Formula 1's five power unit manufacturers are set to vote on a proposed tweak to how engine compression ratios are measured, which could come into force over the summer break.<br>The 2026 power unit regulations prescribe an engine compression ratio of 16:1, down from 18:1 last year. That compression ratio has always been measured at ambient temperature when the engine isn't running, so it doesn't ...<a class='more' href='https://www.motorsport.com/f1/news/f1-power-unit-manufacturers-vote-extra-engine-tests/10798618/?utm_source=RSS&utm_medium=referral&utm_campaign=RSS-F1&utm_term=News&utm_content=www'>Keep reading</a>