|Honda IndyCar engine|
In IndyCar, engine manufacturers have to comply with a strict set of rules that define displacement, cylinder count, and boost levels. Currently, the only engine configuration allowed is a twin-turbocharged 2.2-liter V-6. Here's how teams are able to squeeze more than 700 horsepower from such a small motor.
As Jason Fenske of Engineering Explained shows in his latest video, it comes down to two main factors. The first is RPM. IndyCar engines can rev all the way to 12,000 RPM—far higher than your average road car engine. That means more power strokes per minute, without valve float or knock.