FIA considers early rule change over Mercedes engine ahead of Monaco. The FIA could bring forward new engine testing rules following controversy over Mercedes’ compression ratio.

A further regulatory tweak could be introduced earlier than expected following the FIA’s recent decision regarding the Mercedes power unit.

After weeks of controversy and heated discussion in the Formula 1 paddock, it initially appeared that a solution had been found concerning the case linked to the compression ratio used by Mercedes. Responding to requests from rival manufacturers — who had pushed for the introduction of high-temperature tests to verify the alleged “trick” attributed to the Silver Arrows — the FIA had decided to introduce additional checks at 130°C starting from August.

However, just days ahead of the Melbourne race weekend, new reports suggest that the governing body may revise its timeline in order to avoid potential protests during the early part of the season.

Early regulation change could limit Mercedes engine advantage

According to Motorsport Magazin, the introduction of the additional high-temperature tests could be brought forward to 1 June, just days before the Monaco Grand Prix. Such a move would represent a significant acceleration compared to the original August implementation date.

In addition, from 2027 onwards, tests conducted at ambient temperature could reportedly be removed altogether, leaving only checks performed under so-called “real usage” conditions. The aim would be to ensure that all power units are evaluated under parameters that more closely reflect actual operating scenarios on track.

If confirmed through the required vote involving all engine manufacturers on the grid, this proposal could effectively eliminate any potential advantage Mercedes may have gained from the much-discussed variable compression ratio concept that has dominated technical debates in recent months.

For now, official confirmation will only come once the formal voting process has been completed and the FIA releases the relevant communications. Whatever the final outcome, the Mercedes engine case is set to remain a major talking point in Formula 1, with teams, engineers and fans likely to continue analysing every regulatory detail for the foreseeable future.