The 2026 power unit regulations prescribe a compression ratio of 16:1, down from 18:1 in the previous season. Currently, this ratio is measured at ambient temperature when the engine is not running, but the proposed change could alter this methodology.
F1 Power Units Vote on Engine Test Changes
Formula 1's five power unit manufacturers are set to vote on a proposal to modify how engine compression ratios are measured, with potential implementation during the summer break.