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deltana_guy
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Ways to make a dredge quite. ( 22:59:10 ThuJul 30 2009 )

Hi everyone,

I have a dredge with 6.5hp honda engine that I would like to weld a muffler onto to make it quite. The constant rattle and noise from the stock exhaust is to much towards the end of the day. I've seen some Youtube videos where the dredges were really quite and the owners were talking normally while the dredge operated. Would you guys recommend a muffler and if so what kind would be best or what about an idea welding an exhaust pipe to the stock muffler and putting it in the water? What are your thoughts?

  
deltana_guy
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Re: Ways to make a dredge quite. ( 02:05:10 FriJul 31 2009 )

I looked at the link, and found the muffler they are talking about. One person says its 50% quiter after its "worn in". I've seen those similar mufflers on dirt bikes and four-wheelers here in Alaska, they seem to be effective to reduce noise and heat, but the company only advretises 33% noise reduction.

Thats much better that I have one now. I'm thinking off getting one, but I'm still thinking of other options which might be quiter. Is having an exhaust pipe in the water quiter or is their a proportion of what type of engine; i.e. HP size, you have to what type of muffler you use?

  
LipCa
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Re: Ways to make a dredge quite. ( 04:21:23 FriJul 31 2009 )

as someone mentioned a few days ago, you may have to worry about the back pressure. I don't know...how do they exhaust the engine on an inboard engine boat?

  
eklawok
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Re: Ways to make a dredge quite. ( 07:26:19 FriJul 31 2009 )

On an inboard boat it depends on if it is a dry or wet exhaust system. For this I think you are talking about a wet system. On my boat (with a 4.3 chevy V-6) the back pressure (and noise) is controlled by the exhaust "tips" that run through the transom of the boat and are not submerged while on step. And they have flappers that keep the water from running up the exhaust system when not or coming off step. (Don't know if this helps, but it is how it is done)

Have you tried plain ol ear plugs? I have never used a dredge before, but I would think that ear plugs would work and be cheaper. Get the all plastics ones and not the foam ones. They will absorb water. And if you are under water dredging, how about those wax plugs that swimmers use. I can't see any wrong in that either. (I am sure somebody will correct me on that now)

  
goldcoastprospector
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Re: Ways to make a dredge quite. ( 13:44:56 FriJul 31 2009 )

Found this on another site, jackssmallengines.com . Mark

  
RUSTY_HAPPY_CAM
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Re: Ways to make a dredge quite. ( 02:45:58 SatAug 1 2009 )

Quieter street motorcycle mufflers for bikes of somewhere the same size are cheep at wrecking yards and very quite.

  
vortxrex
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Re: Ways to make a dredge quite. ( 22:40:34 SunAug 2 2009 )

If you really want quiet, install the muffler from a Generator. you can match them by engine size.

Dave Frank

  
Honza_Basta
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Re: Ways to make a dredge quite. ( 07:32:30 MonJun 19 2017 )

Itīs good to donīt disturb by noise in nature... :smile: I bought cheap chinese 5,5hp pump, but it was very much noisy. To I bought silencer for eletric generator. But I canīt mout it on, the pump has lerger diameter than generator. So I cut a piece of silencer wall off. There was nothink inside, just one drilled wall in the middle. So I filled it with glass insulating wool. Than hammered and welded it. Now, with this silencer the engine is silent like sewing machine...
I Iīm going to mount intake from generator - it may be also quieter...








  
Fleng
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Re: Ways to make a dredge quite. ( 18:04:58 MonJun 19 2017 )

A muffler is only half the battle. Internal combustion engines are loud because they run on explosions. You hear the exhaust but the cylinder head is making noise as well.

You must insulate the whole engine to get the system quiet.
Air is one of your best allies. An air pocket with lots of little barriers is a good way to go. There are some very expensive sound deadening panels available. Foam isn't a bad solution.
I see a lot of hospitals and nursing homes that don't want to disturb their patients or residents when the generator runs. They use insulation in the bellytank housing with a rainproof exhaust thimble and filter the fresh air intake.

Believe it or not you could build a light frame and just throw some blankets around it (being careful not to let them come into contact with hot pieces) and you can greatly decrease the overall noise. I'd use a welding blanket on the inside myself. The fresh air intake and exhaust still need to be accounted for in this.

  
Honza_Basta
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Re: Ways to make a dredge quite. ( 19:51:40 MonJun 19 2017 )

But there must be enough fresh air also for cooling engine. I have ordered 1/2" thick sound insulating foam. I plan to stick it onto frame and not hot parts of engine. Also may be some panels on the frame - along the side with the valve.
But even for now, with just silencer tunning the difference is great.






  
Honza_Basta
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Re: Ways to make a dredge quite. ( 19:56:12 MonJun 19 2017 )

This is good for pannels, bt it would soak with water and mud.



I prefer such kind, with vinil, or urethane washable skin. I had it in my van or around our house water pump/tank and it works.


  
JOE_S_INDY
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Re: Ways to make a dredge quite. ( 23:49:19 MonJun 19 2017 )

Just to say:

An old homesteader trick was to bury an empty 55 gallon drum in the ground next to the generator. Pipe the raw exhaust gasses into the one hole of the drum and leave the other hole open, but protected from rain and surface water. The large drum will quiet the exhaust noise a lot.

Not exactly usable here, but worth knowing anyway.

Joe



---
Wiser Mining Through Endless Personal Mistakes
 
 
Jim_Alaska
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Re: Ways to make a dredge quite. ( 13:41:51 TueJun 20 2017 )

Since this is an old thread I thought it may be beneficial to add a word of warning. A couple of posts spoke about silencing the exhaust by directing it under water.

This can be dangerous and even deadly in a dredging situation.

A few years back we had a guy here who was a very experienced dredger who decided to direct his dredge's exhaust under water to quiet it for reasons other than his own comfort. Suffice to say that he needed his dredge to not attract unwanted attention.

He never thought about the gasses from the exhaust rising to the surface and being sucked in to his fresh air intake on his Hookah system.

This mistake cost him his life, he was found dead under water and the dredge had run until it ran out of gas. They determined that he died of Carbon Monoxide poisoning.



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Jim_Alaska
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Honza_Basta
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Re: Ways to make a dredge quite. ( 16:32:18 TueJun 20 2017 )

Gas from engine - its always important.
But for now with wool in silencer I do not need to try underwater exhaust. Now intake is more noisy than silencer.

To Joeīs thought - there may be a way to have undrewater part of floating, serving as large long silencer at the same time. And exhaust itself may be tube up on the sluice end.

  
JOE_S_INDY
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Re: Ways to make a dredge quite. ( 21:27:25 TueJun 20 2017 )

I would just put the air intake on an extension, higher up than normal, from the surface of the water. Common enough (and pretty much a standard safety procedure) with T-80s and other air pumps on floating dredges.

Joe



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Wiser Mining Through Endless Personal Mistakes
 
 
Bonaro
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Re: Ways to make a dredge quite. ( 06:16:50 MonJun 26 2017 )

A couple things...
First the link above to the 49ermike forum post is dirty. I hit it 3 times and it tried to hijack my browser each time. It should be deleted.

The noise you hear comes from more than one place. Mostly from the exhaust but also from the cylinder because it is an air cooled motor and does not have a water jacket to absorb the sound.

You can quiet the exhaust by adding a generator muffler or supertrapp
You can quiet the cylinder by building some sort of water jacket but that's not easy or practical.

Another approach is to convert the motor to propane It make a lot less noise in the first place.



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My Dredge Sucks...
 
 
Jim_Alaska
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Re: Ways to make a dredge quite. ( 13:39:11 MonJun 26 2017 )

Dan, this is part of the problem when someone replies to an ancient thread. That thread was made eight years ago. 49mike's forum is no longer on the Internet, so someone copped the domain name.



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Jim_Alaska
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