An agreement has been reached which will see F1 adopt a new type of 'green' engine from 2013, it has been reported.

According to BBC Sport the proposed changes will be put to the F1 Commission this Thursday, before being rubberstamped by the FIA's World Motor Sport Council the next day.

Under the changes, it is thought the current 2.4-litre V8 will be ditched and replaced by 1.6-litre four-cylinder turbo engines with energy recovery systems and fuel restrictions - as has been rumoured for some time. It is hoped that the new rules will improve the efficiency of F1 engines by up to 50 per cent, although power outputs should stay the same, at around 750bhp.

F1 boss Bernie Ecclestone however, has already voiced his concern and has questioned if the change has been properly thought through: "We have a very good engine formula [at the moment]," he stated. "Why should we change it to something that is going to cost millions of pounds and that nobody wants and that could end up with one manufacturer getting a big advantage?"

Ferrari and Mercedes are also thought to be somewhat sceptical, although the BBC adds that a 'series of checks and balances' have been written into the new regulations to keep costs down mainly through 'resource restriction'.

It is also hoped these changes will encourage new engine manufacturers back into the sport, with Volkswagen allegedly, having been 'heavily involved' in the recent discussions which will determined the new engine rules.

No official statement has yet been released by the FIA, the governing body of the F1 World Championship.

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