수리 사례

2026. 6. 30. 작업

증상

Why do we need to cool air after it leaves a turbocharger?

처리 내용

tl;dr To combat detonation (in SI engines) To increase power/efficiency Details There are a few important factors at play here. Engine detonation is a real concern for SI engines A spark-ignition engine is more likely to experience premature ignition (aka knocking or detonation) with hotter air. In fact, the calculations in the example below can show that this is the primary reason why intercooling is such a Good Idea. Hot air rises, cold air sinks In physics-speak, hot air is less dense than cold air. This means that the volume occupied by 1 kg of hot air is greater than the volume occupied by 1 kg of cold air. The internal combustion engine is a volumetric device What this implies is that every time the engine turns over and completes a cycle, the volume of air that is admitted into the combustion chamber(s) is fixed. Power depends on mass, not volume The power developed by the engine is proportional to the mass of air admitted into the combustion chamber and not its volume. More air