Former Arizona running back Ka’Deem Carey runs a drill at the NFL football scouting combine in Indianapolis. Carey posted a 4.7-second time in the 40-yard dash, two-tenths of a second slower that what he aimed for.

Michael Conroy / The Associated Press

INDIANAPOLIS — Ka’Deem Carey came to the NFL scouting combine knowing the fastest way to improve his third-round projection was to run a blazing 40-yard dash.

So much for that.

The former Arizona Wildcat ran a 4.7-second 40-yard dash Sunday at Lucas Oil Stadium, slower than two dozen of his running back peers and far off Carey’s hoped-for time.

“A 4.5 would be just solid, knowing that I’ve got that getaway speed, and the film speaks for the rest,” Carey said Friday. “They feel comfortable with the way I play; they just want to know if I can get away from that last defender and actually bring the six points home.”

Carey’s speed was a question mark before he ran the 40-yard dash. He said Friday he wanted “just to separate myself and put myself solid in that first round” with a fast time.

Since declaring for the NFL after his junior season, Carey had been training with a speed coach in Carlsbad, Calif.

UA coach Rich Rodriguez called Carey the best running back in the nation — after all, he gained 3,814 yards and scored 42 touchdowns his last two seasons — but cautioned that he “won’t be a guy that wows you at the combine.”

Carey was around the middle of the pack in the day’s other drills, posting a 32ƒ-inch vertical leap, a 115-inch broad jump and performed 19 repetitions in the bench press.

Kent State running back Dri Archer led all rushers with a 4.26-second time, which fell two-hundredths of a second short of Chris Johnson’s combine record. Ohio State’s Carlos Hyde, thought by many to be the top running back selected in the May draft, ran a 4.66.

Pac-12 running backs fared better than Carey. Washington’s Bishop Sankey and Stanford’s Tyler Gaffney each ran a 4.49, one one-hundredth of a second faster than Oregon’s De’Anthony Thomas. USC’s Silas Redd ran the same time as Carey.

Boston College’s Andre Williams, who led the nation in rushing this year, ran a 4.56.

Patrick Finley covers the NFL for the Chicago Sun-Times. On Twitter @patrickfinley.