Why does everyone get 2-1 exhaust?
Tourer
Joined: Jun 2012
Posts: 395
Likes: 0
From: IN
the header merge of a 2:1 does help in scavenging. the 2 pipes of smaller diameter emptying into the larger merge pipe helps to empty the other non-firing exhaust pipe.
http://www.epi-eng.com/piston_engine...technology.htm
If you are going to post like you know something, you'd better be correct.
Outstanding HDF Member
Joined: Apr 2012
Posts: 2,938
Likes: 30
From: North Florida
should be
2:2 system has a crossover pipe one cylinder does not help the other in scavenging like it does in a 2:1 system
Road Master
Joined: Aug 2013
Posts: 1,083
Likes: 157
From: South Central Va
Man there is nothin worse than those Dino-*****, reminds of some bad burritos...
Road Master
Joined: Dec 2012
Posts: 848
Likes: 30
From: CO
One purpose of a exhaust system is to provide a means for the exhaust gases to be removed from the cylinder, preferably quickly and completely. The term for that is scavenging. Back pressure is a term for resistance (obstruction of flow). A cylinder with residual exhaust gases has less room available to accommodate the incoming charge of gas and oxygen. Obviously, the more gas and oxygen you can get into a cylinder the more power you will achieve. Scavenging not only helps empty the cylinder, it also helps drawing in the new charge by producing a negative pressure. Unless a 2:1 system has a crossover pipe one cylinder does not help the other in scavenging like it does in a 2:2 system.
This is very basic, there are a lot of other factors that come into play (valve timing, rpm, wave length, pipe length, diameter etc...)
This is very basic, there are a lot of other factors that come into play (valve timing, rpm, wave length, pipe length, diameter etc...)
You got the 2-1 and 2-2 reversed. The whole reason 2-1 pipes allow for so much torque is that they are the best for scavenging. 2-2 pipes need the crossover to basically mimic what 2-1 pipes do.
The reason for 2-1 is maximum power potential. Period.
Road Warrior
Joined: May 2009
Posts: 1,760
Likes: 211
From: Manila, Philippines
I am running 2-1 Bassani Road Rage. I think its a bit too quiet. If I remove the baffles, will it affect the scavenging effect then? Or should I go with some other type baffles from BCT for better sound but same or better performance?
Am running a 107 ci w/TW555 cams on a 2008 FXDC.
Am running a 107 ci w/TW555 cams on a 2008 FXDC.
Tourer
Joined: Jun 2012
Posts: 395
Likes: 0
From: IN
I am running 2-1 Bassani Road Rage. I think its a bit too quiet. If I remove the baffles, will it affect the scavenging effect then? Or should I go with some other type baffles from BCT for better sound but same or better performance?
Am running a 107 ci w/TW555 cams on a 2008 FXDC.
Am running a 107 ci w/TW555 cams on a 2008 FXDC.
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Road Warrior
Joined: Mar 2009
Posts: 1,837
Likes: 46
From: Macomb MI
I am running 2-1 Bassani Road Rage. I think its a bit too quiet. If I remove the baffles, will it affect the scavenging effect then? Or should I go with some other type baffles from BCT for better sound but same or better performance?
Am running a 107 ci w/TW555 cams on a 2008 FXDC.
Am running a 107 ci w/TW555 cams on a 2008 FXDC.