Last Updated on January 2 2026, 10:39 am

Although Formula 1 is currently in its winter hibernation period, the tension beneath the surface is already rising. The reason is the new power unit regulations for 2026, which have sparked heated debate in the paddock months before the first race. At the centre of the storm is Ferrari, who have reportedly complained to the FIA about a controversial engine solution developed by Mercedes and Red Bull Powertrains, one that could have significant implications for the next World Championship.

The new 2026 engines, 1.6-litre V6 turbo hybrids with an increased electrical output of 350 kW, are among the most complex power units that Formula 1 has ever seen. Although teams were only officially permitted to begin aerodynamic development for 2026 at the beginning of 2025, work on the engines has been underway for years. As is becoming increasingly clear, Mercedes may once again have got a head start on the competition.

 

 

The Compression Ratio Loophole

At the heart of the controversy lies the compression ratio of the internal combustion engine. Under the 2026 regulations, the FIA reduced the maximum permitted compression ratio from 18.0 to 16.0 to limit performance and improve efficiency. On paper, the rule seems straightforward. In practice, however, it has opened the door to a clever interpretation.

According to multiple reports, Mercedes engineers have found a way to exceed the 16:1 compression ratio once the engine is running at full operating temperature, potentially reaching values close to 18:1, without breaking the regulations during FIA checks. This is due to the measurement method: the FIA verifies the compression ratio while the engine is cold, at ambient temperature.

During racing conditions, the thermal expansion of specific components inside the engine changes the effective geometry of the combustion chamber. The result is a higher compression ratio on the track than during scrutineering. Crucially, the FIA currently considers this approach legal, as the engines comply with the rules at the time of measurement.

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A Significant Performance Gain

The potential advantage of this solution should not be underestimated. Insiders suggest that the trick could shave up to four-tenths of a second off lap times, a significant gain in modern Formula 1, where margins are often measured in hundredths of a second. In a closely fought championship, such an advantage could determine race wins, pole positions and ultimately championships.

Ferrari is reportedly furious about the situation. According to Italian media, the Scuderia has already lodged several complaints with the FIA, arguing that the spirit of the rules is being undermined. From Ferrari’s perspective, it’s not just a matter of legality, but also of fairness, especially given the long development cycles and enormous costs associated with modern F1 power units.

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Ferrari Pushes Back

In Maranello, there is growing concern that the damage may already have been done. The company fears that closing the loophole may take six or seven races, assuming the FIA decides to intervene at all. By then, the championship battle could be effectively over.

Consequently, Ferrari is reportedly considering filing an official protest after the opening race in Melbourne, in the hope of forcing a clarification or regulatory adjustment. The problem for the Scuderia is the timing: any mid-season correction would likely come too late to negate the early advantage enjoyed by Mercedes — and potentially Red Bull — completely.

 

Mercedes’ Early FIA Approval

One crucial detail sets Mercedes apart from previous controversial Formula 1 innovations. According to insiders, the German manufacturer did not act alone or in secrecy. Instead, they reportedly presented their compression-ratio concept to the FIA at an early stage and received confirmation that it would comply with the regulations.

Given the enormous costs and development timelines involved, a risky solo effort would have been unthinkable. Only after securing regulatory approval did Mercedes fully commit to the concept. This early alignment with the FIA gives the team a strong legal position and makes it unlikely that the governing body will simply reverse its stance.

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Red Bull Follows Suit

Red Bull Powertrains is also believed to be working on a similar solution. Reports suggest that engineers who previously worked at Mercedes brought knowledge of the concept with them, enabling Red Bull to develop its own version of the trick. However, this may still leave Ferrari and other manufacturers playing catch-up.

Whether Red Bull can fully replicate Mercedes’ advantage remains unclear. What is certain is that the controversy has already reignited memories of 2014, when Mercedes dominated the early hybrid era thanks to their superior power unit design. This advantage defined the competitive landscape for years.

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A Familiar Warning Sign

For now, no one can say with certainty what the balance of power will look like in 2026. Formula 1 history is full of promising concepts that failed to deliver once the lights went out. Nevertheless, the warning signs are unmistakable.

Once again, the engines are shaping up to be the decisive factor, and, if history is anything to go by, those who get them right first may be very hard to stop.

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NEXT ARTICLE – FIA plans to reduce the power of the manufacturers

There is grave concern at the FIA over how the all new 2026 Formula One power units will perform. In a desperate bid to prevent an epic failure in the racing spectacle, F1’s governing body convened an emergency meeting with the manufacturers in Bahrain to correct the ‘over optimistic’ power output from the hybrid side of the new engines.

Concerns were first raised by Christian Horner in 2023 that the all new specification of power units would create “Frankenstein monsters” due to an over reliance on electrical output. Almost two years later the FIA’s pow wow in Bahrain sought to address this issue.

The problem is that at a number of circuits where braking is limited and the straights are long, that the cars will be incapable of generating enough electrical charge to deliver the mandated 50% of power output.

 

Concerns electrical output overstated

This would result in cars ruing out of electrical charge towards the end of the straights, visibly slowing the cars as they approached the next turn. The spectacle could be disastrous for the fans and the series would descend into farce.

Yet any reduction in the amount of electrical output had to be agreed by all but one of the PU manufacturers and such agreement could not be found. The result was both the FIA and FOM issuing statements suggesting the current F1 power cycle could be truncated and a return to V*’s introduced before even 2030.

Foiled by their attempt to introduce what would be a mere software adjustment for all the teams, the FIA issued a dictate in August which outlined how they would prevent F1 becoming a farce or dominated by a single manufacturer who has aced the new PU regulations.

FIA director of day to day operations, Nicolas Tombazis revealed: “We’ve introduced a…READ MORE ON THIS STORY