F1 engine rules tweak for 2027 in doubt as power unit manufacturers split over 60:40 proposal

The discussion over the future direction of Formula 1’s power unit rules continues to intensify, with the proposed 2027 adjustment to the current regulations now far from guaranteed.

The FIA is pushing a revision of the existing concept, moving the power split from the originally planned 50:50 balance between internal combustion and electric energy to a 60:40 split in favour of the combustion engine. The change has been driven by early findings and feedback from drivers, which highlighted energy management challenges under the current layout.

In particular, concerns have been raised about excessive energy saving during races, including frequent lift-and-coast scenarios and situations where drivers could be forced to manage or “run out” of electric deployment on long straights.

As reported by RacingNews365 and The Race, the proposal is not currently unanimously supported within the engine manufacturer group. While there is general recognition that refinements may be needed, there is no consensus on either the timing or the extent of the change.

Some manufacturers are pushing for the adjustment to be introduced as early as 2027, while others believe a delay until 2028 would be more appropriate, citing the need to protect already advanced development programmes.

Audi is understood to have concerns over the financial and technical impact of redesigning concepts already developed around the original 50:50 ruleset. Mercedes-Benz is reportedly more open to the revision, while Honda is prepared to support whatever direction is ultimately agreed by the FIA.

Further discussions between manufacturers are scheduled to take place during the Canadian Grand Prix weekend in Montreal, where the direction of the proposal could become clearer.