What we know about the accusations of Mercedes and Red Bull's engine trick

An Italian newspaper reported on Friday that the FIA would decide to adjust the method for measuring compression ratio before the Australian Grand Prix, provided four of the five engine manufacturers agreed.

The publication pointed to speculation that both Mercedes new engine and that used by Red Bull and produced by Ford, was benefitting from a loophole that allowed them to use a higher compression ratio - delivering more power - when the engine was running hot.

The website had claimed that as F1's governing body, the FIA, measured the compression while the engine was cold, but had suggested they had performed a u-turn on the rules and would in fact take the measurement when the engine was hot - and that the new rules would be applicable immediately.

In theory, such a practice would be virtually impossible, however, the claim had sparked interest among F1 fans and that perhaps Mercedes and Red Bull could face penalties.

However, GPblog has investigated and can declare that the story in the Italian newspaper is regarded as 'speculation'.

It is known, however, that talks are underway about a possible adjustment to the measurement method for the FIA, but that no change will come before the first race of the 2026 season, due to the fact that it is simply impossible to implement on such short notice.

Should a change in the measurement method be agreed upon, it would only take effect at a future date, giving teams the opportunity to prepare their engines accordingly. At the same time, it is far from certain that there will be any adjustment to the measurement method.

GPblog had earlier declared there was no indication that either Mercedes or Red Bull would be banned for their new power units.