Red Bull and McLaren won't be happy with the news that Renault has delayed an upgrade of its power unit indefinitely, with engine boss Remi Taffin citing reliability concerns. It was anticipated that the French manufacturer would provide its customers, and its works team, with a hardware update centered around its engine's MGU-K component for the Canadian Grand Prix. The new, lighter element - which harvests energy under braking for electrical deployment - was submitted to a durability test on Renault's dyno and has not yet achieved its reliability threshold, estimated to be between 8,000 and 10,000km of trouble-free usage. Red Bull to meet Renault over engine deal after Monaco "It's...
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