Air intake system of engine

An air intake system for an engine, comprising:

• a blow-by gas flow line configured to be formed on a head cover of an engine to allow blow-by gas introduced into a crankcase of the engine to be discharged from a combustion chamber of the engine, the blow-by gas flow line being configured to allow the blow-by gas to flow into an intake manifold of the engine by recirculating the blow-by gas by utilizing a pressure difference generated if the engine is loaded;
• an intake gas supply line configured to received compressed intake gas from a turbocharger and to supply the compressed intake gas into the combustion chamber and to allow the intake gas to flow therethrough, the intake gas supply line comprising a throttle valve configured to control an intake amount of the intake gas to be supplied to the combustion chamber;
• a new air supply line branched from the intake gas supply line and being connected to the crankcase, the new air supply line being configured to provide new air to pass through an air filter and be supplied to the intake gas supply line and to selectively flow into the crankcase;
• and
• a new air bypass line bypassed on the intake gas supply line and being connected to the new air supply line,
• wherein, if the engine is loaded and the throttle valve is opened, a portion of the compressed intake gas comprising the new air is selectively bypassed due to the pressure difference, and
• wherein the new air bypass line is configured to allow the portion of the compressed intake gas to flow into the crankcase.