There was an unusual phenomenon during winter testing - the smoking Ferrari SF71-H. Every time the Scuderia's new car left the team's garage it trailed a plume of oily smoke, which wafted across the Circuit de Catalunya pit lane. So what exactly was going on - and why? Sky F1's Ted Kravitz explains: "Each of the Ferrari-engined cars - so that's the factory Ferrari, the Haas and the Sauber - has a letterbox shaped rectangular vent directly underneath the rain light housed within the rear crash structure. "It's there to accommodate an oil breather. "Breathers are essential parts of any power unit on every car, but this year they've been subject to a new rule which says they...
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