"True" Dual exhaust on a chinese 80cc

[Lolokustoms]

I'm looking to make a custom exhaust that splits into two pipes and fits some fishtail tips. Im goin for a custom chopper look Thing is I have no idea if its going to reduce performance or even work at all. I have all the materials and mig so thats no issue..

 

[Ghost0]

A true dual exhaust won't gain you anything since it is a single cylinder engine but it probably won't hurt. If you want to gain performance then you need an tuned pipe (expansion chamber). You can split the exhaust after the expansion chamber to get the look you want and add two mufflers without hurting the performance of the expansion chamber. Hope that helps.

 

[Lolokustoms]

What if I got the attachment to the motor that splits into two tuned pipes then the fishtail tips?

 

[Ghost0]

I suggest you read up on how a tuned pipe works and what it does then you will understand why I provided the advice I did.

 

[Lolokustoms]

Thanks! ;D

 

[cargo-master]

Once upon a time.... I owned a used '70 HD 350 Sprint. It was a single cylinder engine w/ a single header pipe that split "Y" out to two exhausts. One exhaust was missing when I first got it. The end pipe was capped off & it ran fine. When I got the $$ to replace the missing exhaust I do not recall the performance changing. I was young, dumb & content then. 'Cept for the years, seems there's not been much of a change in me.

 

[Ghost0]

Ah but the 350 sprint was a 4 stroke, completely different than with a 2 stroke as far as exhausts go.

 

[Lolokustoms]

What's the main difference tho?

 

[Ghost0]

A 4 stroke has valves so to get performance out of a 4 stroke you want the exhaust to breath so straight pipes are the best, look at a top fuel drag car, if there was performance gain on a 4 stroke by doing anything other than that they would do it. A 2 stroke does not have valves so there are some inherent inefficiencies in the system. An expansion chamber uses the pressure waves coming from the exhaust traveling at a certain speed then being slowed and sped up depending on the shape of the chamber to act as a valve keeping excess fuel and air being expelled out the exhaust before it is burned. The length of the pipe will determine when the pulse reaches back to the exhaust port which is why length is so critical with an expansion chamber. Like I said you could read for days on the subject of 2 stroke expansion chambers. Lots of math and calculating to do it right.

 

[Lolokustoms]

Ohhh okay...cool