Dual exhaust

[3imo]

...you may be a student, but I've been building these things for a decade.

OWNED!!!  

Poor dude.  that was his second post. 

suck it up man, don't be discouraged.

[3imo]

hey MAK - could you help me with this?  http://gstwins.com/gsboard/index.php?topic=25596.0

[Blueknyt]

Where's Geep? he should be in on this.

So a "good' 2 to 1 tuned system will outflow a 2 to 2 system.

2 open pipes Vs 2 pipes into a collector that is left open of same overall length will flow the same Volume of air aslong as the Diameter leaving the ports arent restricted.  in laymens terms the collector design (if proper) will  create a small vacume to help clear the Combustion chamber during overlap (the time where the exh valve and intake valve are still partialy open the same time) this is the scavenging effect.   Keep in mind over all length of BOTH systems will play a fair part in scavaging.  however, as short as bike exhausts are, 2-1 or 2-2 wont differ on flow but they can reshape the engine's powerband to make more power at different points.

now here is something to chew one,  2 pipes leading out and ending my not be ideal in some applications, BUT a header could in somecases Hurt performance if not ballenced with other parts.  here is a cut an paste i found

The diameter and length of the header tube are critical. For a given engine displacement, a smaller tube will cause the exhaust pulses to flow faster down the tube, thus increasing the momentum and the scavenging effect. Too small a tube and back pressure increases. Long header tubes provide superior low RPM performance while shorter tubes work best at high RPM. Optimal tube length and diameter depends on displacement and the desired RPM for the power band. Hence big race engines - big tubes, small street engines - small tubes.

Bonus information for reading to the end - intake runners have a similar tuning effect! Engine components need to be balanced - exhaust, cam, intake, RPM range and displacement all have to work together.

[makenzie71]

3imo...cutting the can would be fine, but you'll likely have to have it professionally done (the can is likely stainless steel).  I don't think modifying the can is going to really help, though...they're a bit too big.

What I would suggest is picking up a couple of sarachu slip-ons made for the EX500 and having them cut down to about 18".  They're dinky cans that you can mount on either side and they'll snug up pretty well.

[sledge]

I found this site more or less by accident. Its not really my field but I am sure it will answer some questions and maybe even settle some arguements. BTW is that the correct way to spell "Hydrolic"?? Its spelt "Hydraulic" in my corner of the world 

http://www.headerdesign.com/

[Jim Knopf]

servus,

i have made this dual exhaust with shark track pipes, for my bike 4 years ago:


2004, i have Kawa Z1000 pipe on my bike:


great sound!

2005, i have this short laser pipes on each side:


and a great sound too!

for the saison 2006 i have new one!