TRD focuses on durability of parts

Toyota Racing Development will introduce upgraded engine parts and make adjustments in power for Sunday's Sprint Cup race at Pocono Raceway to ensure durability moving forward. TRD had engine failures in the cars of contending drivers Matt Kenseth and Martin Truex Jr. last weekend at Dover International Speedway.

That brought their total for the season to six, two more than the Ford engines and four more than the Chevrolet engines. TRD senior vice president David Wilson told ESPN.com on Tuesday that four of the failures — including both at Dover and one the previous week at Charlotte — were related to the valve train.

"We probably pushed a little too hard and we need to put margin back into our engines," Wilson said by phone from TRD headquarters in Costa Mesa, Calif. "What we're doing and focusing on is durability. I have the entire group at TRD putting performance stuff on the backburner and focusing on nothing but durability." More at ESPN.com