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Formula 1’s governing body moved to close a suspected loophole in the new engine regulations on Wednesday by proposing a change from August.
The FIA said in a statement that it had recently launched an e-vote on changing the assessment of the power unit compression ratio in running condition.
It said that from August 1st, compliance with the limit “must be demonstrated not only at ambient conditions but also at a representative operating temperature of 130 degrees Celsius”.
The subject has been a major talking point in the pre-season, with Mercedes – who insist their engine is completely legal – suspected of exploiting a loophole to gain performance through thermal expansion of components.
Mercedes supply engines to champions McLaren as well as their own works team, Williams and Renault-owned Alpine. If the proposal is accepted for August, that would still give them and customer teams the first 13 races of the 24-round season before any change.
Red Bull, who are now making their own engines, also supplies sister team Racing Bulls. Audi, Honda (Aston Martin) and Ferrari are the remaining engine manufacturers.