With just ten days to go until the start of 2026, the Formula 1 engine war has officially ignited, with Mercedes and Red Bull at the center of the storm. Yesterday, a bombshell report from Motorsport Magazin sent shockwaves through the paddock, suggesting that the two aforementioned manufacturers may have discovered a loophole to circumvent the new technical regulations.
Several power unit manufacturers, including Ferrari, have formally requested clarifications from the FIA regarding the design choices made by their rivals. At the heart of this brewing investigation is the compression ratio of the next-generation 2026 engines.
According to rumors, Mercedes—and potentially Red Bull Powertrains—have reportedly found a “trick” to bypass the requirements set out in Article 5.4.3 of the technical regulations. This specific rule governs the geometric compression ratio, defined as the ratio between the total cylinder volume before compression and the remaining volume after compression. Under the new rules, this must be capped at 16:1, a significant reduction from the 18:1 ratio that was permitted until only a few weeks ago.
The FIA breaks its silence on the 2026 power unit dispute
The FIA has now issued a press statement that, for the moment, appears to be an attempt to calm the rising tensions:
“The matter is still under discussion in the technical forums with the engine suppliers,” they stated. “The FIA constantly monitors these issues to ensure fairness and clarity.” Crucially, the governing body also left the door open for potential mid-season regulatory shifts: “Adjustments to the rules or measurement methods may be considered in the future.”
Despite this response, it is unlikely that the controversy will die down. Reports suggest that if a definitive conclusion is not reached soon, Ferrari, Honda, and Audi are already prepared to file official protests at the Australian Grand Prix. The 2026 season opener is already one of the most anticipated races in years due to the sweeping regulation changes, and it now promises to be equally explosive off the track as it is on it.
The FIA has therefore addressed the growing friction between F1’s power unit manufacturers, acknowledging that the debate over engine compression ratios is still an active technical discussion. While the governing body is currently monitoring the situation to ensure a level playing field, they have explicitly mentioned that rule adjustments remain a possibility. With Ferrari, Honda, and Audi threatening formal protests in Melbourne, the 2026 season looks set to begin with a high-stakes legal and technical battle over the interpretation of the new power unit era.
Dec 20, 2025Luca Marini
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