What is the purpose of an augmentor on a reciprocating engine exhaust system?

• A. To produce a venturi effect to draw increased airflow over the engine for cooling.
• B. To increase exhaust gas temperature.
• C. To reverse the exhaust.
• D. To disable the muffler.

Answer: (A)

An augmentor on a reciprocating engine exhaust system is designed to pull more cooling air through the engine by using a venturi-like effect. As exhaust gas is funneled through a restricted passage, its velocity increases and the pressure around the exhaust area drops. This low-pressure region entrains and draws additional ambient air through the cowling and over the cylinders, increasing the rate of cooling. This helps maintain engine temperatures during high power or hot-weather operation. It is not intended to raise exhaust temperature, reverse the exhaust flow, or disable the muffler.