Formula One to revise controversial rule at centre of Mercedes engine row

"The FIA has worked to find a compromise solution which determines that the compression ratio will be controlled in both hot and cold conditions from 1 June 2026 and subsequently only in the operating conditions from 2027 onwards. The governing body had initially proposed voting on compliance not only at ambient conditions but also at a representative operating temperature of 130 degrees Celsius from 1 August."

"Engine compression ratios have been a major talking point, with Mercedes suspected of exploiting a loophole to gain performance through the thermal expansion of components and there is talk of possible protests after the Melbourne race. Mercedes have said any change will make no difference to them."

Formula One's governing body reached a compromise with engine manufacturers regarding compression ratio regulations that had sparked controversy ahead of the 2025 season. Mercedes faced suspicion of exploiting a loophole by gaining performance through thermal expansion of engine components. The FIA approved amendments through unanimous e-vote, establishing that compression ratios will be controlled in both hot and cold conditions from June 1, 2026, with only operating conditions monitored from 2027 onward. This solution replaced an initial proposal for August implementation, which would have affected over half the season. Mercedes supplies engines to McLaren, Williams, Alpine, and their works team, while other manufacturers include Red Bull, Audi, Honda, and Ferrari.

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