Red Bull team principal Christian Horner is worried that his drivers will need up to nine engines this season following a complicated start for both Daniel Ricciardo and Daniil Kvyat. Ricciardo's engine blew at the end of last Sunday's Bahrain Grand Prix, although the Australian driver was able to make it over the line in sixth place. It was the third engine Ricciardo has used in four races. Teams are only allocated four engines per driver over a season, although they are pushing for a fifth engine. However, given Red Bull's ongoing problems with engine manufacturer Renault, Horner is not optimistic of a rapid improvement within the current rules. 'The teams agreed unanimously...
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