F1’s five power‑unit manufacturers will vote on a new method for measuring engine compression ratios, a change that could come into force during the summer break. The 2026 regulations set the compression ratio at 16:1, down from 18:1 last year, and the current measurement is taken at ambient temperature when the engine is idle.
Under the proposed tweak, the measurement process would be altered, potentially affecting how teams validate compliance with the new 16:1 ratio. The vote will determine whether the change is adopted before the next season.