NEWTON, Iowa -- Tony Kanaan initially wasn't a proponent of heat races to determine the starting lineup for the Iowa Corn Indy 250 at Iowa Speedway.

"My mom always told me, and I remember when I was a little kid, I would never try any new type of food," the 2010 race winner said. "I would say, "I don't like it.' And she would always say, 'You can't say you don't like before you try it.' We'll see. It will be different."

Lap times from the second 45-minute session (3:30 p.m. ET) determined the groups for the three heat races starting at 7:15 p.m. (ET) that will set the starting lineup for the race under the lights June 23. Listen to the IMS Radio Network's call and follow real-time Timing & Scoring on www.indycar.com.

Click it: Iowa Corn Indy 250 Practice 2 results

Marco Andretti, Dario Franchitti, Helio Castroneves, Will Power, Ryan Briscoe, James Hinchcliffe, Ryan Hunter-Reay and Scott Dixon posted the eight quickest lap times in the session to qualify for the third 30-lap heat race to crown the pole winner and set the first four rows.

Andretti posted the best lap of 17.2994 seconds (186.041 mph) early in the afternoon session and it stuck as the top. On the other hand, Franchitti jumped to P2 in the final 20 seconds (185.715 mph).

“The goal is to sweep. That’s really what the RC Cola guys deserve and I’m going to try my hardest to give that to them,” said Andretti, who also was quickest in the morning practice session. “It’s been a horrible first half of the season. Like I said, the boys deserve a lot better and I wanted so bad to give them Indy and we fell short. We found a street course car so I’m really pleased about that, so I think for the rest of the season we’ll be good. We’ve got to win this one.”

The top eight were separated by 0.1359 of a second. Rubens Barrichello, bumped by Franchitti's late lap, missed the top eight by 0.0041 of a second.

Barrichello will be in Race 2, consisting of the odd-numbered positions, starting with the ninth-quickest practice time overall, and determine the odd-numbered positions in the starting field from ninth down.

Race 2 lineup:

Rubens Barrichello
Alex Tagliani
Justin Wilson
James Jakes
Charlie Kimball
Simon Pagenaud
Katherine Legge
Simona de Silvestro
Tony Kanaan

Kanaan won't start higher than 19th because of a 10-grid spot penalty imposed for an unapproved engine change on the No. 11 GEICO/Mouser Electronics KV Racing Technology Racing car.

"I won this race starting from 15th," he countered on a positive note.

Race 1 will consist of the even-numbered positions, starting with the 10th-quickest practice time overall, and determine the even-numbered positions in the starting field from 10th down.

Race 1 lineup:

Graham Rahal
Josef Newgarden
E.J. Viso
JR Hildebrand
Oriol Servia
Mike Conway
Ed Carpenter
Takuma Sato

Rahal and Viso also will incur 10-grid spot penalties. Honda made the request to change the engine in Rahal's No. 38 Service Central Chip Ganassi Racing car following the first practice.