FIA and F1 engine manufacturers reach compromise to close off controversial loophole

[p]The sport is entering a new ‌era with the biggest changes in decades to the engine and chassis regulations.[/p][p]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 talk of possible protests after the Melbourne race.[/p][p]Mercedes have ‌said any change will make no difference to them.[/p][p]The governing FIA said in a statement on Saturday that amendments to the 2026 Formula 1 regulations had been ‌approved unanimously by an e-vote of its World ⁠Motor Sport Council.[/p][p][b]"A significant effort ‌has been invested in finding a solution to the topic of the compression ​ratio,"[/b] it said.[/p][p][b]"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."[/b][/p][p]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 August 1. An August date would have covered more than half the 24-race season before any change was implemented.[/p][p]Mercedes supply their V6 ‌engines to four of the 11 teams - champions McLaren as well as their own works team, Williams and Renault-owned Alpine.[/p][p]The remaining manufacturers are Red Bull, Audi, Honda (Aston Martin) and Ferrari, who also supply Haas and newcomers Cadillac.[/p][p]The compression ratio of the engines is limited in the regulations to 16:1, measured in cold conditions. While all engines comply with that measurement, Mercedes are suspected of having gained a significant ‌advantage by finding a way to expand the ratio when the engine ​is running hot.[/p][p][b]"The regulations introduced for 2026 represent one of ‌the biggest changes in recent memory,"[/b] the FIA said.[/p][p][b]"All parties acknowledge that with the introduction of such significant regulatory changes, there are collective learnings to be taken from pre-season testing and the initial rounds of the 2026 championship.[/b][/p][p][b]"Further evaluation and technical checks on ⁠energy management matters are ongoing."[/b][/p][p]The ⁠FIA said additional amendments to ‌the sporting and financial regulations were also approved.[/p]