06-28-2006
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#11 (permalink)
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Senior Member
World SuperBike Favorite Bike: '06 Bonneville Black
Join Date: May 2006
Location: Hanover PA
Posts: 1,871 Other Motorcycle: '89 FXR
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Quote:
On 2006-06-28 08:59, sweatmachine wrote:
Those numbers are suspect at best.
The device you're talking about, torque tubes/cones/backpressure cones, etc is to give the proper amount of back pressure in really short pipes.
You know those short pipes on the TV shows, that are really loud? There's no way they make enough back pressure for those engines to run correctly, so they machine these little cones that drop in the header pipe at the exhaust port.
They restrict the flow enough to act like the pipes are longer, making it possible to run short pipes and still have adequate backpressure.
It's not really a performance mod, it's more like a rig-job to fix the pipes that really don't work right.
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Intresting explanation...thank you.
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