id="story_continues_1" itemprop="description"> Formula 1 is introducing arguably the biggest set of rule changes in its history this season. Most affected are the engines as the sport goes further than ever before to embrace 'green' technology. But the appearance of the cars is changing, too. Here, BBC Sport highlights the key things to look out for in 2014. Engines, Ers and unreliability First things first, the 2.4-litre naturally aspirated V8s, which have been in use since 2006, have been replaced by 1.6-litre V6 turbos. After several years of a freeze on engine development, engine power will now be a performance differentiator again. And part of the new rules...
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