Another exaust thread with ?

[Scorpio1963]

I would just like to see and hear a bike that has the two crossover pipes but Im probaly thinking it will never happen cause they are so rare.Who knows if I can find another crossover maybe I`ll make one.

 

[lcgtr]

Can anyone send me a link to exhaust system design theory?
My searches have turned out nothing helpfull. Im sure there are some rules of thumb.

Guys swear this is optimal for a racing XS650/750 so I was thinking of scaling it down by 40%

 

[drewpy]

try this site

http://www.mez.co.uk/mezporting/exhaust_length.html


its always a compromise

 

[lcgtr]

cool thanks mate

Heres the calc for my bike with 4th oversize pistons

 

[lcgtr]

wish I knew more about the collector... inside diameter?
collect in primary pipe tubing or tailpipe tubing??

 

[drewpy]

collector would be the joint between the down pipe and tail pipe.

I assume it is the Y piece so it feeds from 2 into the tail pipe, size is already determined

 

[lcgtr]

but how do I make that joint 4.8 inches?

 

[drewpy]

use a saw

 

[lcgtr]

haha, smart ass (but better than a dumb ass I always say)

 

[drewpy]

I thinks its saying the distance where the downtubes join to where the actual single pipe starts would be the distance.

the Motad ones are just like a Y piece about that length!