Yes, exhaust thermal insulation blanket do work, and they are commonly used to improve the performance, efficiency, and longevity of exhaust systems in various applications, including in vehicles, industrial machinery, and high-performance engines.

Here’s how they work and why they are beneficial:

1. Heat Retention and Containment

• Purpose: Exhaust systems, particularly in high-performance or high-temperature applications, can reach extremely high temperatures. Insulation blankets are designed to contain and retain the heat within the exhaust system, preventing heat loss.
• How it works: The insulation blankets are made of heat-resistant materials (such as fiberglass, basalt, or ceramic) that wrap around exhaust pipes, turbos, and other components. These materials can withstand very high temperatures and act as a barrier, keeping the heat inside the exhaust system instead of letting it radiate outward.

2. Improved Exhaust Flow

• Purpose: By keeping the exhaust gases hotter, thermal insulation helps maintain the gases' velocity and pressure.
• How it works: Hotter gases have lower density and tend to flow faster. By insulating the exhaust system, the gases can maintain higher temperatures and faster flow, which can improve the overall efficiency of the engine or exhaust system, especially in turbocharged or high-performance engines.

3. Protecting Other Components

• Purpose: High exhaust temperatures can damage surrounding components, such as wires, hoses, and sensors.
• How it works: Exhaust thermal insulation blankets protect adjacent parts from heat damage, reducing the risk of thermal degradation of nearby components. For example, in a car, an insulation blanket can help protect sensitive electrical components, wiring, and brake lines from the intense heat generated by the exhaust.

4. Noise Reduction

• Purpose: Exhaust systems can generate a lot of noise due to the turbulence of the gases.
• How it works: The insulation material also acts as a dampener, reducing the sound of the exhaust gases passing through the system. This can lead to a quieter ride, particularly in racing or performance vehicles where exhaust noise can be a concern.

5. Improved Fuel Efficiency and Performance

• Purpose: By keeping the exhaust system hotter, thermal insulation helps with overall engine efficiency and performance.
• How it works: Higher exhaust temperatures can result in better combustion efficiency and reduced turbo lag in turbocharged engines. The engine’s power output can improve because the exhaust gases exit more efficiently, allowing the engine to perform better.

6. Corrosion Prevention

• Purpose: The insulation helps protect the exhaust system from moisture, salts, and other elements that may cause corrosion.
• How it works: Insulating blankets can help prevent condensation from forming on the exhaust pipe, which may help reduce rust and corrosion over time, especially in areas where road salts are commonly used in winter months.

Considerations:

• Durability: Insulation blankets must be properly installed and maintained to ensure they function as intended. Over time, they can degrade or wear out, especially in harsh environments.
• Cost: While insulation blankets can offer performance and protection benefits, they can add to the cost of an exhaust system, especially in custom applications.
• Heat Management: In certain cases, excessive insulation may overheat other components if not used correctly. Careful consideration must be given to the specific application and the components involved.

Common Applications:

• Vehicles: Performance cars, race cars, and motorcycles often use exhaust thermal insulation blankets to improve power and protect surrounding components.
• Industrial Applications: High-temperature industrial machinery and equipment (such as furnaces, boilers, and turbines) also benefit from exhaust insulation.
• Aerospace: Aircraft engines, where high heat and efficiency are critical, may use these blankets to maintain optimal exhaust conditions.

In conclusion, exhaust thermal insulation blankets do work effectively in reducing heat loss, protecting components, improving exhaust flow, and enhancing overall performance.