The IRL IndyCar Series is downsizing its engine formula from the current Honda-made 3.5L V8 to four and six cylinder engines displacing a maximum of 2.4L, a move being considered by other forms of motorsports, including Formula 1.
While F1 and NASCAR have different engine builders competing against one another, the engines are generally similar in their output and design. The new IndyCar format should allow for more variety and more interesting race strategy. Formula 1 famously allowed four and six cylinder engines in the 1980’s, an era regarded as some of the most thrilling racing of all time.
IndyCar will also continue to use ethanol for its race fuel.
[Source: Inside Line]