At the start of winter testing in Bahrain, most discussions in the Formula 1 paddock revolve around two words: compression ratio. Rivals are keeping a close eye on the Mercedes power unit, which complies with the 16:1 limit during static tests, but can achieve a higher ratio while running on track.<br>Audi, Ferrari and Honda immediately asked for clarification in a joint letter to the FIA, with ...<a class='more' href='https://www.motorsport.com/f1/news/williams-rival-f1-teams-pissed-off-over-mercedes-engine-but-its-fully-legal/10796583/?utm_source=RSS&utm_medium=referral&utm_campaign=RSS-F1&utm_term=News&utm_content=www'>Keep reading</a>