When will F1's engine compression ratio rules change?

The engine compression ratio rules will begin to change on June 1, 2026, with new regulations taking effect.

What new engine tests will be implemented in F1?

From June 1, 2026, F1 engines will undergo both hot and cold compression ratio tests, and from 2027, only hot tests will be performed.

Why is the FIA changing F1's engine compression ratio regulations?

The FIA is changing the engine compression ratio regulations to resolve a technical dispute and ensure fair competition with new power unit rules.

Home / Sports / FIA Settles F1 Compression Ratio Dispute

FIA Settles F1 Compression Ratio Dispute

28 Feb

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Summary

Engine compression ratio rules to change June 1, 2026.
New regulations will include both hot and cold engine tests.
Full hot testing for engine compression begins in 2027.

FIA Settles F1 Compression Ratio Dispute

The FIA has announced a resolution to Formula 1's technical dispute concerning engine compression ratios. A compromise has been reached, introducing dual hot and cold engine tests starting from June 1, 2026. This modification addresses concerns raised by teams regarding power output and compliance with the new V6 engine regulations.

Initially set at a maximum of 16:1 cold for the 2026 power unit regulations, the compression ratio has been a point of contention. The FIA's decision mandates that from June 1, 2026, the compression ratio will be measured under both cold conditions and at 130 degrees Centigrade.

Looking ahead, the governing body confirmed that by 2027, engine compression ratios will exclusively be measured when engines are operating hot. This phased approach aims to facilitate the transition for new manufacturers and maintain competitive balance within the sport.

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