Mufflers

Function

• Reduce sound.
• Direct and spread exhaust gases.
• Clean exhaust gases (applies especially to mufflers equipped with catalyst).
• Control backpressure to optimize engine performance and emissions.

Technical requirements

• Very tough demands on the ability to withstand high temperature (up to 800°C), fatigue, shocks and bumps since the application is subjected to very high vibrations, hot exhaust gases and is often placed in an exposed position.
• Demands for anticorrosive treatment.
• Withhold law requirements regarding exhaust temperature and sparks.

Dimension, Weight and Material

• Metal strip, thickness 0.5-1.5mm. Most often draw quality with or without a coated aluminized layer, or stainless steel.
• Solder paste, rings and sheets (for brazed mufflers only): copper and/or copper/tin.
• Catalyst as plate, wire mesh or honeycomb.
• Volume from »150-950ml.

Production process

• Deep drawing (often complicated geometries and/or draw depth) or progressive tools.
• Brazing or crimping into complete units (often delivered with a spark arrester).
• High demands for good fit between components (applies especially for brazed mufflers).
• Spot welding and welding.
• With or without backpressure control.
• Anti corrosive treatment/surface treatment with black oxidation, plastisols or paint.