The Lotus 31 was a

racing car Auto racing (also known as car racing, motor racing, or automobile racing) is a motorsport involving the racing of automobiles for competition. Auto racing has existed since the invention of the automobile. Races of various sorts were organise ...

produced by Lotus for the new 1-litre

Formula 3 Formula Three, also called Formula 3, abbreviated as F3, is a third-tier class of open-wheel formula racing. The various championships held in Europe, Australia, South America and Asia form an important step for many prospective Formula One driv ...

introduced in 1964, replacing the expensive

Formula Junior Formula Junior is an open wheel formula 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 ...

. The chassis was a multi-tubular

spaceframe In architecture and structural engineering, a space frame or space structure ( 3D truss) is a rigid, lightweight, truss-like structure constructed from interlocking struts in a geometric pattern. Space frames can be used to span large areas with ...

, of similar design to the 1962

Lotus 22 The Lotus 22 was a racing car built by Lotus cars in 1962, and a total of 77 cars were built. It was developed from the 1962 Lotus 20, with the major differences that it had disc brakes all round, a top link and the 'rubber donut' to the rear su ...

Formula Junior. A Ford

Cosworth Cosworth is a British automotive engineering company founded in London in 1958, specialising in high-performance internal combustion engines, powertrain, and electronics for automobile racing (motorsport) and mainstream automotive industrie ...

105E with Single Choke Weber or SU carburettors produced at 8000rpm. The 31 had little success against the more advanced

monocoque Monocoque ( ), also called structural skin, is a structural system in which loads are supported by an object's external skin, in a manner similar to an egg shell. The word ''monocoque'' is a French term for "single shell". First used for boats, ...

cars that dominated in 1964. Records show only 12 were built in 1964/5. In 1966 19 cars were built with the Chassis 22/F3. The relative simplicity and low price of the car made it an ideal training car. Motor Racing Stables at

Brands Hatch Brands Hatch is a motor racing circuit in West Kingsdown, Kent, England, United Kingdom. Originally used as a grasstrack motorcycle circuit on farmland, it hosted 12 runnings of the British Grand Prix between 1964 and 1986 and currently host ...

ran four cars to graduate students from

Lotus Cortina Lotus Cortina is the commonly used term for the Ford Cortina Lotus, a high-performance sports saloon, which was produced in the United Kingdom from 1963 to 1970 by Ford in collaboration with Lotus Cars. The original version, which was based on t ...

s. The Jim Russell Racing Driver School ran the cars at

Snetterton Snetterton is a village and civil parish in Norfolk, England. The village is about east-northeast of Thetford and southwest of Norwich. The civil parish has an area of . The United Kingdom Census 2011, 2011 Census recorded a parish population o ...

, later being recognised as a club by the RAC. The Jim Russell School ran five 31's at Brands Hatch BARC Trophy Races in July 1967.

References

31 Formula Three cars {{motorsport-stub