The FIA has initiated an electronic vote concerning a proposed change to how the power unit compression ratio is measured during operation. This move comes amid controversy surrounding Mercedes’ ability to raise their compression ratio from 1:16 to 1:18 when the engine reaches higher temperatures.
Collaboration Between FIA and Manufacturers to Define New Testing Standards
Over recent months, the FIA worked closely with the Power Unit Manufacturers to develop a standardized method for assessing how the compression ratio alters from ambient conditions to engine running temperature. Once validated, a proposal was submitted to require adherence to the compression ratio limit at both ambient temperature and at an operating temperature of 130°C starting from August 1, 2026.
Decision Pending but Mercedes Allowed to Maintain Current Engine Setup Temporarily
The vote has been dispatched to all Power Unit Manufacturers, with results expected within ten days. Any changes will remain subject to final approval by the FIA World Motor Sport Council. Meanwhile, the planned regulation update will come into effect ahead of the 14th race at Zandvoort, allowing the Mercedes Power Unit to continue its current operation until that date.
Significance of the Compression Ratio Adjustment for Formula 1 Competition
This forthcoming regulation adjustment aims to ensure consistent enforcement of engine rules by capturing compression ratio changes during real operating conditions, potentially impacting power unit performance. The implementation timing gives teams a clear deadline to adapt their engines, marking a notable regulatory step as the season moves toward its second half, particularly at the Zandvoort round.
