Aerodynamics
Cooling

What’s a Pop-Off Valve — and Why You Need to Know for the Daytona 500

One thing you will hear a lot as soon as coverage of practice starts Wednesday will be speculation about possible changes to the pop-off valve on the radiator. What is a pop-off valve and how will it affect the Daytona 500? Here’s the answer: […]

Electronic Fuel Injection

How close is NASCAR EFI to “Real” EFI?

As we turn on the (new) engines to start the season, the twitterverse is getting even more full of people debating the NASCAR EFI system. Is it like the EFI in production cars? Is it throttle body? Is it multiport? Here are the answers: […]

Electronic Fuel Injection