Justgotabanshee Posted January 20, 2011 Report Share Posted January 20, 2011 my cousins hmf sport series pipe on his yfz450r a littel humpf haha nothing huge...why is aftermarket exhaust always a big deal for banshees Quote Link to comment Share on other sites More sharing options...
dirtydownunder Posted January 20, 2011 Report Share Posted January 20, 2011 hey, the exhaust on any two stroke plays are major part in how that engine works. its not like a 4 stroke. the ports and exhaust on a 2 stroke is like the cams/valve timing on a 4 stroke. When you change the pipes on a 2 banger, its changes how that engine runs. expect great gains, from stock exhaust to a after market one. Quote Link to comment Share on other sites More sharing options...
gotta_goatsfast Posted January 20, 2011 Report Share Posted January 20, 2011 Do some research on how a two stroke engine works. (try howstuffworks.com) or youtube possibly. Anyway, when the piston uncovers the exhaust port, obviously the exhaust gases flow out. But, when the piston reveals the transfer ports, all that fresh air and fuel rush into the cylinder. Since the exhaust port is still exposed, some of that fresh air/fuel escapes out of the exhaust. The pipe is tuned so that it forces the fresh stuff back through the exhaust port into the cylinder as the piston closes and seals the cylinder. When your banshee gets into its "powerband" this plays a big role as the fresh air and fuel are now being forced back into the cylinder, burning, and being converted into mechanical energy instead of being blown out of the exhaust. A 2 stroke pipe can be tailored to reflect the air/fuel back into the pipe at different ranges of rpm. Low-mid pipes do this at, well, low to mid rpm. Top end pipes are tuned to reflect air/fuel back into the chamber at higher speeds. Some pipes work better than others in specific areas (Pro-circuits do a better job at low-mid than Bills pipes, CPIs hit just as soon as T5s but pull harder/longer) Quote Link to comment Share on other sites More sharing options...
Coupelx Posted January 20, 2011 Report Share Posted January 20, 2011 http://lmgtfy.com/?q=2+stroke+theory Quote Link to comment Share on other sites More sharing options...
06specialedition Posted January 20, 2011 Report Share Posted January 20, 2011 A bone stock banshee....to just a piped and filtered banshee is a big difference. Quote Link to comment Share on other sites More sharing options...
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