Updated Bentley Flying Spur Speed debuts Sept. 10 minus the W-12

Updated Bentley Continental Flying Spur Speed will ditch W-12 in favor of V-8 plug-in hybrid powertrain Peak power in updated Continental Flying Spur will grow 145 hp to 771 hp New output makes updated Continental Flying Spur the most powerful four-door in Bentley history Bentley is in the process of replacing its venerable W-12 engine with a V-8…