Resonator/hot Dog Muffler

[rian]

Hey RC,

 

I'm about to make an exhaust for my KE70, but I'm getting conflicting information about which way the resonator faces. The inside of my resonator has little louvres facing in one direction like so:

 

 

And the other direction looks like this:

 

 

I've read through a fair few threads where people say the louvres need to faces the engine so that they can trap exhaust flow and remove some of the sound, and others say that this will cause the packing inside the resonator to "burn out" and will restrict a significant amount of flow, and that the louvres need to face away from the engine.

 

So which way is the resonator meant to be installed? Or is it up to the user as to which way it is installed?

[nerfbat]

we have always faced the openings towards the engine mate. like your top pic.

but please, get other, smarter people's confirmation

[kickn5k]

we have always faced the openings towards the engine mate. like your top pic.

but please, get other, smarter people's confirmation

 

Yep top pick for me.

That's how it's fitted in my ke11. Using a 2" dia 18" long reso in mine dropped the noise down 20db! I was pretty shocked by the result.

[rian]

Thanks for the replies Zowie and Rob, openings towards the engine it is.

[iwontarolla]

 

 

Yep top pick for me.

That's how it's fitted in my ke11. Using a 2" dia 18" long reso in mine dropped the noise down 20db! I was pretty shocked by the result.

I'm having a problem where my 4k is way to loud. If I just put a longer hot dog in it will cut the sound but keep it still free flowing?

[B.L.Z.BUB]

 

I'm having a problem where my 4k is way to loud. If I just put a longer hot dog in it will cut the sound but keep it still free flowing?

 

Put a sports muffler on it

Edited January 5, 2013 by B.L.Z.BUB

[GJM85]

I'm using a 2in straight through system with an 18in resonator. Good sound not overly noisey.

Edited January 6, 2013 by GJM85

[altezzaclub]

If I just put a longer hot dog in it will cut the sound but keep it still free flowing?

 

'Yes' is the quick answer, but the real noise reducton comes from the last muffler at the end. Get the longest 2" resonator up front and a tri-chamber at the back.

 

What do you have on there at the moment?

[iwontarolla]

2 inch system with a 12inch hot dog then to a sports muffler but I have a feeling it's not doing much to cut down the noise.

[B.L.Z.BUB]

2 inch system with a 12inch hot dog then to a sports muffler but I have a feeling it's not doing much to cut down the noise.

 

I had the same. Mine was fine, sounds like your muffler isnt doing its job.

[altezzaclub]

It depends on what "sports muffler" means.. If that is also straight-through then it will all be noisy.

 

If it has a wall that the gases run into it will dampen well, that's why I like the three chambers idea. The pulses hit the wall that is stuffed behind with fibreglass while the gases just flow across the middle to go out the exit.

[iwontarolla]

I'm not actually sure what type of muffler it is, exhaust guy never went in to details. But I would guess its almost straight through. Have had police comment on it being way to loud. Ill have a play around. Cheers for the info

[KEI069]

Ok so the top photo will work better for noise reduction and the reverse direction better for flow. Can be used

Either way just depends how much noise your trying to drop. The newer hotdog resonators are a perforated internal

Tube with no directional louvres and flow much better and reduce more noise.

With mufflers, it comes down to volume, more volume = less noise. I never use tri flow mufflers. Every sports

muffler I fit is straight through glass packed with perforated tube. Bigger muffler for less noise with best

possible flow. The perforated tube gives a larger contact area for exhaust gas to fibreglass packing.

Hope this helps.