I put my stock silencer back on

[Cosmokenney]

I looked around for anyway to make the powercore quiet. I bought the quietest insert FMF makes for it but still no luck. I really wanted to keep it but finally gave up after my last ride. My riding buddy told me it was not too bad but I felt it was too loud. I could definitely hear it echo off buildings when I ride around town. So far I am very happy with the stock silencer. I even like the way it sounds!

I've heard that stainless steel packing wrapped tight, but not as tight as some of the mfgrs pack their fiber stuff can change the sound/volume for the better.

I've got some stainless at home for my KLR exhaust, but haven't gotten to that project yet. The stock packing in the lexx exhaust is so tight that it is taking for ever to burn off.

 

[95jersey]

Love my fmf power core and power bomb header. Definitely loud but I like loud. Doesn't hurt my ears. Loud is also subjective. Ever stand next to a race car or dragster. NASCAR car make any bike sound like a moped. I love to hear my engine open up and sing which is why I have strait pipes on my 600 hp z06

 

[Radar]

If you wrap your header you will be amazed at how much quieter the bike is.

 

[JamieHC]

But loud pipes save lives...

The noise keeps the drop bears away down here in 'Straya.

http://www.australiangeographic.com.au/news/2013/03/drop-bears-target-tourists,-study-says/

 

[huskylove]

Anyone try a DB dawk in a fmf pipe? I wonder if that is the hot ticket? I have used it in the past on a klx110 pit bike and a klx250sf to quiet them up! Works like a charm, but falls out in certain pipes too easily.

 

[268fords]

But loud pipes save lives...

The noise keeps the drop bears away down here in 'Straya.

http://www.australiangeographic.com.au/news/2013/03/drop-bears-target-tourists,-study-says/

I'm trying hard to believe this is real. Is it?

 

[New511Guy]

Anyone try a DB dawk in a fmf pipe? I wonder if that is the hot ticket? I have used it in the past on a klx110 pit bike and a klx250sf to quiet them up! Works like a charm, but falls out in certain pipes too easily.

What's a "DB dawk"?

 

[Huskynoobee]

I will be posting the pipe for sale.

I keep looking in the classifieds....

 

[huskylove]

I meant to say db dawg. They are a insert that goes in the end of the bipe, working like a actual baffle to cancel out some noise.

 

[RB7]

My experience with sound is that "lightweight" and "quiet" do not go together. Years ago I tried to quiet up a VW beetle using light weight house insulation and it didn't do anything to make it quieter. My friend and I insulated his garage to make it easier on the neighbors when the band practiced but found it did little or nothing. Then I picked up the trunk carpet on an older Cadillac. Oh my gosh, it weighed about 50 lbs.! It felt like there was lead woven in it. And that car was silent!. Cadillac had a handle on this quiet thing...
When I was a kid, we discovered that if we slipped a little 6 inch thin-wall aluminum extension over the stinger on my neighbor's expansion chamber exhaust (no muffler) the volume went up considerably. Stupidly, we thought it was "cool".
Later, I found that the best hood pads to quiet a car engine weigh a lot. If they are light, they probably will not work well.
The quietest car mufflers weigh a lot. If you dump your exhaust into a box made of thick steel, or better yet, lead, it will be pretty quiet. Dump the same exhaust into a thin wall aluminum box and it may even amplify the volume. I realize some of this is from the thin metal reverberating/ oil-canning.
Put a hollow door on a bedroom and it won't keep out sound. Put on a thick solid steel door and it will.
All the quiet Japanese bikes have pipes that weigh a ton .My XT225 has such a pipe.
Two stroke bikes frequently came with a double wall pipe (heavy) to keep the noise down.These factory engineers aren't dumb.
KTM in the nineties made a stealth/EPA model bike (rare) that among other things had a double wall pipe( if I remember right) to keep noise down.

Also don't forget that a lot of noise comes from the intake/airbox and you usually make the bike a lot noisier when you modify the intake sytem (removing snorkels etc.)

 

[JamieHC]

I'm trying hard to believe this is real. Is it?

Dead set true. At least 20,000 tourists are eaten each year. The drop bears have started moving into our cities now.

You could be walking down the main street of Melbourne, Sydney or Brisbane and the drop bears jump on you from the top of the sky scrapers.


They look cute and cuddly, but that's just hiding their lethal side.

 

[Motosportz]

Dead set true. At least 20,000 tourists are eaten each year. The drop bears have started moving into our cities now.

You could be walking down the main street of Melbourne, Sydney of Brisbane and the drop bears jump on you from the top of the sky scrapers.


They look cute and cuddly, but that's just hiding their lethal side.

so no, it is not true.

 

[Motosportz]

My experience with sound is that "lightweight" and "quiet" do not go together. Years ago I tried to quiet up a VW beetle using light weight house insulation and it didn't do anything to make it quieter. My friend and I insulated his garage to make it easier on the neighbors when the band practiced but found it did little or nothing. Then I picked up the trunk carpet on an older Cadillac. Oh my gosh, it weighed about 50 lbs.! It felt like there was lead woven in it. And that car was silent!. Cadillac had a handle on this quiet thing...
When I was a kid, we discovered that if we slipped a little 6 inch thin-wall aluminum extension over the stinger on my neighbor's expansion chamber exhaust (no muffler) the volume went up considerably. Stupidly, we thought it was "cool".
Later, I found that the best hood pads to quiet a car engine weigh a lot. If they are light, they probably will not work well.
The quietest car mufflers weigh a lot. If you dump your exhaust into a box made of thick steel, or better yet, lead, it will be pretty quiet. Dump the same exhaust into a thin wall aluminum box and it may even amplify the volume. I realize some of this is from the thin metal reverberating/ oil-canning.
Put a hollow door on a bedroom and it won't keep out sound. Put on a thick solid steel door and it will.
All the quiet Japanese bikes have pipes that weigh a ton .My XT225 has such a pipe.
Two stroke bikes frequently came with a double wall pipe (heavy) to keep the noise down.These factory engineers aren't dumb.
KTM in the nineties made a stealth/EPA model bike (rare) that among other things had a double wall pipe( if I remember right) to keep noise down.

Also don't forget that a lot of noise comes from the intake/airbox and you usually make the bike a lot noisier when you modify the intake sytem (removing snorkels etc.)

Sounds is vibration. Thin means it moves and causes more vibration, heavy thick means hard to move / less vibration and sound. It is very hard to make light quiet muffler and manufacturer really struggle with this.

 

[JamieHC]

No. But it might happen, Motosportz.

 

[Tinken]

Most men lay in bed dreaming of women or breakfast. Me, no, I dreamed of how to quiet a powercore4 exhaust below 90dB. I drew up a couple of CAD drawings and I will prototype them out when I get to feeling better. Sometimes you have to think outside of the box, in this case the muffler.

 

[huskylove]

Does it have legitimate baffles? Most pipes are just straight through glasspack style. I would like to see a muffler designed to remove drone, much less my corsa sport on my GTO.


Best sounding mufflers ever but very very heavy. I would think one of these in addition to glasspack and made from aluminum would definitely cancel out some of the loud bits.

 

[Tinken]

Those aren't baffles, they are Helmholtz resonators. Yoshimura uses this tech in their motorcycle exhausts.

 

[Mike-AK]

Most men lay in bed dreaming of women or breakfast. Me, no, I dreamed of how to quiet a powercore4 exhaust below 90dB. I drew up a couple of CAD drawings and I will prototype them out when I get to feeling better. Sometimes you have to think outside of the box, in this case the muffler.

Just buy a Q4?

 

[Mike-AK]

Those aren't baffles, they are Helmholtz resonators. Yoshimura uses this tech in their motorcycle exhausts.

FMF Powerbomb is a Heimholtz resonator.

 

[Tinken]

Well, FMF claims theirs is a bulbous resonator or some crap. There advertisement claims they invented the use of them on exhaust, blah blah...

Helmholtz resonators from 1935.