Bifurcated air induction system for turbocharged engines

An air induction system for an internal combustion engine, the system comprising:

• a turbocharger having a compressor side inlet;
• a clean air box;
• and
• a bifurcated clean air intake system having a bifurcated conduit fluidly coupled between the turbocharger and the clean air box and comprising:
• an upstream end configured to receive intake air from the clean air box;
• a downstream end configured to supply intake air to the compressor side inlet;
• an inner passage configured to supply intake air to the downstream end;
• an outer passage disposed about the inner passage and separated from the inner passage by an inner wall, the outer passage configured to selectively receive recirculation backflow from the compressor side inlet;
• and
• wherein the outer passage is fluidly coupled to the clean air box and configured to selectively provide at least a portion of the recirculation backflow to the clean air box for mixing with the intake air.

An air induction system for an internal combustion engine, the system comprising:

• a turbocharger having a compressor side inlet;
• a clean air box;
• and
• a bifurcated clean air intake system having a conduit fluidly coupled between the turbocharger and the clean air box and comprising:
• an upstream end configured to receive intake air from the clean air box;
• a downstream end configured to supply intake air to the compressor side inlet;
• an inner passage configured to supply intake air to the downstream end;
• an outer passage disposed about the inner passage and separated from the inner passage by an inner wall, the outer passage configured to selectively receive recirculation backflow from the compressor side inlet;
• a port fluidly coupled between the outer passage and at least one of a crankcase and a valve cover of the engine, wherein the port is configured to selectively provide at least a portion of the recirculation backflow to the crankcase and/or the valve cover;
• and
• wherein the outer passage is fluidly coupled to the clean air box and configured to selectively provide at least a portion of the recirculation backflow to the clean air box for mixing with the intake air.