Formula Junior is an open wheelformula racing class first adopted in October 1958 by the CSI (International Sporting Commission, the part of the FIA that then regulated motorsports). The class was intended to provide an entry level class where you could use inexpensive mechanical components from ordinary automobiles. The idea to form the new class came from CountGiovanni "Johnny" Lurani who saw the need of a class for single-seater racing cars where younger drivers could take their first steps. It is often speculated that this class was founded as a reaction to Italy's lack of success in the 500cc Formula Three, and although Italian marques dominated the first year of the formula, they were soon overtaken by British constructors.
The rules for the class required the cars to be powered by production-based engines with a volume of 1000 cc with a 360 kg (792 lb) car or 1100 cc with a 400 kg (880 lb) car - in practice the latter was used in almost all successful FJs (the USA adopted other cc/weight ratios but they were rarely used). Parts like engine block, head and cylinders had to come from a production car; single or twin overhead camshafts, limited slip differentials and modifications to the number of main bearings were all forbidden. The brakes and transmission also had to be production-based. Constructors were allowed to increase the number of gears, but only inside a production gearbox casing. Formula Junior was also the first racing class to require roll...... Read More