The engine industry is in an uproar over claims of a loophole in the 2026 compression regulations.
"The matter has been and is still being discussed."
Formula 1's engine regulations for 2026 have sparked early controversy following reports that Honda, Ferrari, and Audi are questioning Mercedes and Red Bull over a supposed loophole regarding compression ratios.
As reported by the German outlet motorsport-magazin.com, these three manufacturers have filed a complaint with the FIA, asserting that Mercedes and Red Bull Powertrains have discovered a method to maintain an 18:1 geometric compression ratio under the new rules, despite the stipulated limit of 16:1.
The complaint revolves around thermal expansion. Although the 2026 regulations state that compression must not exceed 16:1, the measurements are to be taken at ambient temperatures. Competitors suspect that once the engines reach their operating temperatures, the expansion of components allows Mercedes and Red Bull to effectively achieve a higher compression ratio, possibly akin to the levels seen in 2025.
Estimates mentioned in the report suggest that this advantage could equate to about 15 horsepower, potentially resulting in a time gain of up to three tenths of a second per lap at a track like Albert Park.
The FIA has confirmed that the issue is currently under active discussion. A spokesperson remarked: "Thermal expansion can affect dimensions at operating temperatures, but existing regulations do not mandate measurements under heated conditions. However, the issue has been and continues to be a topic of discussion in technical forums with the manufacturers."
French newspaper L’Equipe reports that all five 2026 power unit suppliers—Mercedes, Red Bull-Ford, Ferrari, Honda, and Audi—will convene with the FIA on Monday for an extraordinary technical session. If an agreement is reached between Mercedes and Red Bull and the governing body, other manufacturers are still expected to maintain the right to protest prior to the Australian GP.
Engineers cited in the German media warn that if the FIA rules against this interpretation, it could require Mercedes and Red Bull to mechanically adjust their compression back to 16:1, likely impacting performance since the power units have already been homologated for 2026.
The timing is particularly relevant. Red Bull’s internal power project, with support from Ford, was anticipated to encounter early challenges under the new regulations. However, Max Verstappen’s manager, Raymond Vermeulen, has downplayed these concerns. "We've heard positive things about the engine," Vermeulen stated, which now carries more weight amid increased scrutiny regarding Mercedes and Red Bull’s apparent behind-the-scenes optimism.
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The engine industry is in an uproar over claims of a loophole in the 2026 compression regulations.
Formula 1 | The 2026 engine regulations for Formula 1 have come under early scrutiny following reports that Honda, Ferrari, and Audi are contesting Mercedes and Red (…)