Rockingham reveals effects of one-engine rule

ROCKINGHAM, N.C. (AP) -- Kurt Busch was the first hurt by NASCAR's new "one engine" rule, going to the back of the field for the start of Sunday's race after his team switched motors.

Busch, who qualified seventh for the event, started 43rd because his team changed engines after Saturday's practice when his crew discovered a cracked cylinder. He finished 12th Sunday.

Under the new rule, teams can use just one motor during an entire race weekend. If they have to change it, they are penalized by being sent to the back of the field.

But there's also the chance of an engine not lasting through an entire race, which happened to Dale Jarrett.

Jarrett was leading Sunday, when his engine blew on lap 145, knocking him out and to a 42nd-place finish.

"It didn't give any warning," Jarrett said. "Something just let go. As hard as we race, pieces and parts break sometimes, it just doesn't happen much in our camp. I had a top-10 car, maybe a car capable of getting a win."

Jarrett had finished inside the top 10 here in the past 12 events, including one win and six second places.

Stacy Compton also blew an engine Sunday, losing his on lap 25. Both Jarrett and Compton said the problems happened too early to be attributable to the new rule.