Exhaust upgrade????

[Kleyny]

When I purchased my go kart I was given a upgraded exhaust.
After seeing the exhaust port size on the clone V the header size on the "upgraded" exhaust I think it is a step back wards.
I purchased some 3/4 pipe to build a new header.
The question is how long do I have to make it to keep it quite but still have good flow?

Thanks
Neil

 

[bob58o]

The exhaust is not a step backwards. Have you seen stock exhausts?

I had a similar exhaust and didn't like the stepped reduction.

I added some material with my welder and then ground it to a taper.
Not sure if it did anything except make me feel better.

Lets see if I can find a pic.
Welded, Ground, Gasket Matched.

 

[bob58o]

Nothing shorter than 5 or 6 inches.
Add a conduit/ pipe Coupler and keep the muffler in the picture if you want the sound muffled.

 

[Kleyny]

Thanks Bob58o.
It could be just the photo but your hole looks bigger than mine. Wow that sounds bad lol.
The header hole of mine is a bit over 1/2".

That muffler end fits inside the 3/4 pipe I got so it won't be to hard to weld them together.
I might run it baffle free forva while to see how noisy it is.

Thanks
Neil

 

[Whitetrashrocker]

I used 1" pipe. About a foot long. Made a flange and welded it up.

https://youtube.com/watch?v=QM0DgVw_I2A

 

[Kleyny]

Thanks Whitetrashrocker.
Hard to tell on my phone how much noisier do you think it is from stock?

Thanks
Neil

 

[Whitetrashrocker]

It's a bit louder. But it's a good kind of loud.
After I put that pipe on I just butted some more pipe to the end to see how much tone change there was. The longer the pipe the deeper the tone. I guess those torque tube with the several coils would sound pretty deep. I just made a random length.

If you look in my build thread " tale of two Dingos" there are a couple of vids I posted. One is a longer vid of me doing a few laps. I had the stock exhaust on then. I made a short vid a few post later with the short pipe.
It won't be a great comparison but you should be able to get an idea.

 

[tinamcjittles]

Yeah go with 1" but be careful because the welds can interfere with the nuts that hold it to the engine.. 6" is the minimum length usually; anything longer makes it deeper (resonates more) and a little quieter since the gases have time to expand and slow down before deafening your neighbors

 

[chancer]

Good advice. I used 1" ID pipe and I had to Grind a little spot for the nuts and they still fight me a little.

 

[Flyinhillbilly]

What you have is known as a weenie pipe. They were used in racing to try and level the field.

 

[Kleyny]

Thanks guys.
I already have some 3/4 pipe so I'll be using that. I'm not much of a welder so it probably wise I stick with the smaller diameter lol.

Thanks
Neil