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 Formula  1's governing body the FIA says the series' power unit manufacturers  have unanimously approved changes to how engine compression ratios are  measured, with revisions coming as early as 1 June. The compression ratio of the V6 combustion engines, which measures how much the air-fuel mixture inside a cylinder can be compressed, has been reduced to 16:1 for this generation of power units - partly to help make building engines more accessible to newcomers. Following a series of discussions, the FIA put up a compromise for an e-vote among the five power unit manufacturers. 

Pirelli has cancelled its two-day Formula 1 tyre test amid the escalating  international situation in Middle East, with  further potential disruption to the start of F1’s 2026 season to come.  Pirelli had an unusual wet tyre test planned for February 28-March 2 in  Bahrain (using sprinklers) before F1’s Melbourne opener with Mercedes and McLaren, but that’s now been cancelled for security reasons. Next appointment will be directly in Australia where will be  held the first official race of the F1 2026 championship as already  planned.