If the waste gate of a turbo-charged engine seizes during the climb, what will happen to the manifold pressure?

If the waste gate of a turbo-charged engine seizes during the climb, what will happen to the manifold pressure?

• A. Remain constant
• B. Decrease
• C. Increase
• D. Initially increase and then decrease

Answer: (B)

In a turbocharged engine, the wastegate is a critical component that controls the flow of exhaust gases to the turbine. Its primary function is to regulate the amount of boost pressure generated by the turbocharger. When the wastegate seizes, it cannot open as intended. This means that too much exhaust gas flows to the turbine, causing the turbocharger to spin excessively fast and increasing the boost pressure beyond normal operational limits. As a result, the manifold pressure would not remain constant or decrease; instead, it would increase initially due to the excessive boost from the turbocharger trying to compensate for the inability to control airflow through the wastegate. However, if the situation continues, and components start to reach their operational limits, safety mechanisms or engine protections could come into play, which might ultimately lead to a drop in manifold pressure after reaching a peak. Thus, while the immediate consequence of a seized wastegate is an increase in manifold pressure, further effects could lead to eventual declines due to overboost conditions causing engine management interventions or failure. Ultimately, the most immediate and straightforward result of a seized wastegate would be an increase in manifold pressure, making this the correct interpretation of the scenario.

In a turbocharged engine, the wastegate is a critical component that controls the flow of exhaust gases to the turbine. Its primary function is to regulate the amount of boost pressure generated by the turbocharger.

When the wastegate seizes, it cannot open as intended. This means that too much exhaust gas flows to the turbine, causing the turbocharger to spin excessively fast and increasing the boost pressure beyond normal operational limits. As a result, the manifold pressure would not remain constant or decrease; instead, it would increase initially due to the excessive boost from the turbocharger trying to compensate for the inability to control airflow through the wastegate.

However, if the situation continues, and components start to reach their operational limits, safety mechanisms or engine protections could come into play, which might ultimately lead to a drop in manifold pressure after reaching a peak. Thus, while the immediate consequence of a seized wastegate is an increase in manifold pressure, further effects could lead to eventual declines due to overboost conditions causing engine management interventions or failure.

Ultimately, the most immediate and straightforward result of a seized wastegate would be an increase in manifold pressure, making this the correct interpretation of the scenario.