Coming Soon
Home > Forum


Author Topic: Sound Testing unfair to the two stroke  (Read 11922 times)

0 Members and 1 Guest are viewing this topic.

Offline suzukipride

  • Novice
  • *
  • Posts: 11
    • View Profile
Sound Testing unfair to the two stroke
« on: April 07, 2013, 03:13:03 AM »
The motocross club I race/ride at is taking every measure they can to satisfy the whining neighbors who moved to an INDUSTRIAL area where the absolutely knew a motocross track was located as well (for 50 years in fact, before those houses were built!).

We have built sound barrier walls, not enough to satisfy. Now, sound testing is mandatory to ride and the level is 94!

My four strokes have no problem meeting this level. Even my 450 passes with a stock exhaust.

People are failing left and right with two strokes and it's unfair. Two strokes can be loud, standing next to them, but the sound is not traveling as far as the 250f and 450f bikes, which is the entire point to all this strict testing.

I recently put on an FMF fatty and Powercore II (not the shorty) silencer on my 2007 RM125. Has 6 hours of riding time on it. I'm REALLY hoping it passes. I guess if it doesn't, I will try the factory silencer and new packing but I really don't want to kill the extra power the fmf package produced. Any silencer recommendations for 94 db with minimal if any power loss?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline msmola2002

  • Expert
  • ****
  • Posts: 100
    • View Profile
Sound Testing unfair to the two stroke
« Reply #1 on: April 07, 2013, 03:21:26 AM »
Is that milford by any chance?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline suzukipride

  • Novice
  • *
  • Posts: 11
    • View Profile
Sound Testing unfair to the two stroke
« Reply #2 on: April 07, 2013, 03:21:43 AM »
Yes!
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline msmola2002

  • Expert
  • ****
  • Posts: 100
    • View Profile
Sound Testing unfair to the two stroke
« Reply #3 on: April 07, 2013, 03:25:01 AM »
Nice track, did the 2 masters of mini rounds there :)

Saw the fences and I know they have testing, shitty situation you guys have.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline suzukipride

  • Novice
  • *
  • Posts: 11
    • View Profile
Sound Testing unfair to the two stroke
« Reply #4 on: April 07, 2013, 03:29:32 AM »
Indeed it is! The neighbors are still complaining, sound testing is being used as a last resort. I fear for what's to come in the near future if the complaining continues.....

I'm trying to find the AMA sound testing guidelines. From what I have heard, yes, the new AMA standard is 94db, but I believe it is still 96db for the two strokes AND/or, tested at a different RPM than the 4 strokes.

 If I can find these guidelines, I may be able to bring it up at a club meeting in honor of those who still want to ride our two strokes without completely killing the power output, while the four strokes continue to ride with further noise travel  :<img src=" title="Roll Eyes" class="smiley">
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline Jeram

  • Novice
  • *
  • Posts: 1
    • View Profile
Sound Testing unfair to the two stroke
« Reply #5 on: April 07, 2013, 04:00:34 AM »
Put some steel wool in your silencer for scritineering ;)


Failing that, for road worthy inspections on my road 2T's, there are a few tricks to get the detectable noise levels down.


The exhaust tip should face towards the ground which means the sound travels twice as far (pipe to ground to sensor) and encounters losses when it hits the ground and reflects, to further the effect of this mod, the downward facing spout does not need to be made of metal, you could use a silicon hose peice which would absorb more sound.

Thirdly: cut your expansion chamber open, extend the stinger inside the pipe so that the stinger tube opening is now several inches inside the pipe, not at the end. This decreases sound levels by a large amount and does not affect performance at all.

Get a good fabricator to take everyones exhaust system and carry out all the mods at the same time on everyones bikes.
Will make it nice and cheap and then there will be zero issues regarding noise tests!
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline cnrcpla

  • Novice
  • *
  • Posts: 0
    • View Profile
Sound Testing unfair to the two stroke
« Reply #6 on: April 07, 2013, 04:08:38 AM »
Stuff a rag in the pipe  ;) Just kidding, but the above posts are some good ideas. It's BS that people knowingly move next to a track and not think of noise. Its like moving next to a farm and hating the smell  :<img src=" title="Roll Eyes" class="smiley">
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline vetman

  • Posts: 0
    • View Profile
Sound Testing unfair to the two stroke
« Reply #7 on: April 07, 2013, 06:17:47 AM »
Its not just your end of the world fullas,we are getting it here as well although luckily enough we have a bit of space to move around in but we have lost four moto tracks which were out in farm country because nimbys (not in my back yard) have sold there flash house in the city ,moved to the country and expect no noise at all,then complain like heck when they hear a tractor/motorbike etc it got so bad one farmer here got noise complaints when cropping and had to shut down  but good luck with a bit of luck they might move on and you will get ya track back
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline 2T Institute

  • Expert
  • ****
  • Posts: 225
    • View Profile
Sound Testing unfair to the two stroke
« Reply #8 on: April 07, 2013, 10:50:09 AM »
Put some steel wool in your silencer for scritineering ;)


Failing that, for road worthy inspections on my road 2T's, there are a few tricks to get the detectable noise levels down.


The exhaust tip should face towards the ground which means the sound travels twice as far (pipe to ground to sensor) and encounters losses when it hits the ground and reflects, to further the effect of this mod, the downward facing spout does not need to be made of metal, you could use a silicon hose peice which would absorb more sound.


Thirdly: cut your expansion chamber open, extend the stinger inside the pipe so that the stinger tube opening is now several inches inside the pipe, not at the end. This decreases sound levels by a large amount and does not affect performance at all.

Get a good fabricator to take everyones exhaust system and carry out all the mods at the same time on everyones bikes.
Will make it nice and cheap and then there will be zero issues regarding noise tests!
Few more of these posts and I won't need to type anything.
Plus retard your ignition for a static test and put heat wrap on the front half of the pipe if it's a ride by test.

Main thing is you actualy realise that if you make less noise you get to keep your track. When housing extends close to circuits, developers and councils get greedy they will always say 'they are acting on complaints received' but I am suspecting this is a bit of a red herring. As just about EVERY circuit I have seen close quickly turns into a housing estate.
You can also purchase a dB meter very cheaply to conduct your own testing and if anyone does decide to turn up with a meter you have your own on hand. Once at a Speedway event at the Old Sydney Show ground (was used for regular speedway until the 70's) when leaving we came upon the EPA doing noise testing (bikes and cars had to be fitted with big mufflers) I asked the fellow what readings he was getting, he said the crowd noise registered the highest at over 100dB. I asked him how the speedway crowd noise is different to the crowd noise from the  adjacent large football and cricket stadiums and did they ever do any noise testing  then? His response was to pack up and leave !
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline SachsGS

  • Professional
  • *****
  • Posts: 1235
    • View Profile
Sound Testing unfair to the two stroke
« Reply #9 on: April 07, 2013, 02:48:33 PM »
City councilors change zoning to allow residential development, property taxes go up, motorsports park owners can't afford new rates and facility gets turned into strip mall. Saw it happen many times.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline eprovenzano

  • Professional
  • *****
  • Posts: 617
    • View Profile
Sound Testing unfair to the two stroke
« Reply #10 on: April 07, 2013, 04:18:15 PM »
SachsGS not to mention the lack of riders at the tracks, the ever rising cost of insurance, and with the property value increasing (because of the development). Many of the track owners have no choice but to sell out, take the money and do something else. 

Sometimes I can't blame them...  I'm sure they too get fed up with trying to please the powers to be.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
Eric Provenzano
2019 KTM 300 XCW TPI
2000 KTM 300 EXC (Son's)
2001 KTM 380 EXC
Sold 1991 KDX 200... fun play bike
Sold 1999 KX250
Sold 1999 YZ125 (son's)
Sold 2001 Yamaha TTL 125 (son's 1st bike)
Sold but never forgotten 1974 Honda Elsinore CR250M
Sold 1974 Honda Elsinore CR125

Offline kim wedding

  • Posts: 0
    • View Profile
Sound Testing unfair to the two stroke
« Reply #11 on: April 07, 2013, 05:16:47 PM »
It would be nice if some judge would tell the complainer's to get some ear plug's and stop crying about dirt bike's. I mean think about how during the day people should be allowed to make noise. If you work in some industries the noise is deafing and that's ok. If you live close to one of these plant's and complain and go to court the company usually win's.

If it's so easy to make a 2 stroke quietier and not lose performance WHY DOES'NT SOME ONE BUILD THESE PIPE'S FOR THE RIDER'S. It's a no brainer. Quieter bike's mean's more place's to ride or we find out it's an excuse to take the land for another subdivision. I've been told if you ceramic coat a pipe it make's it quieter and add's performance. You can wrap a pipe as well as add a pipe protector doesn't that make em quieter? Sound's like a business to me. Food for thought.  KIM
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline suzukipride

  • Novice
  • *
  • Posts: 11
    • View Profile
Sound Testing unfair to the two stroke
« Reply #12 on: April 07, 2013, 08:28:11 PM »
I agree Kim.

We, as a club, have sacrificed our riding hours for these complainers. We have built quite an impressive sound wall with sound reflective material. We have implemented the 94 db sound test. Nothing seems to please =(
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline kim wedding

  • Posts: 0
    • View Profile
Sound Testing unfair to the two stroke
« Reply #13 on: April 07, 2013, 09:16:15 PM »
Suzukipride, I hate to say this but maybe you and the other member's of you're club need to sue the crybaby in multiple lawsuit's for civil right's violation's. Do to them what they want to do to you. If you or any member live's by the crybaby when they mow their lawn CALL THE POLICE. If they make any noise at all call the police. Their calling them on you flip the script.

I know that thinking's caused this crap in the first place, but usually it's us the rider's getting crapped on. Sue the loser claiming they have affected you're mental health. If you can't ride you're track you're going thru depression and they caused it. Have another sue over their physical health deterating cause some loser's crying over alittle noise during the day.  My point is when they have to appear in court constantly maybe alittle bike noise won't sound so bad.

If you can make you're bike or all the 2 stroke's quieter by the above mentioned post's DO IT..... Talk to some of you're club member's and test the option's and do a fix it post. You might help not just yourself but all 2 stroker's in the world. Still wish it was as easy as the crybaby shuttin up or a judge telling them to get some ear plug's and shuttin up. Jeram had some good idea's and i thru out a few and if they all work 2 stroke's might be super quiet. Just a thought GOOD LUCK no matter what you guy's do.  KIM
« Last Edit: December 31, 1969, 04:00:00 PM by ' »

Offline 2T Institute

  • Expert
  • ****
  • Posts: 225
    • View Profile
Sound Testing unfair to the two stroke
« Reply #14 on: April 07, 2013, 09:25:34 PM »
Get some independant accredited testing done. If the council come back to you you can say you have had noise testing results and they are with councils guidelines etc etc
« Last Edit: December 31, 1969, 04:00:00 PM by ' »