The compression ratio controversy will be addressed with a new test, but not until August.

The crux of the matter lies in that the Formula 1 compression ratio is not measured by sensors during engine operation, but statically. The FIA simply compares the ratio in volume in the cylinder ...

A political firestorm has been brewing in Formula 1 in recent weeks and months over whether engine manufacturers have found a loophole in the new 2026 technical regulations.

With Mercedes under scrutiny and race start fears growing, Wheatley sends a calm but pointed message.

F1’s 2026 rules set a 16:1 compression ratio limit for engine cylinders. This caps how much the engine can squeeze fuel before burning it — the more you squeeze, the hotter it gets and the more power ...

The legality over the Mercedes compression ratios – which measure how much the air-fuel mixture inside an engine cylinder can be compressed – has been of hot debate during F1 2026 pre-season ...

A technical loophole involving thermal expansion has triggered accusations, secret letters to the FIA, and a war of words between teams over who'll dominate the 2026 F1 season ...

F1 teams expect to get clarity on compression ratio saga very soon ...

Mercedes could come out on the losing side of a critical vote regarding the engine regulations as other power manufacturers ...

A late rule change could turn the 2026 season on its head.

The FIA has issued a statement on the status of the compression ratio ...