Which outcome occurs when exhaust backpressure increases excessively in four-stroke combustion cycle engines?

💡 Explanation

When exhaust backpressure increases, residual exhaust gas is trapped in the cylinder because of reduced pressure differential, decreasing the space for fresh air-fuel mixture, which reduces volumetric efficiency. Therefore, volumetric efficiency decreases, rather than increasing combustion completion, decreased valve temperature, or increased engine speed which would require improved gas exchange.

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