Who's powering who in 2014?

The latest rundown of who's running what turbo engines in 2014...

Force India
Confirmed: Mercedes
A Ferrari switch may have been strongly touted during pre-season, but Force India ultimately kept their colours nailed to the Mercedes engine mast with an extended powertrain deal for 2014 onwards - which is thought to partly explain why they re-hired Adrian Sutil over Ferrari-backed Jules Bianchi. As has been the case over the first five years of the relationship, Mercedes will supply the midfield outfit with a complete power unit (engine plus Energy Recovery System) while the 2014 deal also includes the German manufacturer's transmission system. Sauber
No deal yet confirmed
The Swiss team have been a loyal Ferrari customer for well over a decade, either side of their BMW-owned era, and that relationship is expected to continue into F1's new engine formula even though a deal hasn't officially been announced as of yet. Williams
Confirmed: Mercedes
The former World Champions will begin 2014 with their fifth different engine supplier this century after an anticipated switch to Mercedes power was confirmed after the Monaco GP. The announcement means the second incarnation of the famous Williams-Renault combination will run for just two seasons in total. Toro Rosso
Confirmed: Renault
After seven seasons powered by Ferrari, Toro Rosso will join the senior Red Bull outfit in running Renault engines for 2014 with team boss Franz Tost confident the French manufacturer will develop a "very powerful package". The new deal will also see the Fanzea-based outfit run with Red Bull gearboxes from next season. Caterham
No deal yet confirmed
The Leafield-based outfit is set to remain a Renault customer for a third straight season in 2014, bringing the French firm's roster up to four teams. The two parties are already partners outside of F1 via Caterham's sportscar division having committed to reviving the famous Alpine brand. Marussia
No deal yet confirmed
It may not have been yet made official, but a 2014 switch for Marussia to Ferrari power has been something of an open secret since the Scuderia's protégé Jules Bianchi joined the team in pre-season. The Banbury-based outfit had been Cosworth's sole remaining F1 engine customer but the British manufacturer is expected to take the introduction of costly turbo units as its cue to quit the sport.