The debate surrounding the new Formula 1 engines escalated – now manufacturers and the FIA have agreed on new measurement rules: changes will come into effect in June
Shortly before the start of the 2026 season in Australia, Formula 1 engine manufacturers and the FIA, the world motorsport governing body, have agreed on a compromise. This should settle the debate about the compression ratio of the new power units, which dominated pre-season testing.
As the FIA announced on Saturday morning, all manufacturers voted unanimously in favor of a change in the measurement methodology. These adjustments will come into effect on June 1. The background to the discussion is the maximum compression ratio of 16:1 specified for the new generation of V6 combustion engines. This value was lowered, among other things, to make it easier for newcomers such as Audi to enter the racing series. However, there were recently disagreements between the manufacturers. A group led by Audi, which was also joined by Honda and Ferrari, criticized a technical interpretation of the regulations.
The issue was the possibility of maintaining the compression ratio at the required 16:1 in a cold, static state, but increasing this value in a hot operating state in order to generate a significant performance advantage. While Mercedes received assurances that their engines were completely legal, their competitors pushed for clarification before the first race.
Two-stage plan comes into force
The solution that has now been adopted stipulates that from June 1, the compression ratio will be checked in both cold and warm conditions. From the 2027 season onwards, the measurement will be taken exclusively in operating conditions at 130 degrees Celsius.
“Considerable effort has been made to find a solution to the issue of compression ratio,” said an official statement from the FIA. “This parameter, which was one of the key objectives of these regulations in order to attract new entrants to the sport, is limited in the regulations to 16:1, measured in cold conditions.”
“The FIA has worked on a compromise solution that stipulates that from June 1, 2026, the compression ratio will be checked in both hot and cold conditions, and from 2027 exclusively under operating conditions (130 degrees Celsius).”
Red Bull team principal Laurent Mekies had called for a clear statement from the FIA in the discussion. “Tell us what we are allowed to do, and the rest hardly matters: it is important to have a clear understanding of what is allowed, and then, in my opinion, every competitor should be free to achieve the result in the way they think is best.
Focus on energy management remains
In addition to engine mechanics, the FIA is also keeping an eye on the complex energy management of the 2026 cars. As the new powertrains rely much more heavily on electric power, there are concerns about the sometimes extreme energy recovery tactics that drivers will have to employ.
“The regulations introduced for 2026 represent one of the biggest changes in recent history,” the FIA continues. “All parties recognize that with the introduction of such significant regulatory changes, collective lessons must be learned from the pre-season tests and the first rounds of the 2026 championship. Further evaluations and technical reviews on energy management issues are ongoing.”
