Which component directs the bouncing air back to the intake valve?

Which component directs the bouncing air back to the intake valve?

• A. Runner
• B. Plenum
• C. Throttle body
• D. Manifold

Answer: (A)

Airflow in an intake system isn’t just about moving air in; it’s also about using reflected pressure waves to help fill the cylinder at the right moments. The path that carries those bounced waves back toward the intake valve is the runner. Each runner connects from the plenum to an individual cylinder port, and its length is tuned so the reflected wave arrives as the valve is opening, boosting air filling at target engine speeds. The plenum mainly stores and evenly distributes air, the throttle body controls how much air can enter, and the manifold is the overall assembly that includes both plenum and runners. But when it comes to directing the bouncing air back to the valve, the runner is the component responsible.

Airflow in an intake system isn’t just about moving air in; it’s also about using reflected pressure waves to help fill the cylinder at the right moments. The path that carries those bounced waves back toward the intake valve is the runner. Each runner connects from the plenum to an individual cylinder port, and its length is tuned so the reflected wave arrives as the valve is opening, boosting air filling at target engine speeds. The plenum mainly stores and evenly distributes air, the throttle body controls how much air can enter, and the manifold is the overall assembly that includes both plenum and runners. But when it comes to directing the bouncing air back to the valve, the runner is the component responsible.