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Old 05-29-2019, 08:25 PM
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Default RLV Muffler

Ok so I have basically a “straight pipe” on my 208cc clone engine, it’s about 15in and has a 45° bend in it

Well it’s absolutely insanely loud which I expected, but it annoyed the neighborhood and it makes my ears sore as well.
And then RLV mufflers worth it in anyone’s opinion?

Other options?
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Old 05-29-2019, 08:36 PM
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The common sausage mufflers offer a bit of silencing and not too much restriction.

I have never seen the interior baffling inside an RLV. Anyone have a source for a dissected view? They're way too expensive for what they are, IMO.

On the other hand, you might search up pit bike and scooter mufflers on the interwebz (Fleabay) and look for the needed ID inlet you need.
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Old 05-29-2019, 08:39 PM
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Mine had one of those screw in lawnmower mufflers. Quieted it down enough to be considered acceptable by my mother. It's not really the best for looks and performance tho. And I'm interested in hearing the alternatives too, my muffler's pretty beat up.
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Old 05-29-2019, 08:45 PM
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Default For example

Maybe something like this... $16.47, shipped

https://www.ebay.com/itm/28mm-Big-Bo...EAAOSw2hxcGzKC

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Old 05-29-2019, 08:49 PM
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Yes possible, while trying to do research on it I came across one of kartfabs videos where he used something like that, but it didn’t seem to help.

Maybe he could chime in?
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Old 05-30-2019, 03:15 AM
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I have two RLV mufflers and I love the sound they put out.
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Old 05-30-2019, 06:46 AM
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But do they make it quite?
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Old 05-30-2019, 08:57 AM
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No they do not make it quite. Just a sound that I like, but they are not very quite.
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Old 05-30-2019, 09:08 AM
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You might be able to use a junkyard exhaust off of a Buick, they're pretty quiet. I had a Lesabre sneak up on me in a parking lot once, all that I could hear was the tires and a slight whistling sound which I think was the cooling fans.
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Old 05-30-2019, 10:36 AM
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I imagine a 30lb muffler that's larger than the engine would quiet things down.

Retrofitting something off a 250cc 4-stroke bike would probably be an effective way to cut the noise way down without hurting power.
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Old 05-30-2019, 02:05 PM
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Quote:
Originally Posted by 950speed View Post
Yes possible, while trying to do research on it I came across one of kartfabs videos where he used something like that, but it didn’t seem to help.

Maybe he could chime in?
1) stock muffler will be good haha
2) open pipe is loud yes
3) ebay muffler for pit bike is just like running and open header anyway. I honestly believe they are made to make a 125cc pit bike sound louder than the stock muffler
4) RLV mufflers do work ok but they dont work really well like you would expect a muffler to work. They do actually quiet the noise down a bit. The cross section is perforated steel circles (a big circle with smaller circles punched into it). The open RLV muffler is like a square mesh that doesnt do much muffling at all.
5) if you want your mini bike to be quiet, you need to find a 4 stroke muffler off a stock 4 stroke dirt bike. People are always wanting to make their stuff loud, or "deep sounding" and they pull the stock muffler off and sell it on ebay. If you get a honda grom muffler, it has a 1" ID inlet on it that will fit most 1" headers that are common for predator 212 engines. I put one on my nephews mini bike and he was ****ed because it actually worked (he liked ear bleeding pops). The thing is actually really really good at being a muffler. Again, honda grom muffler. search for a used one on ebay. With that said though, the trade off for a muffler that works is size and weight. Its going to be HUGE and heavy.

Good luck.

here are some videos on the bike im talking about. This is after he trashed the seal of the muffler wrecking his bike. Even with the bad seal it still is quiet.

https://youtu.be/CPjUuhnYHxU?t=295

And then i did a video with carsand cameras when it was running quiet. Should have added a second support but you can see how big it is.

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Old 05-30-2019, 03:51 PM
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Well I’d rather have a big and heavy muffler than mad neighbors and no fun, it’s a trade off
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Old 05-31-2019, 03:20 PM
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What about something like a glass pack, where the glasses are directed straight out(I think)? Anyone use these?
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Old 05-31-2019, 05:13 PM
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Straight-through mufflers like that are usually still loud. They generally take out the harsh pop, but leave the booming low tones and those are what can be heard most at long distances.

I have a pair of 2.5" glasspacks on my '68 Mustang and they're not illegally loud, but they're not very subtle either.
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Old 05-31-2019, 07:55 PM
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The 3/4" screw-on sausage mufflers are pretty good; there's a center solid baffle (meaning you cannot see end to end) but the sides are perforated sheet steel, so the exhaust flows around it and out.

I have one on a rebuilt roto tiller I just finished; it's screwed into a 45° NPT (Nat'l Pipe Thread) elbow I bought at a hardware store. It's throaty and deep.

BUT...you need a female coupler on your pipe...

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Old 05-31-2019, 08:11 PM
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I've got one right now. Hose clamp and slit in rhe pipe to hold it. Just did it tonight, before it had a nut welded to the pipe with a bolt in it to hold the muffler. Broke the bolt so now this.
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Old 05-31-2019, 08:20 PM
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Quote:
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I've got one right now.
It's a decent muffler isn't it? How you like the sound muffling?
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Old 05-31-2019, 09:24 PM
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Have a motorcycle helmet on when I ride so it's nice and quiet in there. But overall it does it's job and I can still spit flames out it so I'm happy. And so is my mother. she doesn't have to hear it.
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Old 05-31-2019, 10:11 PM
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The straight pipe is fun and all for the first 10-15 minutes of every run, but then it kinda gets irritating, plus off-throttle and decelerating creates quite a racket of popping and backfiring...also fun but then not so much.

There's a seller andrei-x on fleabay that's doing header pipes with a 3/4" coupler. And OMB too for that matter.

https://www.ebay.com/itm/Exhaust-Wit...266b%7Ciid%3A1
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Old 06-01-2019, 07:15 AM
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But it won’t cause much restriction correct? Mostly in the lower rpms is where I am wanting most power ~3000rpm or so
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