Why do 2 stroke dirt bikes have big muffler systems?, and 4 strokes have smaller one?

V

vtwin_doc

New member
2 stroke engines use an exhaust system withwhat is called an EXPANSION CHAMBER, this is the large "muffler" you are referring to. It is not actually a muffler, the muffler on a 2 stroke is referred to as a SILENCER or STINGER which is rather small and attached to the very end of the pipe. The Expansion Chamber is the main engine component that determines the POWEBAND or RPM range in which the engine produces the most power. This is based on the volume, shape, and taper of the Expansion Chamber.
4 stroke pipes MAINLY have tuned length and diameter HEAD PIPES, this length and diameter is tuned in conjunction with the cam profile specs to determine the powerband. Just like the 2 stroke's silencer or stinger, the 4 stroke muffler, to some degree, does not really play a role in the tuning of the engine, it is just a silecing device, however, the larger the volume of the muffler, the more mid-range torque you will get.
 
2 stroke engines use an exhaust system withwhat is called an EXPANSION CHAMBER, this is the large "muffler" you are referring to. It is not actually a muffler, the muffler on a 2 stroke is referred to as a SILENCER or STINGER which is rather small and attached to the very end of the pipe. The Expansion Chamber is the main engine component that determines the POWEBAND or RPM range in which the engine produces the most power. This is based on the volume, shape, and taper of the Expansion Chamber.
4 stroke pipes MAINLY have tuned length and diameter HEAD PIPES, this length and diameter is tuned in conjunction with the cam profile specs to determine the powerband. Just like the 2 stroke's silencer or stinger, the 4 stroke muffler, to some degree, does not really play a role in the tuning of the engine, it is just a silecing device, however, the larger the volume of the muffler, the more mid-range torque you will get.
 
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