Which is Better 2-1 or 2-2 or Slip On Mufflers?
Thread Starter
|
Banned
Joined: May 2005
Posts: 14,496
Likes: 156
From:
Which is Better 2-1 or 2-2 or Slip On Mufflers?
A properly designed 2-1 motorcycle exhaust will produce substantially more power than a 2-2 system.
A 2-1 system performs as a "header" system with a "collector". If you look at a drag racing car like a Pro stock or a NASCAR Winston cup car you will notice that the motorcycle exhaust system are routed together into a common larger tube called the collector. Each of these tubes are the same length which is determined by the type of engine. The diameter of the tube is optimized for flow and proper back pressure. As exhaust flow enters the collector, the pulses create a scavenging effect, creating a slight pressure drop which helps extract the following exhaust pulse.
The benefit from this is reduced back pressure and reversion. Reversion is a phenomenon where sound waves travel back up the outside wall of the motorcycle exhaust pipe and during the point where both the intake and exhaust valves are both open (overlap phase), the reverse "pulse" can reverse flow in the intake tract. This reversion reduces the intake charge lessening the power produced.
Where do you get the most gains? Typically in the midrange and top end. Off idle is improved but not as dramatically.
Models like the FLH motorcycle series with dual exhausts are a compromise of form over function. The system looks good but that left hand motorcycle exhaust can actually hurt performance as it can increase reversion.
So, if you want to get the most improvement, I recommend a good 2-1 motorcycle exhaust pipe systems over both 2-2 and slip on mufflers.
Source" http://www.directparts.com
Thread
Thread Starter
Forum
Replies
Last Post
Biker Trash
Sportster Models
14
Feb 8, 2008 11:48 PM
