Mercedes are at the centre of the first major controversy regarding the 2026 regulations. Specifically, they are under the microscope for developing a unique engine solution.
In short, Mercedes has found a way to increase their compression ratio above the 16:1 limit imposed by the regulations.
Crucially, the German outfit can increase the compression ratio when the car is on track – whilst still complying with the rules during stationary checks.
This solution has been met with opposition by rival manufacturers, who state this is an incorrect interpretation of the regulations. They argue that the 16:1 limit must be upheld both in the garage and on track.
Until now, he FIA have confirmed the Mercedes trick is within the bounds of the regulations.
With that said, an upcoming meeting between the FIA and manufacturers could change things.
Why Mercedes are under scrutiny
Exploiting grey areas is a natural part of Formula 1, especially on the dawn of a new rules set. Mercedes are perhaps more infamous than anyone else for developing aggressively towards a regulatory switch.
In this case, Toto Wolff’s team have found a creative solution with their engines.
Even before their compression ratio trick was made public knowledge, Mercedes power units have been heavily favoured heading into 2026.
Although estimates vary about how much time Mercedes can gain from this solution, rivals feel this loophole is significant enough to press the issue with the FIA.
Indeed, the FIA have approved the German manufacturer’s exploit until now. Mercedes were in constant dialogue with the federation throughout the conception of this idea, to ensure they were in compliance with the regulations.
After all, developing such an innovation takes many months – too long for a team to invest its resources without assurances from the FIA.
Despite the FIA’s green light, rival manufacturers are expected to raise this topic in a meeting with the FIA on January 22nd.
With the 2026 season only two months away, the other teams are not targeting a ban on the Mercedes solution before round on in Australia.
Instead, their objective is to get the FIA to prohibit the Mercedes compression trick at a later stage in the season – potentially after the summer break. Alternately, securing a ban for the 2027 season could also be on the cards.
With virtually every other manufacturer against Mercedes, this meeting could be critical for 2026 and beyond.
There is only one manufacturer that is not enthusiastically pursuing a tightening of the rules – Red Bull.
