Before the 2026 Formula 1 season has even officially kicked off, controversy is already brewing over the new engine regulations. As winter testing in Barcelona approaches, the FIA, alongside technical experts, is investigating a potential loophole regarding the compression ratio of the combustion engine. Mercedes and Red Bull are rumored to have found a way to push this ratio higher, generating extra power.
The heart of the debate centers on the set compression ratio of 16:1 for 2026. While engines must statically meet this requirement, rival manufacturers argue that the ratio could be higher during actual racing. Mercedes and Red Bull have previously been suspected of employing such ‘tricks.’ Ferrari, Audi, and Honda have reportedly urged the FIA to implement regulatory changes ahead of the Australian GP in March. For now, however, the FIA is sticking to its current interpretation of the rules and is not intervening.
‘Discussions Still Ongoing’
A spokesperson for the motorsport federation emphasizes that this process is part of a new regulatory cycle. “As is customary with the introduction of new regulations, discussions regarding the engine and chassis are still ongoing.” A technical meeting is scheduled for January 22, just before the first test day in Barcelona. According to the FIA, this meeting is not exceptional and is not solely focused on the engine controversy. The spokesperson explains: “The meeting planned for January 22 will take place among technical experts. As always, the FIA assesses the situation to ensure that the regulations are understood and applied uniformly by all participants.”
The compression ratio in the engines of Mercedes and Red Bull could increase once the block reaches temperature. During measurements, the ratio is a ‘normal’ 16:1, but as the engine warms up, complex components are said to expand, raising the compression ratio. This translates to more performance and better fuel efficiency. The expansion of engine parts due to higher temperatures is a well-known phenomenon, yet the regulations do not clearly outline how acceptable this is.
