This design was based heavily on the original Lotus Seven. It also used a live axle rear suspension. The De Dion tube setup was used in factory racers and some of the models offered by Caterham. The rear of the Locost is of course "inspired by" the Lotus 7. The subject car differs most significantly from the original in that it has an independent rear suspension. Additionally, the car was designed using CAD software , eliminating the measurement errors inherent to the original design.
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Technical details[ edit ] The main part of the car is a space frame chassis , which can be home-built according to the drawings and instructions in the book from rectangular 25x25 mm and 19x19 mm mild steel tubes. Several suppliers offer pre-built chassis. Flat pack kits, or sets of tubes cut to size and ready for assembly, are also available. The suspension wishbones are fabricated out of cold drawn seamless mild steel tubes. Sierra front uprights are used with some modification.
At the rear fabricated uprights support Sierra rear hubs. Coilover dampers used for the design are available at specialist suppliers.
The drivetrain usually consists of a Ford Pinto , CVH , or Zetec engine mated to a Sierra gearbox, a shortened or custom made propeller shaft , Sierra differential and driveshafts. The book design is based for the Type 9 gearbox, but the list of chassis modifications in order to fit the bigger MT75 transmission is provided on the Haynes forum.
The braking system is taken directly from Ford Sierra, with the exception of vacuum servo , which is not required for the lightweight car. The bodywork is a combination of GRP parts and sheet aluminium panels. As the supply of Ford Sierra donors in the UK is waning, the use of Mazda MX-5 is becoming more widespread, with the modifications to the chassis and suspension necessary in order to accept MX-5 components being independently published by the members of the community.
Community[ edit ] There is a community of builders, as well as parts and services suppliers, based around a forum focused on the Roadster. The forum is set up and operated by Haynes, the publishers of the book describing the design. The community is mostly UK-based, but there are builders all around the world. It is legal to drive to and from the IVA so long as the car is insured.
As the car is seen as a new build, it is not required to have an MOT test until its third year as with new retail cars. The DVLA will issue an age related number plate if a substantial portion of components were from the same donor car proof needed The DVLA will issue a NEW car plate if the car is built from all new 1 part can be re-manufactured components. Sweden[ edit ] Technically, kit cars are not allowed in Sweden, but provided that most of the components and material are sourced by the builder personally it is possible to register them as amateur built vehicles.
Converting the MacPherson strut of the Ford Sierra to a double wishbone is not allowed as it is not designed for it. Motorsport[ edit ] By 2 completed road-legal Haynes Roadsters have been used in the UK in amateur Motorsport Events run by the MSA at clubman leval at tarmac sprints and hillclimbs.
This can also be accomplished at home with little effort. Standard front wishbones should bolt right up assuming the track width of the donor axle is exactly 4" greater than the UK based Ford Escort Mk1 the book donor. The increased width exists through the rear and the cockpit, while the front end is based on the book chassis and it uses a standard nosecone. The suspension brackets can be mounted according to the layout provided by the book, but the length of the front wishbones should be customized to be sure the track width agrees with the donor axle following assembly. The increased length provides an additional two inches for the pedal box and another two inches in the engine bay.
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