The 2026 power unit regulations prescribe an engine compression ratio of 16:1, down from 18:1 last year. Currently, compression ratios are measured at ambient temperature when the engine is not running, but the proposed tweak could alter this methodology.
F1 Power Units to Vote on Engine Test Changes
Formula 1's five power unit manufacturers will vote on a proposed change to how engine compression ratios are measured, which could be implemented during the summer break.