The thick gauze wrapped around the exhaust header pipes or down tubes of motorcycles is commonly known as "exhaust wrap" or "header wrap." It is a heat-resistant material typically made of fiberglass, titanium, or other insulating materials. The primary purpose of exhaust wrap is to manage and control the heat generated by the exhaust system. Here are a few reasons why riders may choose to wrap their exhaust pipes:
Heat management: Exhaust wrap helps to reduce the amount of heat radiating from the exhaust pipes. By insulating the headers, it prevents the heat from transferring to surrounding components, such as the engine, oil lines, wiring, and other sensitive parts. This can help lower the overall temperature of the engine compartment and improve performance in some cases.
Performance benefits: Some riders believe that exhaust wrap can enhance performance by maintaining higher exhaust gas temperatures. This can promote better exhaust gas flow and scavenging, potentially improving engine efficiency and horsepower output. However, the actual impact on performance can vary depending on the specific bike and modifications.
Aesthetics and customization: Exhaust wrap is also used for cosmetic purposes, as it can give a distinctive look to a motorcycle. The wrapped pipes can create a vintage or race-inspired appearance, and some riders prefer this visual effect on their bikes.
It's worth noting that there are some considerations to keep in mind when using exhaust wrap. While it can offer benefits, it may also have potential drawbacks. The increased insulation can trap heat and potentially lead to higher temperatures in certain areas. It can also accelerate corrosion of the pipes if moisture becomes trapped beneath the wrap. Additionally, the increased insulation may affect the tuning and performance of the bike's exhaust system, requiring adjustments to the fuel-air mixture or other modifications.
If you are considering using exhaust wrap on your motorcycle, it's advisable to research and understand the specific implications for your bike's make and model. Consulting with experienced mechanics or riders who have used exhaust wrap can provide valuable insights and help you make an informed decision.