The Panhard Dyna Junior is a small sports car built by Panhard from 1952 to 1956. The car was initially offered as a roadster and later as a cabriolet. Just over 4700 were built.
In early 1951 Joseph Bell (JB) Ferguson approached Panhard with a proposal to build a small sports car for the American market. Ferguson, the brother of Harry Ferguson, had emigrated to the US and in 1951 was running New York based Fergus Motors importing and reselling of a variety of European cars including Panhards. Panhard undertook the project with Ferguson's financial support.
To reduce design costs and speed development the Dyna Junior was built with the chassis and front-wheel drive power-train from the Dyna X.
Panhard hired the carrosserie Di Rosa and their chief designer Albert Lemaitre to design the body and build a prototype. Di Rosa, known primarily for their work on trucks and buses, was able to complete the first aluminum-bodied prototype in just a few months. The car had a single door on the driver's side and a fold-down windshield. Jean Panhard reviewed the car and requested extensive changes. Ferguson, who had received pictures of the prototype, withdrew from the project. In a very short time a second prototype was ready that was approved by Panhard, and ten pre-production examples were ordered.
Panhard originally planned to build just 500 Dyna Juniors but decided to increase production in response to demand. To adapt the car to larger production volumes and reduce costs Panhard decided that the production Junior would get a steel body instead of one of aluminum. This change increased the weight of the car by more than 100 kg (220.5 lb).
The car debuted at the Paris Motor Show in October 1951 and sales officially started at the beginning of the following year. Production of the car was initially done at Di Rosa's factory, but they were unable to meet demand and Panhard moved the Junior's assembly line to their factory in Orléans. Di Rosa would close shortly afterwards.
The Dyna Junior was characterized by simple lines and few frills. Exterior decoration was limited to the grille inherited from the Dyna X. The car had exposed hinges on the trailing edge of the two passenger doors that opened "Suicide"-style. There were no external door handles, so opening the door required reaching in through the sliding plastic side windows to reach the interior latch. There was likewise no external trunk lid, with the rear storage compartment accessed by folding down the backrest of the two-place bench-seat. The interior was spartan, with a single centre-mounted dial for the speedometer and a gearshift lever sprouting from the dashboard as in the Dyna X.
Despite having just 25.7 kW (34.5 hp) the car's performance, handling, fuel economy, and affordable purchase price made the Junior popular with young car buyers.
The Dyna Junior would use two versions of the Dyna X chassis over the course of its production history. Early Juniors used the X86 chassis from the Dyna X 120 while later models used the X87 chassis from the Dyna X 130. This platform gave the Junior a wheelbase of 2,127 mm (83.7 in) and front and rear tracks of 1,220 mm (48.0 in).
The front suspension was independent with upper and lower transverse leaf springs, while the rear was a rigid trailing axle with a central pivot and torsion bars. Shock-absorbers were hydraulic Houdaille units and the brakes were nine-inch drums on all four wheels. Tires front and rear were 145 x 400. The transaxle was the four-speed manual gearbox from the Dyna X.
The Dyna Junior was powered by Panhard's air-cooled two-cylinder OHV boxer engine. The earliest cars used the 745 cc (45.5 cu in) GM750 SS3 engine that produced 24.3 kW (32.6 hp) at 5000 rpm giving a maximum speed of 120 km/h (74.6 mph). The GM750 Sprint engine that produced 26.5 kW (35.5 hp) at 5000 rpm from the same displacement was an option.
In April 1952 the larger 851 cc (51.9 cu in) GM850 38 CV engine making 27.9 kW (37.4 hp) became available, raising top speed to 125 km/h (77.7 mph). The GM 850 S 40 CV Sprint version of this engine making 30.9 kW (41.4 hp) at 5000 rpm could also be ordered.
In February 1953, the roadster was joined in Panhard's lineup by a cabriolet version that came with exterior door handles and wind-up glass side windows in place of the plastic sliders on the roadster. In March the Junior began to use the X87 chassis, and a three-seat bench seat was fitted.
In 1954 the grille from the Dyna X was replaced by an simpler oval opening with an aluminum crosspiece similar to that on the Dyna Z and the instrument panel was upgraded to two dials. In March 1954, the bumpers were changed. In June of this year the 745 cc versions were dropped.
In 1955 the car was offered with an optional MAG supercharger that raised power at 60 hp and top speed to 145 km/h. In March the roadster was dropped from the line-up.
Production of the Panhard Dyna Junior ended in April 1956.
Both the Panhard Dyna X and Dyna Junior were used as the basis for other limited-production vehicles. Specials that were based on the Junior include the following cars.
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