How to make the bike quieter - ADVrider

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How to make the bike quieter

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02-10-

2011, 09:46AM

#1

Ni3ousDouble AxleRider

Joined: Oct2009Location:SloveniaOddometer:48

How to make the bike quieter

Hi to all!

I have made my own exhaust for my tenere 660. I like the sound, its deep and powerfull... but its too loud for myneighbours. Even when I ride it slow, they think (only by sound-loudness), that I ride it (too) fast. So you can guess

what they think about it.When I ride in woods I also disturb animals and hikers, so no good there also, not aproved..

So I need to make it quieter, but I already did all I could think of... so would need any advice what I can do to fix thatissue. I need to make it quieter and try not to loose power. I already have the akrapovi wool stuffing, steel mesh,three blockages, AIS removed...

Here are some pics how the exhaust is made...

Inside-blockages:


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Steel mesh wraped:

Wool stuffing:




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Aluminium can:




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I did all i could, but its not enough...

Any idea?__________________

Tnr Spirit

02-10-2011, 10:28 AM #2

Strong Badn00balicious

Joined: Oct 2007Oddometer: 1,660

Try off setting the holes in your baffles. In other words, don't center the holes and then staggerthem so you have little straight through passage.__________________

"I couldn't wait for success, so I went on without it."

02-10-2011, 11:41 AM #3

mike-s2 squeaky wheelsJoined: Jun 2007Location: Sydney, AusOddometer: 323

There are a few design ideas that you may want to consider.




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Theres the two pipes going side by side where the exhaust goes out one perforated tube and into

another. In the above pic the tubes are sealed off at the end so the gas cant bypass the perforated

sections.

There are other types of baffling where the tubes pass through from one section to the other. Oftenthese ones will have extended length tubes where the gasses are forced to double back out of one

tube to get into the other one to make its way out.

I hope this helps you with your design ideas.

02-10-2011, 01:27 PM #4

mungGnarly AdventurerJoined: Apr 2008Oddometer: 149

Quieter Muff

Try adding an elbow shaped turned down tip. It will aim the exhaust at the ground and seem quieter.

02-10-2011, 03:41 PM #5

metlcutr55LongGoneDaddy

Joined: Dec 2004Location: s w NHOddometer: 785

i modded an atv rac ing exhaust to the klr. had a fully open end like yours. bike ran weaker than

stock. made an end plate with enuf holes (20 at .19 dia) to add some back presure. quieter and runsstronger than stock. disclaimer: power evaluations by ear/ass dyno.

.__________________

My mammy was a shewolf, my daddy was a bar.I'm 200 pounds of tooth and claw, covered oer in har.

Half fire, half smoke, the other half thunder.I am what you may call the 8th wonder.Hey look out boys, get out the way, ladies get in line.

I aint perfect but almost, I'm dyin' if I'm lyin'

02-10-2011, 06:49 PM #6

CycleDoc59Gnarly Adventurer

Joined: May 2006Location: East VirginiaOddometer: 150

One solution for straight- through glass pack mufflers isto install turbulators. These are thin metal twists or spiralsthat push gases out against the sides of the inner muffler

perforated tubing.

This forces some of the gases - and noise into the packing.By varying the length of the turbulators, the level of noise

can be regulated.

This same principal is used to improved boiler efficiency.You can; and may, have to make your own, but here arelinks with info and photos as examples: one is a spiral,

the other, easier to make, is a zig-zag:

http://www.alcotwin.com/turbulators.html

http://www.fuelefficiencyllc.com/feturb.html

Another solution is a to reduce the size of the mufflerexit. It doesn't take a lot to make a difference. A large




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"washer", the same OD as the exit can be installed rightat the exit. If the exit is 2", a washer ID of maybe 1-1/2"

should make a substantial difference in noise. The washerincreases back pressure a small amount, forcing gases, and

noise, into the packing.......

02-10-2011, 07:59 PM #7

hugemothStudly Adventurer

Joined: Sep 2007Location: Bend, OregonOddometer: 973

Excellent idea. I'm going to try that on my noisy little bike.

Quote:

Originally Posted by CycleDoc59

One solution for straight-through glass pack mufflers isto install turbulators. These are thin metal twists or spirals

that push gases out against the sides of the inner mufflerperforated tubing.

02-11-2011, 11:41 AM #8

hugemothStudly Adventurer

Joined: Sep 2007Location: Bend, OregonOddometer: 973

I made and installed a turbulator today Simply cut a piece of sheet metal, twisted it, and inserted it

into the tube ahead of the baffle. Riveted the can back together and tested it. It definitely reducedthe noise level and probably adds very little back pressure.

Thanks for the idea.

02-11-2011, 11:39 PM #9

Ni3ousDouble Axle Rider

Joined: Oct 2009Location: SloveniaOddometer: 48

Those are some very good ideas!Thank you boys!

I have to choose which one could be the best for me and do it.Will have to make whole new interior. But we like to do some cutting and welding .

Thank you wery much, will report what I did, and what is the difference.__________________

Tnr Spirit

02-12-2011, 04:47 PM #10

WI-riderGnarly AdventurerJoined: Oct 2010Oddometer: 211

I found a thread on a Harley site where they talk about making/modding mufflers. Alot of good

information on how they are made and what they get out of the muffler with different ideas. Tons ofinformation over there.

http://xlforum.net/vbportal/forums/s...ad.php?t=16948

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