Exhaust muffler

[pearl111]

Hi DIY, I would like to know if there is an exhaust and or muffler out there that sounds like nice roar of a drag bike. I don't want a straight header pipe (to loud). The motor I have is a hemi 212 predator. I have the basic cheap muffler on it now and would like something different.
Thought of drilling some holes in muffler. Has anyone done this? I wonder should I try this first? There are to many mufflers to pick from. I don't want to spend all my money tryin to find one that works. What to do? Thanks for any help.

 

[KartFab]

drag bikes dont have mufflers, so you wont get that. The straight pipe with a RLV muffler is probably what you are looking for.

 

[itsid]

a couple of years ago a fellow german posted his mini bike creation
(and a test ride in his grandma's backyard)

He had a nice sounding exhaust IMHO
the thread I am refering to

http://www.youtube.com/watch?v=aNkN7Myv17Q

ebay link in his thread above..
for quick reference : ebay itemID: 221184283989

'sid

 

[KingCobra]

Look into racing go kart>> TUNED RACING MUFFLERS<< YOU need good hollow echo chambers in them. Just like the 'music' BASS you hear in comp speakers, it's not all how the speaker is made, they have echo chambers in the speaker box also to tune the sound before it exits......

REMEMBER!! The larger your engine in hp or cc makes all the difference. Your not going to get good 'throaty' sound from a 3 or 4 hp engine in my opinion.......

What size engine are you asking this for? 5 hp would be a tough one still, to get good sound. Most in this range would be better off to use the straight pipe.

https://www.youtube.com/watch?v=sGFSywV_SBU

TRY 'GO POWER SPORTS' dot COM

 

[KingCobra]

a couple of years ago a fellow german posted his mini bike creation
(and a test ride in his grandma's backyard)

He had a nice sounding exhaust IMHO
the thread I am refering to

http://www.youtube.com/watch?v=aNkN7Myv17Q

ebay link in his thread above..
for quick reference : ebay itemID: 221184283989

'sid

I agree and the length of that pipe allows the sound to resonate to a better tone and that muffler is just the icing on the cake. That is why racing go karts have long pipes leading to a chambered muffler. GOOD STUFF HERE!!! I've been wanting better sound for my Kart "The Sand Man'..

 

[Ebrownie]

https://www.youtube.com/watch?v=sGFSywV_SBU

That video is irrelevant because that exhaust is an expansion chamber for a two stroke. The expansion chamber is for increased performance and reducing unburned fuel going through the exhaust, not for sound. Plus two strokes sound way different anyways.

 

[Whitetrashrocker]

Just put a straight pipe on it. The longer the pipe the deeper the tone.
I made a video where I ran a stock exhaust and then switched to a pipe. I had a DB meter going and it was not any louder but it sounded way better.

https://youtube.com/watch?v=vuxwRd3Sr6k

 

[KingCobra]

That video is irrelevant because that exhaust is an expansion chamber for a two stroke. The expansion chamber is for increased performance and reducing unburned fuel going through the exhaust, not for sound. Plus two strokes sound way different anyways.

Are you saying that it can't be adapted to a 4 stroke for throaty sound???:toetap05:

 

[KingCobra]

Just put a straight pipe on it. The longer the pipe the deeper the tone.
I made a video where I ran a stock exhaust and then switched to a pipe. I had a DB meter going and it was not any louder but it sounded way better.

I have to agree and here's one I got with my kart originally........

 

[itsid]

Are you saying that it can't be adapted to a 4 stroke for throaty sound???:toetap05:

that's basically what he's saying.. and he's kind of correct

that exhaust mounted on a 4 stroke engine would likely not only sound different (waaaay different) but also cost about half of the 200ccs horsepower, since it's specifically taylored for 100cc engines
and to produce a serious amount of backpressure.
both is unlikely to be good for a 200cc 4stroke engine

Sure you can hollow it out completely and pack it with a straight tube and some padding.. even dial in the sound to your likings (and yes.. throaty is an option for that )
but that'd be a different exhaust then
A DIY exhaust I'd call it rather than an adaption..
since frankly an empty aluminium can is all that you'd be left with to start from really..

'sid

 

[KingCobra]

"like nice roar of a drag bike".
Thought of drilling some holes in muffler. Has anyone done this? I wonder should I try this first? There are to many mufflers to pick from. I don't want to spend all my money tryin to find one that works. What to do? Thanks for any help.

Do not drill holes in your muffler. You will just get 'air flutter'. They are tuned for the best sound you can get out of them. What size engines are on them so-called 'Drag Bikes'?? 1000+ cc?? The larger the engine, the larger the pistons etc. the larger the combustion , the 'throatier' they will sound.

 

[anickode]

Use a long header. I like the sound of a 3-4 foot long header. Start out at or around the stock inside diameter, and step it up as you move down the pipe.

If you look in my budget build-off thread in the kart discussion forum, there's a vid of an Intek 190 running with one that goes from .810 to .875 to 1.05 over a ~3' length. The audio is crappy because I recorded it on my phone, but you can kind of get an idea.

Don't know what kind of "drag bike" sound you're looking for, but you're never gonna make a 212 cc one-lunger sound like a 1500 hp 160in³ turbocharged nitromethane pro-stock Harley.

 

[pearl111]

Thanks for everyone who help. Looks like I have some experimenting to do. All this info will come in handy. I'm sure I should be able to come up with the sound that I am looking for and save money doing so.