The MGA Story

A New Shape for a New Era

By the early 1950s, MG was riding high on the T-Type’s success but facing a growing problem. The TD and TF were selling well, but the competition was moving fast. The Triumph TR2, launched in 1953, offered 90 bhp and 170 km/h for less money than an MGA would cost. The Austin-Healey 100, introduced the same year, was even quicker. Porsche’s 356 was redefining what a small sports car could be. Against these modern, streamlined machines, the upright, traditional T-Type was looking its age.

MG knew this. As early as 1951, Syd Enever, MG’s chief designer and a competition engineer of considerable talent, had been working on a replacement. His prototype, based on a TD chassis with a low, aerodynamic body, was the genesis of what would become the MGA. But the British Motor Corporation (BMC), which by then controlled MG, Austin-Healey, Morris, Wolseley, and Riley, was cautious. The Austin-Healey 100 had just been launched, and BMC management feared that a modern MG sports car would cannibalise Austin-Healey sales. Enever’s proposal was shelved.

It took Le Mans to change their minds.

Le Mans and the Birth of EX 182

In 1955, MG entered three specially prepared prototypes, designated EX 182, in the 24 Hours of Le Mans. These cars used the same streamlined body shape that Enever had proposed for the road car, fitted over a purpose-built chassis with the BMC B-series engine tuned for competition. The EX 182s were quick, not quick enough to win outright, but fast enough to prove that the design worked.

The 1955 Le Mans race was overshadowed by the catastrophic Mercedes-Benz accident that killed 83 spectators and driver Pierre Levegh. The disaster led to the withdrawal of several manufacturers and a fundamental reassessment of motorsport safety. But the MG team completed the event, and the EX 182’s performance demonstrated that Enever’s design was sound, practical, and ready for production.

BMC gave the green light. The MGA entered production in September 1955.

MGA 1500 (1955-1959): The Revolution

The MGA was a revelation. Where the T-Types were prewar designs with separate mudguards, running boards, and an upright stance, the MGA was a smooth, integrated, modern sports car. The envelope body, styled by Enever with input from the wider Abingdon team, was low, wide, and aerodynamically efficient. The flowing wings, recessed headlamps, and curved windscreen created a shape that was both beautiful and functional.

Underneath the skin, the MGA was more evolutionary than revolutionary. The chassis was a traditional ladder frame, two box-section steel side rails with pressed-steel crossmembers, carrying the engine, gearbox, and running gear. The front suspension used coil springs and wishbones (derived from the MG ZA Magnette saloon), while the rear used a live axle on semi-elliptic leaf springs. Drum brakes were fitted all round on the 1500.

The engine was the BMC B-series 1,489cc inline-four, a cast-iron block with an aluminium head, pushrod overhead valves, and twin SU H4 carburettors. In MGA tune, it produced 68 bhp at 5,500 rpm, modest, but the MGA weighed just 934 kg (roadster), giving it a power-to-weight ratio that made it genuinely entertaining to drive. Top speed was around 155 km/h, comfortably faster than any T-Type.

The roadster (open two-seater) was joined in 1956 by the coupe, a fixed-head version with wind-up windows, a more weatherproof cabin, and slightly better aerodynamics. The coupe was aimed at buyers who wanted the MGA’s sporting character with greater everyday practicality. It was a handsome car in its own right, with a roofline that maintained the roadster’s flowing proportions.

The MGA was an immediate success. The American market, which had embraced the T-Types, was enthusiastic. Australian buyers, who valued the MGA’s more modern road manners and improved weather protection compared to the T-Types, were equally receptive.

By the time the 1500 gave way to the 1600 in 1959, over 58,000 had been built.

MGA Twin Cam (1958-1960): Ambition Overreach

In parallel with the standard MGA, MG developed a high-performance variant, the MGA Twin Cam. The concept was sound: take the MGA’s chassis and body, fit a twin-overhead-camshaft version of the B-series engine, add disc brakes on all four wheels, and create a car capable of genuine competition success.

The Twin Cam engine was designed by MG’s engineering team and produced 108 bhp at 6,700 rpm from 1,588cc, a significant advance over the pushrod engine’s 68 bhp. The DOHC head featured hemispherical combustion chambers, larger valves, and direct tappet actuation. Combined with a 9.9:1 compression ratio and twin SU carburettors, it was a potent unit.

On the chassis side, the Twin Cam received centre-lock Dunlop disc wheels (the distinctive “pepperpot” design that has become an icon of 1950s motorsport), four-wheel Dunlop disc brakes, and a slightly revised suspension setup. The car was visually distinguishable from the standard MGA by its disc wheels and slightly different badging.

The Twin Cam was fast, 0-100 km/h in around 13 seconds and a top speed of 180 km/h, which was genuinely quick in 1958. It raced with distinction, including class victories at Le Mans, Sebring, and numerous national events.

But the Twin Cam had a problem. The high compression ratio demanded premium fuel that wasn’t always available, and owners who ran lower-octane fuel experienced pre-ignition that destroyed pistons and scored bores. Oil consumption was high. Head gasket failures were common. The engine, while brilliant when running well, earned a reputation for unreliability that damaged sales.

Only 2,111 Twin Cams were built before the model was discontinued in 1960. Many were subsequently converted to pushrod engines, a reliable MGA was preferred to a temperamental one. Today, a complete, unmodified Twin Cam with its original engine is a significant collector car.

MGA 1600 (1959-1961) and 1600 Mark II (1961-1962)

The 1600 addressed the 1500’s modest power output with a bored-out engine: 1,588cc producing 80 bhp. More importantly, it gained front disc brakes, a meaningful safety improvement that brought the MGA’s braking up to the standard set by the Twin Cam. The synchromesh gearbox was also improved, with synchro now on all four gears (the 1500 had a non-synchromesh first gear).

The 1600 Mark II, introduced in 1961, pushed power to 86 bhp through a higher compression ratio (8.9:1) and revised cylinder head porting. External identification was provided by a slightly recessed radiator grille and revised tail lights. The Mark II was the most refined and capable standard MGA, the best car in the range, if not the most produced.

Combined production of the 1600 and Mark II was approximately 43,000 units. By the time the last MGA rolled off the line in June 1962, total production had reached 101,081, making it MG’s most successful model to that point. It would soon be eclipsed by the MGB.

Competition Record

The MGA was never a purpose-built race car like the Twin Cam, but it was raced extensively and successfully in club and national competition worldwide.

Key competition highlights include:

• Le Mans, 1955: Three EX 182 prototypes entered; two finished. The cars demonstrated the design’s potential and helped secure production approval.
• Le Mans, 1959-1961: Twin Cam MGAs entered by the works team and privateer entrants achieved class victories.
• Sebring 12 Hours: Multiple class wins for both Twin Cam and pushrod MGAs.
• Australian club racing: The MGA was a mainstay of Australian club motorsport throughout the late 1950s and 1960s. Its combination of moderate power, balanced handling, and easy maintenance made it ideal for sprints, hillclimbs, and regularity events.

The MGA’s competition legacy in Australia runs deep. The MG Car Club ran dedicated MGA classes in state-level motorsport, and many of today’s vintage racing MGAs are cars that have been competing since they were new.

The MGA in Australia

The MGA arrived in Australia in 1955 and found an enthusiastic market. Australian buyers appreciated the step forward from the T-Types, the improved weather protection, better road manners, and more modern appearance made the MGA a more practical proposition for everyday use.

Australian-delivered MGAs were typically right-hand-drive, fitted with the appropriate compliance equipment for the Australian market. The roadster was the more popular body style, but the coupe had its adherents, particularly in wetter climates where the roadster’s hood was challenged.

The MG Car Club incorporated the MGA into its activities alongside the T-Types, and the two models frequently appeared together at club events. Today, the MGA is strongly represented at MGCC events across all Australian states.

Legacy

The MGA’s significance lies in what it proved: that MG could build a modern, competitive sports car without abandoning the qualities, affordability, simplicity, driving pleasure, that defined the marque. The MGA demonstrated that a British sports car could have a contemporary appearance and still be maintainable by its owner in a domestic garage.

The MGA also established the design language that the MGB would carry forward, a low, integrated body, a simple but effective chassis, and a BMC B-series engine that was shared across the corporation’s product range. The MGB was, in many ways, a refinement of the MGA’s formula.

Over 101,000 MGAs were built in seven years of production. Today, perhaps 20,000 survive worldwide. They remain one of the most beautiful sports cars of the 1950s, and their combination of style, performance, and accessibility continues to attract new enthusiasts more than sixty years after production ended.

Timeline

Year	Event
1951	Syd Enever proposes streamlined MG sports car; project shelved by BMC
1955	Three EX 182 prototypes race at Le Mans. MGA enters production (September)
1956	MGA Coupe introduced
1958	MGA Twin Cam launched with DOHC engine, disc brakes, centre-lock wheels
1959	MGA 1600 introduced: 1,588cc engine, front disc brakes
1960	Twin Cam production ends. 2,111 built. MGA 1600 De Luxe announced
1961	MGA 1600 Mark II introduced: 86 bhp, revised grille and lights
1962	MGA production ends (June). 101,081 built. Replaced by MGB