Help! Duromax engine way too loud.

beachcarter

Guys, I put the Duromax 16 in my ezgo and its way too loud. The kit came with a header pipe and a super trapp muffler. Its way too loud. I called the guy who I bought key kit from and he recommended a muffler from summit racing. I put that on and its no quieter. Any ideas on how I can quieten this thing down? I'm going to get a ticket with this thing the way it is.

BGW

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fstg21

Did you add an open air filter as well?

Alot of sound comes from there.

Also, you should be using a 1.5 " or smaller inlet muffler.

I've used this one with good results: http://www.summitracing.com/parts/wlk-22266/overview/

The other way to quiet it down is add a long tube to the end of the muffler. like the stock muffler.

You can also use a freeze plug. You really only need a 1" opening unless you're hotrodding it. Stick a freeze plug in the muffler outlet and attach it with a sheet metal screw. drill a 1" hole in it before you do.

sho305

I think that walker is the one I used it was for an acura. I have no tailpipe it sounds like a garden tractor at full bore, the tone is a little more like an atv. However its not loud really, just loud compared to a stock golf cart. At 1/4 throttle and less it is near stock golf cart and very quiet. I bought it on amazon for $30 at the time and free shipping, used hangars from autozone and a header from robertson, and a coupling from him so I could put the muffler on the frame and not break my header. I have a SS tip on it, so I was thinking of mounting a freeze plug in there to reflect sound. Its maybe 2.5" inside the tip the exhaust could go around a smaller plug in there. I have read if you block the sight line through the muffler that helps a lot. Then again I like it like this lol, guess I need to make it move in/out so I can choose. It would be nice to be quieter at night. Or I could try a tailpipe. Yes I like to step on it at night sometimes. I posted videos of it under clonecart1 on youtube.

beachcarter

I have a walker muffler now. This one to be exact. http://www.summitracing.com/parts/wlk-21040 but its still too loud with that one. Do I need more tailpipe? I think I've heard that the longer the tail pipe the quieter it will be. Just for trial purposes I put the muffler that came with the motor on it just to hear how loud it would be stock and its still too loud with that on it. Keep in mind that I'm not using the original carb. I have a Mikuni 30mm carb on it. I'm assuming that muffler has too much back pressure because the cart ran like crap with it. Runs great with either the super trapp or the walker.

beachcarter

Sho, anyway you can post a pic of how you mounted that muffler to the frame w/o breaking the header? I know the muffler needs o be able to travel with the engine in order to keep it from breaking.I was thinking of mounting the muffler to the frame and extending the tailpie from maximum sound control and using some exhaust flex tubing to connect the muffler to the header so the travel could be absorbed by the flex tubing. Also can you please elaborate on the freeze plug idea and what it does? How would that quieten it?

natew121

Go to amazon I bought a kholer garden tractor muffler for 20$ all connected to agk header and pipe. sounds no louder than stock actually has a lowerr tone over the stock oem muffler also half the size so u can mount it in more places

beachcarter

Nate, anyway you can post a pic or maybe a video of it running so I can get an idea of how it looks and sounds?

sho305

Photos here and next page. More photos someplace but not sure where I posted them on an exhaust thread. http://www.buggiesgonewild.com/clone...-clone-bb.html

If you look at the green cart it has flex tube, put that one together in a hurry but is still working fine. But that muffler hung on swingarm not from frame. I have hangars right on the tube under the bagwell that bumper supports is on. There is a thread in yamaha something clone specs about that green cart I did first.

The coupling was from robertson torque tubes, really nice guy he made up the whole thing. Two halves slide together so I welded it to length I needed.

Has to do with how sound travels, it does better in a straight line so if you block the line you reduce sound. Some mufflers put a concave disk at the end of a tube to reflect sound back up the tube while the gases go around it. That is my thinking of putting a disk in the SS tip at end of muffler. Generally a muffler like that is 3 tubes in a reverse flow like a flat 'S'. With the last third pipe open you (I) am losing sound control of that tube....losing 1/3 of my muffler really because the sound can go straight down that tube and out. If sound has to turn or is reflected it will have to deal with the internal dampening of the muffler to find its way back out. I thought of making a valve for the end of the muffler and put a 1" tube behind it for a tailpipe then I could turn it on or open it to bypass. But no time I rather fit the carb/intake I want to work on should I get time. A tailpipe does the same thing it helps contain the sound to the muffler, a car muffler usually made to have one and works better with one. You could even take a 1" pipe or hose and duct tape it to the muffler outlet (on a car/tractor muffler) and run it to test just don't get it hot of course. 1" is the size of my header the second part is hair larger as that is what the performance guys seem to be using for mild/torque engines. I even thought about looking for 1" flexible copper to make a tailpipe from if I could find/afford/bend it lol. But lawn pipe parts are pretty cheap anyway most gokart places sell prebent pieces.

Also if you check my video in the snow you hear the intake sucking at front of cart it is pvc pipe. Should be pics in my build thread there. I plan to get a larger pvc pipe end and put on to cap the pipe that should quiet it down some. I don't hear it much on the cart the camera seems to pick it up. You can hear it better when the cart comes at you and it does open facing forward right now.

sho305

Open filter can make lots of intake noise. I used a car airbox and pvc to the front, in addition to minivan hose and fittings from carb to the box. It was fun piecing that stuff together lol but only have $30 into all of it or so. Airbox/hose was $10 at a boneyard.

geoffw

Why did you put a super trapp muffler on it if you wanted it quiet?

They are performance oriented and designed to be loud.