As shown in figure 8.1, cardiorespiratory endurance requires fitness of your heart, lungs, blood, blood vessels, and muscles. In this lesson, youâll learn how proper physical activity improves your cardiorespiratory endurance. Youâll also learn how to assess your cardiorespiratory endurance.
Exhaust gas recirculation (EGR) is a system that takes exhaust gas from a dieselâs exhaust manifold and reintroduces it into the intake of the engine to reduce the combustion chamber temperature.
The EGR vacuum modulator is a component found on some EGR systems. It controls the flow of the EGR system by using a vacuum operated diaphragm to increase or decrease EGR flow. When the vacuum is high, combustion temperatures and airflow are naturally lower so the diaphragm will close and restrict flow, when vacuum is low airflow and combustion temperatures are higher, so EGR flow must be increased.