Kyle Busch, who qualified on the pole for the Shelby 427 from Las Vegas Motor Speedway, blew an engine in practice Friday and will go to the back of the field.
Fellow Toyota drivers David Reutimann and Marcos Ambrose, who qualified fourth and fifth respectively, had to replace their engines and will start at the rear of the field. While Reutimann and Ambrose drive for different teams (Michael Waltrip Racing and JTG Daugherty Racing, respectively), both teams have a technical alliance.
Red Bull Racing teammates Brian Vickers and Scott Speed also replaced their engines, and will start from the rear of the field.
Overall, five Toyota teams replaced engines. While Joe Gibbs Racing builds its own engines, the other teams all use Toyota Racing Development engines.
TRD President Lee White said:
It’s a wear issue between the camshaft and lifter – it’s either a coating, lubrication, lack of lubrication, too much lubrication, not enough coating or a material situation or just the simple fact that we haven’t been testing.
TRD replaced some of the lubricants and hopes that might fix the problem. They plan to look at the engines after today’s practices.