Sep.7 (GMM) More details about the shape of radical new regulations for 2013 have continued to emerge.

Earlier, it was reported that most teams have essentially agreed that the field will in future be powered by 1.6 litre, 4 cylinder turbo engines, with the cars featuring 80s-style 'ground effect' aerodynamics.

Monday's reports also said drivers will be limited to using just five of the 650 horse power engines in 2013.

The online magazine GPWeek has now revealed some additional details of the new formula.

The publication said the turbo engines will run at about 10,000rpm, and feature an efficient limit on the fuel flow -- culminating in a 'green' formula that some insiders believe might entice manufacturers back onto the grid.

KERS will also play an increasing role in F1's future regulations, with additional heat-recovery technology to likely augment the existing hybrid systems.

Additionally, the cars' sidepods will be moved forwards to increase driver protection, and the size of the wheel rims is expected to increase in future years.

The basis of the 2013 rules are likely to be outlined in more detail after a forthcoming meeting of the World Motor Sport Council.

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