Which phenomenon reduces efficiency when an Internal Combustion Engine runs lean?

💡 Explanation

Lean mixtures decelerate flame propagation because the reduced fuel limits the **radical chain branching** steps in combustion; therefore, unburned fuel results, rather than efficient expansion, because the flame quenches prematurely near the cylinder walls.

• Which mechanism causes higher reactive power in lightly loaded transmission lines?
• Which consequence results when increased path length difference degrades laser coherence?
• Which effect occurs when extremely high-density collapses spacetime?
• Which outcome occurs when electrons experience lattice vibrations?
• Which consequence results when a microscopic channel's Reynolds number increases?
• Which outcome occurs under extreme gravitational intensity regarding spacetime?