Mercedes Engine Innovation Cleared by FIA Sparks F1 Power Unit Debate

Mercedes’ new F1 engine design has been approved by the FIA, but it has stirred concern among rival teams over a potential competitive advantage.

According to reports, the Brixworth six-cylinder engine features a second micro combustion chamber that remains inactive when cold to comply with the 16:1 compression limit, but activates when hot, effectively reaching 18:1 compression during racing. The FIA confirmed the design is legal, while Mercedes insists the power unit is fully compliant.

Theoretically, the innovation could give Mercedes a measurable gain of around 10 horsepower, with additional advantage from optimised sustainable fuel chemistry. Rival teams including Ferrari, Honda, Audi and Red Bull Powertrains are reportedly exploring ways to replicate the technology, though full implementation may take until 2027. Some may accelerate development using 3D printing to produce complex engine components faster.

The Power Unit Advisory Committee (PUAC) has met to discuss potential solutions, but unanimous agreement is required for rule changes. Teams may seek adjustments through the Additional Development and Upgrade Opportunities (ADUO) framework to avoid breaching spending limits while closing the performance gap.

Mercedes CEO Toto Wolff has defended the M17 E Performance power unit, saying competitors must catch up. Meanwhile, Formula 1 CEO Stefano Domenicali faces the challenge of balancing regulatory fairness with the start of the era of agile F1 cars.

Adjustments to fuel calorific values could offer a temporary compromise, as FIA energy meters measure total energy rather than flow. F1 teams and fans will have to wait to see how the situation unfolds on the grid this season.

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