Scavenging
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Writer:Admin
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Scavenging, in an engine, is the process of replacing the engine's internal exhaust gases with a mixture of fresh air and fuel for the next combustion cycle. This effect is of great importance in 2-stroke and 4-stroke internal combustion engines. If it is inefficient, all the combustion gases are not evacuated from the cylinder and the expansion operation in the cylinder will not be complete, and thus the engine efficiency will be reduced.
Scavenging has different types. For four-stroke engines, a blower sweeping effect is usually required. Now it can be provided by turbochargers or by using headers and fluid calculations related to the flow inside the pipe to force the combustion gases to leave the cylinder.
One of the important components to increase the scavenging effect is to reduce the resistance to the passing air flow. Air flow resistance increases the pressure on the outlet ports and ultimately reduces the engine efficiency. Engine Arts' headers, made of steel, with a polished inner surface, help to greatly reduce air resistance and prevent pressure buildup in the exhaust pipe. On the other hand, with each working cycle inside the cylinder, an exhaust pressure pulse is created. The pressure waves resulting from engine operation, if directed correctly, can reduce pressure buildup in the exhaust. Because along the exhaust path of the airflow, the pressure waves collide with the pipe walls and reflect.
Scavenging has different types. For four-stroke engines, a blower sweeping effect is usually required. Now it can be provided by turbochargers or by using headers and fluid calculations related to the flow inside the pipe to force the combustion gases to leave the cylinder.
One of the important components to increase the scavenging effect is to reduce the resistance to the passing air flow. Air flow resistance increases the pressure on the outlet ports and ultimately reduces the engine efficiency. Engine Arts' headers, made of steel, with a polished inner surface, help to greatly reduce air resistance and prevent pressure buildup in the exhaust pipe. On the other hand, with each working cycle inside the cylinder, an exhaust pressure pulse is created. The pressure waves resulting from engine operation, if directed correctly, can reduce pressure buildup in the exhaust. Because along the exhaust path of the airflow, the pressure waves collide with the pipe walls and reflect.
