Dec.23 (GMM) The 2026 power unit controversy has intensified amid claims that Mercedes is not alone in exploiting a potential loophole, but may still emerge as the biggest beneficiary.
According to Italy’s Corriere dello Sport, Red Bull Powertrains has also been attempting to reproduce the same system that allegedly allows Mercedes engines to reach an effective compression ratio close to 18:1 under running conditions, despite the regulatory limit of 16:1.
“Seven months ago, a Mercedes engineer hired by Red Bull Powertrains shared this secret. Red Bull has since tried to reproduce this system,” the newspaper reports.
However, it adds that the task has proven far from straightforward. Mercedes is said to have been working on the concept for more than a year and has built up a significant lead, while Red Bull has so far failed to replicate the same effect in the real world.
“Red Bull have not yet managed to get close to an 18:1 compression ratio while driving. Mercedes has achieved this,” Corriere dello Sport claims.
If the interpretation is upheld, the advantage would extend beyond Mercedes works cars to all customer teams using the German manufacturer’s power unit in 2026, including McLaren, Williams and new customer Alpine.
A central problem, according to the Italian daily, is enforcement. The regulations specify that compression ratio checks are carried out at room temperature, creating a grey area once engines reach operating temperatures.
“The manufacturers who ask the FIA for clarification indicate that the cars must always comply with the rules. However, it is difficult to prove this, even after a protest,” the report states.
Corriere dello Sport says the regulations themselves leave space for “this trick”.
“It is specifically stated in the regulations that the check is carried out at room temperature. This indirectly leaves room for free interpretations, and this was not the case with the old regulations.”
With eight Mercedes-powered cars potentially enjoying a power advantage, concern among rival manufacturers is growing.
“The teams try to solve these kinds of problems through weekly meetings. The concern now is that the eight cars with Mercedes engines will have more power,” the report adds.
The FIA is now described as facing a major dilemma. Outlawing the system could severely handicap Mercedes, which is believed to have designed its 2026 power unit around the concept. Allowing it, however, risks triggering protests and political fallout once the season begins.
According to Corriere dello Sport, a compromise is being discussed – permitting Mercedes to use the system in 2026 only, provided it formally commits to abandoning it for 2027. Such a solution would likely allow Mercedes-powered teams to benefit for one season, a prospect that has already drawn strong opposition from rivals.
Join Grand Prix Tours in Austin, Texas for the high-energy 2026 United States Grand Prix at Circuit of the Americas. Experience nonstop action on one of Formula 1’s most exciting tracks, featuring dramatic elevation changes, thrilling overtakes, and a packed race weekend. Off the track, enjoy a festival atmosphere with live music, world-famous BBQ, and buzzing nightlife. Your Grand Prix Tours package includes a fully curated race weekend, highlighted by exclusive access to our private F1 Celebrity Talk Show, where guests gain insider insights and behind-the-scenes perspectives. With demand soaring and this event quickly becoming a modern American racing tradition, now is the time to secure your spot for an unforgettable Austin Grand Prix experience.
SHOW PACKAGES
There are motorsport events, and then there is the Indianapolis 500, the "Greatest Spectacle in Racing." Next year marks Grand Prix Tours' 42nd Indianapolis 500 tour and our decades of experience and local connections provide exclusive access that few fans ever enjoy, including police escorts on race day, a Dallara IndyCar Factory tour, Gasoline Alley and Legends Day, the Driver Introduction Ceremony, and a private dinner with former Indy driver Derek Daly. Combined with excellent hotel accommodations, seamless event planning, and Grand Prix Tours' signature service, this is far more than a race weekend; it's a once-in-a-lifetime motorsport experience. With tour spaces limited each year, we encourage you to reserve your place early for the 111th Indianapolis 500.
SHOW PACKAGES
Experience Formula 1 at its most iconic with an unforgettable trip to the 2027 Grand Prix de Monaco. Feel the excitement as the world’s best drivers race through the legendary streets of Monte Carlo, surrounded by superyachts, Mediterranean views, and the unmistakable glamour of Monaco. From incredible race viewing to carefully selected accommodations, Grand Prix Tours brings you closer to the action at one of the most prestigious and spectacular events in all of motorsport.
SHOW PACKAGES
The 24 Hours of Le Mans is the ultimate test of speed, strategy, and endurance. Watch the world's top manufacturers battle for 24 nonstop hours in one of motorsport's most prestigious events. With Grand Prix Tours handling your accommodations, transfers, and ticket options, all that's left is to experience this unforgettable bucket-list race.
SHOW PACKAGES
Feel the roar of Formula 1 at its spiritual home. Silverstone is one of the fastest and most demanding circuits in the world, where brave overtakes, lightning-fast direction changes, and flat-out commitment separate the best from the rest. Combined with the electric atmosphere created by hundreds of thousands of passionate fans, the British Grand Prix delivers a race weekend unlike any other.
SHOW PACKAGES