cruising comfort and acceleration relative to the Humber's . This enhanced power-to-weight ratio enabled higher gearing without compromising overtaking performance.
The chassis saw an upgrade with independent front suspension supported by coil springs mounted on a new cross-member, initially available only on export models. The front bodywork was refreshed by raising the headlights to comply with international regulations and relocating fog and driving lamps to either side of the radiator grille, creating air inlets.
In a 1952 road test by The Motor magazine, a coupé version achieved a top speed of , accelerated from 0- in 20.2 seconds, and recorded fuel consumption of . The tested vehicle's price was £1393 including taxes.
A total of 5,493 units were built during this iteration.
Sunbeam-Talbot 90 MkIIA (1952–1954)
The Mk IIA variant incorporated an engine with higher compression, increasing output to . To handle greater speeds safely, braking components were enlarged and cooling efficiency was enhanced through pierced wheels. Rear wheel spats were eliminated from this version.
The drophead coupe or convertible model remains the rarest among all Sunbeam-Talbots produced. Overall production between 1952 and 1954 amounted to 10,888 units.
Sunbeam Mk III (1954–1957)
Starting in 1954, the model was rebranded, dropping the Talbot designation and sold as the Sunbeam Mk III, with the badge reading Sunbeam Supreme. Production of the drophead coupé variant ended after 1955.
The design received updates such as enlarged air intakes flanking the radiator grille and three small vents on the bonnet near the windshield. Additionally, dual-tone paint options became available. Engine output was boosted to , and an overdrive feature was introduced as an optional upgrade.
In a 1955 review by The Motor magazine, the car achieved a top speed of , accelerated from 0 to in 17.4 seconds, and demonstrated fuel efficiency of . The tested vehicle was priced at £1191 including taxes.
Castles of Leicester, Rootes Group dealers based in Leicester, offered an aftermarket modification package that relocated the gear lever to the transmission tunnel, altered the cylinder head, added a bonnet scoop, and changed the boot lid mechanism. Approximately 30 to 40 vehicles underwent this "Mk IIIS" conversion, which was not officially endorsed by the manufacturer.
Total production of the Sunbeam Mk III reached around 2,250 units.
Sporting achievements
A Sunbeam Mk II driven by Stirling Moss, Desmond Scannell, and John Cooper achieved second place in the 1952 Monte Carlo Rally.
The Sunbeam Mk III secured overall victory in the 1955 Monte Carlo Rally.
During the Alpine Rally, Stirling Moss earned the prestigious 'Coupe d'Or' for completing three consecutive runs without penalties between 1952 and 1954—initially driving a Sunbeam-Talbot 90 Mk II and later a Sunbeam Alpine. The Sunbeam-Talbot Mk II team also won the team award in 1952.
Jim Clark’s first competitive vehicle for hill climbs and sprints around southern Scotland was a Mk III. Clark eventually became a two-time Formula One World Champion and is celebrated as one of motor racing’s all-time greats.
In popular culture
A 1951 Sunbeam-Talbot 90 Drophead Coupé is prominently featured as Bunty's automobile in the British television series Father Brown (2013).