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Williams: Rival F1 teams 'fuming' over Mercedes engine but it's fully legal
Mercedes's F1 engine compression ratio has raised concerns among rival teams, but Williams insists it's fully within the rules.

As pre-season testing got underway in Bahrain, two words dominated discussion in the Formula 1 paddock: compression ratio. Rival teams are paying close attention to Mercedes' power unit, which appears to operate within the 16:1 static test limit but achieves a higher ratio on the road.
Audi, Ferrari and Honda have written a joint letter to the FIA seeking clarification, ...
Source:Motorsport.com