View Single Post
Old 08-14-2009, 06:02 AM
Ghost0's Avatar
Ghost0 Ghost0 is offline
Motorized Bicycle Elite Member
Join Date: Mar 2008
Location: Bellingham, WA
Posts: 764
Default Re: Calling all SBP Pipe users

If you want the power band at a lower rpm you want the pipe longer not shorter. The longer the pipe is the longer it takes for the pressure waves to travel through the pipe which equates to better timing at low rpm and more power at lower rpm's. With a shorter pipe the pressure waves take less time to travel the distance of the pipe which is timed better for higher rpm's and therefore produces more power in the higher rpm range.

For a single speed I think a 36 is pretty tall and your bike will not have much low end torque anyway. Now that you have shortened the pipe it has also reduced your low end torque. Maybe try a 40 which may keep your engine in a more suitable rpm range for your current set up.
Design is easy, execution the hard part.
Reply With Quote