Brief description
The desire to achieve the lowest possible burden on the environment renders necessary a high degree of intricate design and tuning work. This always represents a compromise between high engine output and low exhaust emissions such as nitrogen oxide emissions.
The entire air intake and exhaust system has been revised for the M57/M67 in order to comply with the more stringent requirements with regard to pollutant concentrations in exhaust gas.
Requirements and objectives
The following requirements and objectives apply to the air intake and exhaust system:
• Requirements
– Compliance with EU exhaust emission legislation
– Optimum torque and power utilisation
– Reduction in fuel consumption
• Objectives
– Improvement in noise comfort
– Traction capacity in lower engine speed range
System structure
The air intake and exhaust system consists of the following components:
• Unfiltered air intake
• Intake silencer
• Exhaust turbocharger
• Intercooler
• Intake manifold (intake plenum)
• Exhaust manifold
• Exhaust gas recirculation (EGR)
• Exhaust system
