Helmut Marko says Red Bull Racing is considering building its own engine, although the team has confirmed that their 2015 car will use Renault's power-unit. The Milton Keynes based outfit has been powered by the French company since 2007, having used Cosworth and Ferrari engines in 2005 and 2006. After winning the last four constructors' titles with Renault, Red Bull's 2014 season started poorly with frequent reliability issues related to the new 1.6 litre V6 Turbo power-units in winter testing. Despite having the second fastest car on the grid, the team has struggled on the straights and lost points due to retirements caused by engine problems. According to Christian Horner, Red Bull's...
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