Formula One's governing body has proposed sweeping rule changes to take the glamour sport back to basics and open the doors to new teams and drivers from 2008.

The International Automobile Federation (FIA) issued preliminary proposals on Friday and said the 10 teams were being asked for their opinions before a meeting of its world motor sport council on June 30.

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FIA president Max Mosley outlined six main proposals in a letter to six of the team bosses, with the first objective on the list being "to improve the racing spectacle without introducing artificial rules."

The others were the elimination of driver aids to put greater emphasis on skill, measures to reduce the costs of running a top team and 'very substantially' cut the cost of operating a less competitive one.

New teams were to be encouraged in to ensure a full grid of 24 cars, rather than 20 at present.

The details suggested reducing engine capacity to 2.4 litre V8s from three litre V10s, a ban on the use of spare cars and the sanctioning of just one tyre supplier instead of two at present.

Private testing would be slashed back, limited by mileage rather than the number of days and enforced by the use of an FIA controlled electronic control unit in cars.