An exhaust system is a system of pipes and piping that expel exhaust gases from an engine. It can be tuned to improve engine performance. A tuned exhaust system generally consists of a modified expansion chamber, which produces a negative pressure wave that reduces the volume of air that enters the combustion chamber and exits through the exhaust port.
In internal combustion engines, the geometry of the exhaust system can be optimized to increase power output. This is done by designing the exhaust system so that the reflected pressure waves arrive at the exhaust port at a specific time during the combustion process. A typical motor scooter exhaust system contains an expansion chamber in the middle section. Tuning the exhaust system will improve engine performance and fuel economy.
The size and diameter of the exhaust pipe is an important factor when choosing a performance exhaust system. The diameter of the pipe will affect the temperature of the exhaust. Longer pipes lose heat more efficiently than short ones and will therefore result in a higher exhaust pipe temperature. This is because larger diameter exhaust pipes have more resistance to heat and have a larger mass.
There are many types of headers for different applications. Some are used in conjunction with the exhaust manifold, but the two are not the same. The main difference is the size and shape. A stock production header is generally made of cast iron, while a performance header is made of stainless steel. A stock production header will have a number of material-saving features, but these will reduce the effectiveness of the system.
The exhaust throttle valve is another key component for maximizing engine performance. It creates a short increase in back pressure in the exhaust system. The ECU controls the throttle valve and the other components of the exhaust system to optimize pumping and boost low-end torque. In addition, the ECU constantly adjusts the back pressure of the exhaust system in order to optimize pressure wave formation. While back pressure is necessary for the motor to run, too much back pressure will prevent the cylinders from scavenging fuel.
The diameter of the pipes is another important factor for exhaust efficiency. A larger diameter exhaust pipe will improve low-range power while a smaller one will limit high-end power. The length of a pipe is also important. A long pipe will increase power in the mid-range and lower ranges, while a short one will increase power in the high-range.
Exhaust gas behavior is affected by other components of the engine, including the carburetor and air intake. Understanding how these components interact will give you a better understanding of how a car’s exhaust system works. A properly-designed exhaust system will increase volumetric efficiency and reduce pumping losses, which will increase power.