Formula 1, Sportrik Media - Formula 1 power unit suppliers have reached the critical March 1, 2026 deadline to submit a full technical dossier of their power units to the FIA as part of the mandatory homologation process. The deadline remains unchanged despite recent late amendments to the compression ratio regulations.
Power unit homologation has long been fixed for March 1, requiring each Power Unit Manufacturer (PUM) to provide detailed documentation covering the internal combustion engine, control electronics, turbocharger, exhaust system, energy store and MGU-K. The FIA will review the submissions and, if satisfied with regulatory compliance, grant approval within 14 days.
The submitted specification must be identical across all customer teams supplied by the same manufacturer. Fuel and lubricant specifications must also be included in the dossier for verification, ensuring full technical consistency within each supply group.
Over the winter, it emerged that Mercedes HPP had developed an interpretation that theoretically allowed operation above the prescribed 16:1 compression ratio limit. The loophole stemmed from wording in the regulations stating that measurement would be conducted at ambient temperatures, potentially permitting a higher ratio under hot running conditions without breaching the rules.
In response, rival manufacturers including Audi, Ferrari, Honda, and Red Bull Powertrains moved to push for regulatory clarification through Formula 1’s Power Unit Advisory Committee. A recent electronic vote confirmed that amendments would be introduced, as reported by RacingNews365.com.
Initially, the revised measurement procedures were scheduled for implementation in August 2026. However, updated technical regulations published one day before the homologation deadline clarified that compression ratio measurements will continue to be taken at ambient temperature until May 31, 2026.
Article C5.4.3 further specifies that from June 1 to December 31, 2026, measurements will be conducted at both ambient temperature and 130 degrees Celsius. From January 1, 2027 onward, compression ratio checks will be carried out exclusively under hot operating conditions.
This phased adjustment means manufacturers will have until after the Canadian Grand Prix to comply with the first stage of the revised framework, before the full dual-temperature measurement system comes into force ahead of the Monaco Grand Prix in early June. The regulatory clarification is expected to influence development strategies and performance management across the 2026 season.
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