Source:REUTERS/Hamad I Mohammed
[Saba Sports News] On February 28, the FIA announced several rule adjustments for the 2026 season, with the most notable change concerning engine compression ratios. Starting June 1, compression ratio testing must pass under both cold and hot conditions at 130°C, and no cylinder can exceed a ratio of 16:1. Originally, the new regulations lowered the maximum compression ratio from the previous 18:1 to 16:1 to reduce development difficulties, making it easier for new engine manufacturers like Audi and Red Bull Powertrains.
However, the new rules had a gray area, as testing had only been conducted at cold temperatures (ambient temperature). Once the cars were on the track and the engine temperature soared to around 130°C, thermal expansion could subtly increase the geometric compression ratio to 18:1. Since the cold temperature tests were compliant, teams like Mercedes exploited this rule. Other teams, feeling disadvantaged, united to complain to the FIA. In response to this pressure, the FIA implemented strict regulations stating that any parts, combinations, or mechanisms that intentionally exceed a compression ratio of 16:1 during operation are prohibited, effectively closing the loophole.
The editor believes that the initial plan for hot testing was to take place after the summer break, but it has now been moved up to the window between the seventh race at the Canadian Grand Prix and the eighth race at the Monaco Grand Prix. This adjustment provides Mercedes with enough time to gain design advantages in the first half of the season.