The thick gauze or fabric wrapped around the exhaust header pipes or down tubes of motorcycles is often referred to as exhaust wrap or header wrap. It is a heat-resistant material typically made from fiberglass, titanium, or a similar material.
The purpose of using exhaust wrap is primarily to manage and control the heat generated by the exhaust system. Here are some reasons why motorcycle owners may choose to wrap their exhaust headers:
Heat insulation: The exhaust gases produced by the engine can reach extremely high temperatures. By wrapping the exhaust headers with heat-resistant material, the heat is contained within the exhaust system, reducing the amount of heat radiating outward. This can help protect nearby components, such as wiring, hoses, and fairings, from excessive heat damage.
Performance benefits: Some motorcyclists believe that exhaust wrap can enhance performance by keeping the exhaust gases at a higher temperature. This can result in improved exhaust scavenging, which helps evacuate exhaust gases more efficiently, potentially increasing horsepower or torque output. However, the actual performance gains from exhaust wrapping alone may be minimal.
Aesthetics: The visual appearance of exhaust wrap can be appealing to some riders. It can give the motorcycle a custom or vintage look, and it is often seen on café racers, bobbers, or bikes with a particular aesthetic theme.
It's worth noting that while exhaust wrap can offer benefits, it also has some considerations to keep in mind:
Maintenance: Over time, the wrap can deteriorate and become brittle due to exposure to heat, moisture, and road debris. Regular inspection and maintenance are important to ensure the wrap remains in good condition.
Heat retention: While exhaust wrap helps contain heat within the exhaust system, it can increase the temperature of the headers themselves. This can potentially lead to accelerated corrosion or premature wear of the headers.
Installation and compatibility: Proper installation of the exhaust wrap is crucial to ensure it is secure and won't unravel during riding. Additionally, not all motorcycles are suitable for exhaust wrap, especially those with certain types of exhaust coatings or heat shields. It's recommended to consult the motorcycle manufacturer or a knowledgeable professional to ensure compatibility and proper installation.
Overall, the use of exhaust wrap is a personal preference, and riders should consider the potential benefits and drawbacks before deciding to wrap their motorcycle's exhaust headers.