Amendments to 2026 Regulations Approved Unanimously
Mercedes had been suspected of gaining an advantage
Formula One’s governing body, the FIA, alongside rival engine manufacturers, have agreed on a compromise to address the controversy involving Mercedes that had threatened to overshadow the upcoming season opener in Australia.
The sport is entering a new era marked by the most significant changes in decades to engine and chassis regulations. Engine compression ratios have become a major topic of discussion, with concerns that some teams might gain performance advantages through thermal expansion of components. There has even been talk of potential protests following the Melbourne race. Mercedes, however, have stated that any regulatory change will not affect their performance.
The FIA issued a statement on Saturday confirming that amendments to the 2026 Formula One regulations were unanimously approved via an electronic vote by its World Motor Sport Council.
“A significant effort has been invested in finding a solution to the topic of the compression ratio,”the statement said.
“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.”
Initially, the FIA had proposed enforcing compliance checks
“not only at ambient conditions but also at a representative operating temperature of 130 degrees Celsius”starting from 1 August. This August date would have meant that more than half of the 24-race season would have been completed before the new rule took effect.
Engine Manufacturers and Compression Ratio Details
Mercedes supplies V6 engines to four of the 11 teams on the grid: the 2025 champions McLaren, their own works team, Williams, and Renault-owned Alpine. The other manufacturers include Red Bull, which now produces its own engines and supplies sister team Racing Bulls; Audi; Honda (powering Aston Martin); and Ferrari, which also supplies Haas and newcomers Cadillac.
The regulations limit the engine compression ratio to 16:1, measured under cold conditions. While all engines comply with this measurement, Mercedes is suspected of having found a method to increase the effective compression ratio when the engine is operating at high temperatures, potentially gaining a significant performance advantage.
“The regulations introduced for 2026 represent one of the biggest changes in recent memory,”the FIA stated.
“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. Further evaluation and technical checks on energy management matters are ongoing.”
Additional Regulatory Amendments
The FIA also confirmed that further amendments to the sporting and financial regulations were approved alongside the technical changes.
