F1 Engine Rules Get Mid-Season Revision
The FIA has confirmed revisions to controversial engine rules and tweaks to the qualifying format after heated debate among teams. The mid-season rule changes to power-unit regulations aim to address concerns about performance balance and technical fairness, with manufacturers reaching a compromise on the engine controversy.
The heart of the engine dispute is a new-for-2026 rule limiting the power unit's compression ratio to 16:1, a parameter intended to make the sport more accessible to new manufacturers like Audi. A higher compression ratio can lead to more power and better fuel efficiency. Rival teams, including Ferrari, Honda, and Audi, raised concerns that Mercedes had engineered a loophole. They suspected Mercedes developed an engine where components expand at high operating temperatures, increasing the compression ratio beyond the 16:1 limit on track, despite complying with the rules during the mandated static, cold-temperature checks. Under the new agreement, which all five power unit manufacturers unanimously approved, the FIA will implement a two-stage solution. From June 1, 2026, compression ratios will be measured in both ambient ("cold") and hot (130°C) conditions. Beginning in 2027, the check will only be performed under hot operating conditions, fully closing the loophole. The June 1 start date is a compromise, meaning Mercedes and its customer teams—Alpine, Williams, and McLaren—could retain a potential performance advantage for the first part of the season. Separately, the qualifying format has been adjusted to accommodate the grid's expansion to 22 cars with the arrival of the new Cadillac team. The traditional three-part knockout structure remains, but the elimination process has been altered. To ensure the final Q3 shootout for pole position still features 10 cars, the six slowest drivers will now be eliminated in both Q1 and Q2, an increase from the previous five. The final Q3 session has also been extended by one minute, from 12 to 13 minutes.
