Compression Ratio
FIA reaches compromise on F1 2026 engine compression ratios
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Formula 1's governing body, the FIA, has approved unanimous changes to how engine compression ratios are measured in the 2026 power units, effective from 1 June. The decision addresses concerns raised by manufacturers including Audi, Ferrari, and Honda over Mercedes' compliance during hot operating conditions. The revisions aim to ensure fairness while maintaining the 16:1 limit introduced to attract newcomers to the sport.
The FIA is seeking a vote from Formula 1 manufacturers on clarifying the 2026 engine compression ratio rules amid concerns over Mercedes' design. Mercedes team principal Toto Wolff described the controversy as a 'storm in a teacup,' emphasizing that his team kept the governing body informed throughout development. The proposed change would introduce an additional measurement at operating temperature if approved.
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Formula 1's power unit manufacturers are preparing to vote on a proposal for additional tests to measure engine compression ratios under operating conditions. The change, aimed at addressing concerns over a potential loophole in the 2026 regulations, would require compliance checks at 130 degrees Celsius starting from August 1, 2026. The vote, submitted via email, is expected to conclude within 10 days.