Formula 1 rule change set to be implemented following backlash over Mercedes engines
Following Formula 1’s engine dispute, the FIA has confirmed a mid-season rule change. From June, a new test will be implemented, after other teams have alleged that Mercedes are taking advantage of the current rules for engine testing.
This follows the new and dramatic 2026 F1 regulation changes, which involved the compression ratio limit of 18.0 being reduced to 16.0. Some rival teams believe that Mercedes are exploiting the fact that measurements are taken when the engine is not running at full temperature.
The compression ratio is controlled in both hot and cold conditions, combating the alleged performance advantage which Mercedes have been accused of
From June 1, the new test will be carried out when the engine ambient temperature is 130 degrees. This ensures that the compression ratio is controlled in both hot and cold conditions, combating the alleged performance advantage which Mercedes have been accused of. From this test, “any component, assembly, mechanism, or integrate arrangement of components that is designed or functions to in ratio in operating conditions beyond 16.0 is prohibited”.
Initially, before pre-season testing in Bahrain, Toto Wolff (Mercedes team principal) stated that changing the power-unit regulations had the potential to be “quite damaging for the performance”. By the end of Bahrain however, he claimed: “It doesn’t change anything for us, whether we stay like this or whether we change to the new regulations, and that’s been a process.”
Following the 2026 changes to the sport, which the FIA described as “one of the biggest changes in recent memory”, the governing body outlined that the “modifications to the technical regulations follow the pre-season tests in Barcelona and Bahrain and extensive feedback received from drivers and teams”. It also assured that “further evaluation and technical checks on energy management matters are ongoing”.
The only rival team which has appeared at times to oppose the backlash Mercedes are facing is Red Bull
The only rival team which has appeared at times to oppose the backlash Mercedes are facing is Red Bull. At the start of the dispute in January, Ben Hodgkinson, Red Bull engine chief, called it “a lot of noise about nothing”, countering engine manufacturers Ferrari, Audi, and Honda.
Nikolas Tombazis, FIA single-seater director, also said: “I don’t think this topic ever needed to get to the level of attention” that it has during the off-season, because “I don’t think that we are anywhere near the levels of performance that was stated, and certainly there was no cheat or anything like that, or no allegation of anybody being illegal.”
However, it has since been suggested that Red Bull changed stance, and in February, Laurent Mekies, Red Bull team principal, claimed: “Sometimes it was felt that we were not so sure where Red Bull was standing” but “[the] simple truth is that we don’t really mind if the regs goes left or if the regs goes right.”
It is clear that this new test has the potential to affect the outcome of the season. Mercedes
has displayed strong potential for the title so far. However, although seven races will have happened before the introduction of this test, how it will impact the following 17 races
remains uncertain.
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