Topic: Exhaust Question

[I Zombie]

I was thinking of making a custom exhaust out of my 4-2's. Any advantages to running a balance pipe between the 2 sides?  Would it act more like 4-1?
Any thoughs are welcome.

[Cqyqte]

I took my 4-2-1's and modified them to be a 4-1.  In order to make them work I had to add 3" to the down protion of the number 1 primary.  By doing so the four primary's swung up nicely under the rightside frame rail.  I bought a four pipe collector from http://www.spdexhaust.com/CollectorsB.html FC4138-17518C
which allowed the original rear pipe to be slipped over the collector as in the OEM setup.

[I Zombie]

I wanna keep the 4-2, but I'm wondering if a balance pipe would help any.  Tuning or performance wise?

[Cqyqte]

Where would you be placing the balance pipe?

[I Zombie]

Probably under the swingarm pivot or closer to the front of the bike if I lose the centerstand.

[Cqyqte]

The fact that the balance pipe would be running at 90 degrees to the exhaust flow and at least 10" long I would believe any benefits would be reduced.  I have read that a crisscross-over or X pipe provide more benefits as the flows are less disrupted as they are straighter. 

[I Zombie]

I can see the X pipe takin up a lot of room

[cb750k77]

YUP it sure does makes it really hard to change the oil as well!!!

what your refering too is a "H" pipe like on a "stang" the sotra work but the benefit is not as much as a 4-2-1 would be just get Cycle X's pipe and call it a day his pipe looks good its cheep and its already made just a bolt on afair dont try and reinvent the wheel? right?

[I Zombie]

Oh I'm not trying to reinvent anything. Just have apic in my head for a different style exhaust. can't really affor the Cycle X ehaust, but it would be nice. Thank for all your opinions, hopefully i can execute it the way I have it in my head.

[steam-powered man]

my r75/6 had a balance pipe at 90 degrees to flow, at least 10inches long and very close to the front of the bike.  find a front-view pic of a 1976 bmw r75/6, you'll find it.  somebody, somewhere reckoned there was an advantage.

edit:  i just googled "motorcycle balance tube" - plenty of good reading, they seem to have a positive effect on v-twin and boxer performance.

[I Zombie]

I know that  harley uses em & muscle systems do too. Just not sure what id any advantage it would have on a Honda 750