Noise at Kaitoke

[F5 Dave]

This in from Fish & it makes sense to post it here

Hi Guys it has come to the kart clubs attention that the bikes are well over the acceptable level of noise. This was raised at the AGM last night, one of the kart members had a DBA meter at the last meeting and it seems that the bikes are about 20 DBA noisier than the karts with bikes around the 100 DBA mark. As I have said in the past, if you have a noisy bike PLEASE PLEASE make an effort to make it quiet! There will be a noise meter in place over the next few meeting so we can sort the issue out. If you get approached by someone on a race day please see what you can do with your bike to make it quiet. If your bike is deemed to be over noisy you will be asked to remove it until it can be made quiet.


Just remember that Roy’s Hill in the Hawkes Bay has suspended bike racing at that track due to noise complaints lets not have it happen here?? You have been warned.

Lets not lose a great track!

If you have any question please get back to me by email or at the track.


Fishie

[White trash]

Phuckin four strokes........................

[mossy1200]

I thought the loudest thing at the track was the rotax carts warming up in the pits.

[richban]

I thought the loadest thing at the track was the rotax carts warming up in the pits.

Some of the new bikes are just crazy loud. People are running really small volume, cheap mufflers. They don't work.

[mossy1200]

Some of the new bikes are just crazy loud. People are running really small volume, cheap mufflers. They don't work.

I just bought one but I think it may only ever see one round while I get a good system made.
It was such cheap crap metal on the end caps that welding was a issue.
Once I have some clipons ill try get it running and see if its quiet enough to run.

[Kickaha]

Hi Guys it has come to the kart clubs attention that the bikes are well over the acceptable level of noise. This was raised at the AGM last night, one of the kart members had a DBA meter at the last meeting and it seems that the bikes are about 20 DBA noisier than the karts with bikes around the 100 DBA mark. As I have said in the past, if you have a noisy bike PLEASE PLEASE make an effort to make it quiet! There will be a noise meter in place over the next few meeting so we can sort the issue out. If you get approached by someone on a race day please see what you can do with your bike to make it quiet. If your bike is deemed to be over noisy you will be asked to remove it until it can be made quiet.

Do you know what method they were using?

http://www.kartsport.org.nz/download...l_2012_Web.pdf

section M4 is about noise testing and what we had to comply with when I was racing Karts

[Bert]

Some of the new bikes are just crazy loud....

Not just new bikes Rich.

Team GPR just purchased a noise meter (I've just got to check its calibration against my work unit) to help us keep an eye on all of our bikes (not just buckets).
We can bring it down to the next meeting and make it available...

But you are right the cheap pit bike mufflers are rubbish and everyone needs to make more of an effort to quieten things down.

I would have thought that all bikes need to conform to the NMZ noise limits (and the rest of the Technical rules for the class): (Noise - 10.6.3.1 Chapter_10)

Do you know what method they were using? http://www.kartsport.org.nz/download...l_2012_Web.pdf section M4 is about noise testing and what we had to comply with when I was racing Karts

or given Wellington running under karts; conforming to their rules (kart sport); which are tighter (either method) as Kickaha provided (Page 157);
I've noted a couple of times in the past a mic hanging from the control tower line; especially leading up to the Kart nationals. not sure if this is what prompted the latest comments....

It not a right to expect to turn up and race.
If your machine doesn't meet the regs; you should do something about it beforehand, rather than waiting for someone to tell you too (if its loud in the shed then it will be loud on the track)..
If people are having issues on quietening their bikes down then ask. Plenty of people have managed to get their bikes quite, I'm sure people will be willing to help (especially to ensure that access to tracks are maintained).

Reving karts in pits... Mossy you are right they are fken loud... funny thing is every briefing they say there is an area to do this but its not enforced and its even in the rules G1.17.

[Kickaha]

I would have thought that all bikes need to conform to the NMZ noise limits

Only if they are MNZ permitted meetings, but it would make sense to do so for those that do meetings like the GP or BOB that are MNZ permitted anyway

[Grumph]

Only if they are MNZ permitted meetings, but it would make sense to do so for those that do meetings like the GP or BOB that are MNZ permitted anyway

All the kart tracks will be operating under a resource consent from the local council - which may well be a lower limit than MNZ....

Time I think for you guys to ask what the conditions of use are.

[Yow Ling]

When we race at levels the car club send a noise guy down, if you are noisy in practice you get warned to fix it now, if you are noisy in R1 you maight be told to put it on the trailer. Nothing motivates riders more than enforcment.

I guess it is a form of cheating really, if you find you can make more power by using a noisy pipe and a quiet one costs power then it was really an ill gotten gain, same as having a quiet pipe and 168cc

[richban]

Not just new bikes Rich.

True that. I have put a plug in the end of mine to reduce the noise. Not ideal. New pipe on the way. I have just purchased a big fat old Yoshi qaud bike muffler I am hoping to adapt for the bucket.

Surely a good place to start for people is a 95db rated dirt bike muffler. There are plenty of bargains out there.

[Shorty_925]

True that. I have put a plug in the end of mine to reduce the noise. Not ideal. New pipe on the way. I have just purchased a big fat old Yoshi qaud bike muffler I am hoping to adapt for the bucket.

Surely a good place to start for people is a 95db rated dirt bike muffler. There are plenty of bargains out there.

Quads up here that went on the track were well over the 100dB mark on the MNZ reader, hope youve made a small end cap!

[richban]

When I was playing with Megaphones I made this little shroud on the end of this monster. It was made a massive difference. Pity the pipe didn't work it looks cool.

Final version ended up with more holes and slots and yes it was welded on.

[richban]

Quads up here that went on the track were well over the 100dB mark on the MNZ reader, hope youve made a small end cap!

Its not a quad!

[fi5hy]

Might be as easy as pointing you exhaust end cap at the ground or finding another exhaust can that works. As for the karts warming up in the pits we can't stop that but when they rev them full tit they have to take them to the top car park which they do.