Loud, still very loud

[saxet]

While I do see the points AllenB and Gumph are getting at I work in an extremly safety concious enviroment. That is fuel stations and terminals.
Our company MUST comply or lose the contracts and we'll all need new jobs.
Unfortuantly buckets are in the same boat.
One of the things I love about racing is, once I've complied with the safety requirements I can then go and race like a lunatic.

One of my roles at work is to ensure our subcontractors comply with the safety regs and procedures. It's not much fun at times but if I don't do it they will also lose their contracts.

When all is said and done it's not a huge thing to keep the bikes quieter and we've found that if done well no power is lost and it's more of a drawcard for the public/spectators.

[bucketracer]

Maybe a good time to point out the big hp 2-strokes are very quiet too, so performance and good noise controll can be done.

What is the standard test method for sound levels at a race track???

I have heard different things like measuring at the fence, or at 45 deg and 25m behind the bike in question. I have also heard that at Kaitoki they hang the meter above the start finish line and catch the bikes going past on full song, that sounds like a good idea.

Is there a standard level and what are the parameters.

[bucketracer]

OK answered my own question.

10.6.3.1

95dB ride by with the meter 30m from the track center line.

[Kickaha]

What is the standard test method for sound levels at a race track???

I have heard different things like measuring at the fence, or at 45 deg and 25m behind the bike in question. I have also heard that at Kaitoki they hang the meter above the start finish line and catch the bikes going past on full song, that sounds like a good idea.

Is there a standard level and what are the parameters.

Kart rules can be found at http://www.kartsport.org.nz, search noist testing section M and are different with two ways of measuring (cant cut and paste for some reason)

I would think if you're at a kart track their rules would apply

[bucketracer]

Kart rules can be found at http://www.kartsport.org.nz, search noist testing section M

I couldn't get the subsection M to print either, will try again later.

I would think if you're at a kart track their rules would apply

Sounds reasonable.

[Yow Ling]

Untill one or two offenders are told to put their bike on the trailer, the people that dont respect the rule arent really going to be bothered

[AllanB]

Actually I have written many a protest letter over the years regarding racling and noise regulations, vehicle noise regulations, fireworks, blablabla. Fuck me I even vote every election. Fat lot of good any of it does as I'm a hetrosexual, white guy who actually works for a living. And the harder I work the more tax I pay so laws and conditions I disagree with can be enforced to keep a vocal minority happy.

Suppose you will support compulsary wearing of high-vis riding gear too?

[AllanB]

The CHCH Kart track has been around for absolute decades - The council allowed subdivisions to be developed closer and closer to it - guess who complained and guess who had to change.

[saxet]

I know what you mean and I hate to think where it's all going to end but as youv'e found out fighting it just dosn't seem to work.

[Str8 Jacket]

Actually I have written many a protest letter over the years regarding racling and noise regulations, vehicle noise regulations, fireworks, blablabla. Fuck me I even vote every election. Fat lot of good any of it does as I'm a hetrosexual, white guy who actually works for a living. And the harder I work the more tax I pay so laws and conditions I disagree with can be enforced to keep a vocal minority happy.

Suppose you will support compulsary wearing of high-vis riding gear too?

What part of shut the fuck up or you'll get ALL OF US kicked of the tracks forever don't you understand?

[Maha]

At 47 I'm old school and expect to go to motor races and hear LOUD machines. RACING MACHINES.

Fucking Mandy Pambie tree hugging bum fucking homo loving society expecting EVERYTHING to be wrapped in cotton wool.

Ahhh I feel better.

Steel wool I think you'll find....

[bucketracer]

Ok I still cant print or copy a page of the Kart Sport rules.

http://www.kartsport.org.nz/rules/rules-and-notices

Anyway page 157 talks about noise measurement, methods and limits at Kart Tracks.

I would think if you're at a kart track their rules would apply

Sounds reasonable to me.

Basically the preferred Karting method is a 106.4dB limit with the meter suspended 1.8m above the drive line at a point on the track where the Karts are accelerating hard and alternatively a 88dB limit with the meter 15m to the side of the drive line.

Karts also have to have inlet mufflers that reduce induction noise.

I guess we have to figure out how our MNZ mandated 95dB limit fits into this.

Maybe use two meters one 1.8m above the track with a max limit of 106.4dB like the Karts and another for a 95dB limit placed 30m from the racing center line for MNZ and have bikes comply with both limits.

We have a sound meter (we brought it to ensure all of our bikes were in prescribed limits; and its been calibrated against one of the local councils' units); I'll bring it to the next north island round.

I'd be happy to supply them at cost to others if anyone is interested.

Bert how much did you pay for yours??

So there it is, easy to understand limits and how to measure them and cost price meters, so there are no excuses now because its easy for riders, teams or the organizers to implement if they want to.

[RDjase]

Ok I still cant print or copy a page of the Kart Sport rules.

http://www.kartsport.org.nz/rules/rules-and-notices

Anyway page 157 talks about noise measurement, methods and limits at Kart Tracks.



Sounds reasonable to me.

Basically the preferred Karting method is a 106.4dB limit with the meter suspended 1.8m above the drive line at a point on the track where the Karts are accelerating hard and alternatively a 88dB limit with the meter 15m to the side of the drive line.

Karts also have to have inlet mufflers that reduce induction noise.

I guess we have to figure out how our MNZ mandated 95dB limit fits into this.

Maybe use two meters one 1.8m above the track with a max limit of 106.4dB like the Karts and another for a 95dB limit placed 30m from the racing center line for MNZ and have bikes comply with both limits.



Bert how much did you pay for yours??

So there it is, easy to understand limits and how to measure them and cost price meters, so there are no excuses now because its easy for riders, teams or the organizers to implement if they want to.

http://www.jaycar.co.nz/productView....d&form=KEYWORD

Data logging sound meter,

Would be good to have a the track in various positions and see how the sound is affected by groups of bikes and bikes separatly

There are other sound meters at Jaycar starting from $47

http://www.jaycar.co.nz/productView....d&form=KEYWORD

$119

http://www.jaycar.co.nz/productView....d&form=KEYWORD

Dont know how good they are but its a start point to sort out the noise problem that WILL shut down more tracks if it isnt sorted !

[Bert]

...........

Bert how much did you pay for yours??

So there it is, easy to understand limits and how to measure them and cost price meters, so there are no excuses now because its easy for riders, teams or the organizers to implement if they want to.

About 35 bucks. The datalogging version is ~70 including shipping.
Calibration is a bit of an ass if it incorrect. You just have to except a correction factor or. Chuck in the bin

Jase has a valid point as multiple bikes (producing simpler frequencies will produce a loader sound). Thus while everyone should be under the maximum values all attempts should be made to get them as quite as possible.

[jasonu]

T


Up to now buckets have been quite loose, .

In the 90's at Mt Welli sound was a huge issue as we and the Kart club were trying for a new venue so it was not uncommon for noisy machines to be sent home. It was mostly new people that didn't know any better but they soon learnt.
It worked well, not sure what happened to this policy.