ENGINE:

The IRL regulations call for a normally aspirated, fuel-injected, aluminum alloy cylinder block V8 engine. The dispacement is 3.5 liters (213.6 cubic inches). Although the series is open to any manufacturer who is willing to produce such a powerplant, Honda is currently the sole engine manufacturer.

TRANSMISSION:

XTRAC #295 six-speed, no reverse, sequential shifter.

FUEL:

As of the 2007 season, the Indy Racing League has used 100% fuel-grade enthanol for fuel. There were no fuel-related engine failures during the past season.

TIRES:

Firestone is the sole tire supplyer to the Indy Racing League. The tires are "racing slicks" that are 3/32nds of an inch in thickness. 

The front tires are 10 inches wide and 26 inches in diameter and weigh 18 pounds.

The rear tires are 14.5 inches wide and 27 inches in diameter and weigh 22 pounds.

CHASSIS:

There are two chassis currently available to the teams for use, the Dallara and the Panoz. As of last year, the Panoz chassis was clearly out of favor and only saw use by a few of the "one-off" teams that competed in the Indy 500.    

                                                   Dallara

                                                    Panoz

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