FIA issues update on F1 engine row with key vote set to take place
The FIA has confirmed that a vote on a proposed change to the assessment of the power unit compression ratio in running condition will take place
The FIA has confirmed that the F1 engine manufacturers will vote on a proposed change how engine compression ratios are measured.
If confirmed the change could be introduced as soon as the summer break in August this year.
Mercedes has been at the centre of an engine row with rivals accusing them of finding a loophole in the engine regulations for 2026 which gives them an advantage this year.
The dispute over compression ratios has arisen amid claims from rival manufacturers that two manufactureres may have uncovered a method of achieving figures beyond the theoretical ceiling set out in the all-new 2026 regulations.
Under the revised rules, the maximum compression ratio has been reduced from 18.0 to 16.0. However, checks are conducted with the engine below full operating temperature, opening the door to questions about how the limit is being interpreted and enforced.
Following a meeting held by the Power Unit Advisory Committee (PUAC) along with the FIA and F1's five engine manufacturers, Mercedes, Honda, Red Bull Powertrains, Ferrari and Audi a vote will now take place to decide whether to adopt a new proposal that would mean the compression ratio would need to be measured in both conditions.
In a statement released on Wednesday afternoon saying: "Over recent weeks and months, the FIA and the Power Unit Manufacturers have collaboratively developed a methodology to quantify how the compression ratio changes from ambient to operating conditions.
"Following validation of this approach, a proposal has been submitted whereby, from 1 August 2026, compliance with the compression ratio limit must be demonstrated not only at ambient conditions, but also at a representative operating temperature of 130°C.
"The vote has been submitted to the Power Unit Manufacturers, and its outcome is expected within the next 10 days and will be communicated in due course. As with all Formula 1 regulatory changes, any amendment remains subject to final approval by the FIA World Motor Sport Council."
