Which outcome occurs when exhaust gas recirculation (EGR) is enabled in an internal combustion engine?

💡 Explanation

When EGR is enabled, a portion of the exhaust gas is recirculated back into the intake manifold because this dilution lowers the oxygen concentration and increases the specific heat capacity of the intake charge, reducing peak combustion temperature. Therefore reduced peak combustion temperature results, rather than increased efficiency, elevated NOx, or decreased hydrocarbons which require different combustion conditions.

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