The long-discussed engine meeting has ultimately produced no regulatory changes: the solution that allows Mercedes to increase the compression ratio under hot operating conditions, while remaining fully compliant during cold scrutineering checks, has been confirmed as legal by the FIA.
As a result, the situation remains unchanged. Mercedes, along with Red Bull Powertrains, will be allowed to start the season with a power unit capable of running a compression ratio of up to 18:1 when hot, while still passing official inspections at 16:1 when checked under cold conditions at Brixworth.
During the engine manufacturers’ meeting held on Wednesday, the FIA did not take any steps to revise its position. On the contrary, the governing body firmly defended the technical interpretation that enables Mercedes to begin the new regulatory cycle with a measurable performance advantage. According to paddock estimates, this gain is worth more than 10 horsepower, translating to roughly two tenths of a second per lap — an advantage comparable to that of an entire aerodynamic upgrade package.
The objections raised by Ferrari, Honda and Audi failed to produce any concrete outcome. One proposed solution involved introducing a sensor inside the combustion chamber, allowing the FIA to monitor compression behaviour even under hot conditions. However, this proposal did not achieve unanimous support among the manufacturers, leaving the federation without the tools needed to intervene.
As a result, a concept that some view as an ingenious engineering solution and others consider a loophole that undermines the spirit of the regulations remains perfectly legal under the current framework.
Mattia Binotto, head of Audi’s Formula 1 programme, had hoped that the engine manufacturers’ meeting would at least provide clearer guidance regarding future regulatory action. Instead, discussions stalled and ultimately reverted to maintaining the existing interpretation without any additional clarifications or commitments.
The new era of Formula 1 therefore looks set to begin under a cloud of controversy. It cannot be ruled out that one or more parties may decide to lodge a formal protest, potentially raising tensions as early as the opening Grand Prix of the season.
This engine dispute is only the first issue to surface publicly, but there are indications that other unresolved technical questions remain in the background. These could yet complicate the start of a highly anticipated regulatory cycle, adding political and sporting friction to an already complex transition for Formula 1.
