50 years of the Škoda 992 Junior project

In April 1964, 50 years ago Škoda launched its brand new 1000 MB sedan. A lot of variants were planned. Some of them eventually reached serial production. This racing car remained a footnote in the history of the company.


The 1000 MB was first unibody Škoda which also featured rear-wheel-drive and rear engine. A sporting version, originally called Š990 Tudor Touring Sport received the green light, and became the 1000 MBX.
Others, like the Š990STW estate and the Š990 / 991 roadster were discarded. However one of the least known offsprings of this development program is the Š992 Junior racing car.

Engineers wanted to build a single-seater monoposto to comply with the regulations of the Formula Junior category (engines with up to 1100 cm3). Work started at the end of 1963. From 1964 the category was renamed to Formula F3. The Škoda S992 complied with the ne regulation

F3 cars were allowed a four-cylinder engine, based on a production model with a single carburetor and a capacity of below 1000 cc. The gearbox had also be sourced from a normal model. The minimum weight of the completed vehicle could not be less than 400 kg.
  
The first Škoda Š992 Junior F3 racing car was completed in Mladá Boleslav in January 1964 and submitted for testing two months later. Based on a spaceframe construction with all-wheel independent suspension with coil springs and shock absorbers hidden under the skins of the body.

Thought-out design of the suspension allowed the mechanical adjustment of not only its hardness, but the ground clearance of the car. The MB OHV engine, reduced to a capacity of 999.9 cc was placed longitudinally in front of the rear axle. It featured an increased compression ratio, modified combustion chambers, different valve timing, enlarged diameter valves and an improved intake port geometry and exhaust.

The first racing appearance occured in Spring, 1963 at the Hoškovice airport race, where it was driven by factory driver, Václav Bobek. Two more cars with slightly different exterior and non-aluminium body were built in July, 1965.

While in the 1965 season the Skoda Formula 3 team had to acknowledge the superiority of the East German Melkus team, the Czech team defeated the Germans in 1966. Jaroslav Bobek won the F3 Eastern bloc series championship competitions
  
In 1967 Skoda factory drivers won silver and bronze, while in 1968 they managed to score another championship. The S992 raced until 1970.

(Photos and text are courtesy of the Polish Škoda press team)

Technical specifications
Engine: in-line, four-cylinder, OHV, liquid-cooled, cooler thrust on the front of the vehicle, positioned centrally, tilted 12 ° to the left rear wheel drive. Bore diameter of the cylinder: 72 mm, Stroke: 61.4 mm, displacement: 999.9 cc
Power supply: single Solex carburettor (ultimately Weber)
Maximum power of 72 hp at 7250 rpm. / min (from 76 to 91 hp at 8000-8600 rpm. / min)
Maximum torque 81 Nm / 4000 rpm. / min (about 100 Nm / 4500 rpm. / min)
Lubrication system: Pressure
Gearbox: four-speed, manual.
Brake system: disc Girling, Dual circuit (separate circuit front and rear wheels)
Dimensions: length 3800 mm, width 1470 mm, height 805mm , wheelbase 2380 mm (2340 mm in 1966)
Curb weight: 420 kg (405 lbs)
Chassis: tubular space frame
Suspension: independent, with adjustable hardness and ground clearance, front: two wishbones, coil springs, shock absorbers, rear: five-point, with double wishbones and guide rods, coil springs, shock absorbers
Tyres: Front 4.50×13 “rear 5,50×13” (alternatively rear 6.00×13 “) alloy wheels, Dunlop Racing
tires
Maximum speed: 192 km / h (185 to 210 km / h depending on gear ratios)
Fuel tank capacity: 2×30 liter tanks located on both sides of the driver,
Number of units built: 4: 1 prototype + 3 racing vehicles, including one using parts from the original prototype.

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