Formula 1 world champion Lewis Hamilton and other drivers using Mercedes power units started French Grand Prix practice with new engines on Friday but the German manufacturer kept a lid on the details raising the question: Which version of the engine are they using the old one or the new one? The latest specification engine had been due for introduction in Canada two weekends ago but that was postponed at short notice due to concerns about an unspecified 'quality issue'. That left four times world champion Hamilton, now a point behind Ferrari's Sebastian Vettel after seven races, at a disadvantage to rivals who had engine upgrades for the race in Montreal. With drivers allowed only three...
Full Story »