Noise Emissions

[Freakshow]

what time is the next boat ? wil  you supply free sheep

[DJRacing]

We have 25,000,000 sheep Freaky, if ya cant find ya self one, ya dont deserve ta be here . ps Ya can always use the wool for muffler packing

pps, never come between a kiwi and his sheep

[evo550]

DJ,
This is how the test is to be done as per gcr's
Noise emmision must be measures with a microphone placed 500mm from the exhaust pipe at an angle of approx 45 degrees measured from the center line of the exhaust end, and at the height of the exhaust pipe, but at least 200mm from the ground.

The reading shall be taken with engine warmed up running steady at the specified revs and the bike in neutral.

The revs shall be measured using a calibrated tacho or a vibrating reed tacho held against any solid part of the machine.

Ambient sound within a 5 meter radius of machine should not be highter than 80 dba

other than the rider the sound testing operator and a person to hold the front of the machine there should be no person within 3 meters of the machine.

Sound test apparatus should be set on slow response.

Revs for test

85cc                        8000rpm
85 to 125                  7000rpm
126 to 250                5000rpm
251 to 500                4500rpm
over 500                   4000rpm

96 dba as of 1 jan next year.

[brent j]

DJ,

You'd better start freaky off on a level sheep. Takes a bit of pratice to handle left or right handed sheep. (Bred with uneven length legs for the sides of hills for those unfamilliar)

And being a kiwi I can make as many sheep jokes as I like. 

Brent

[T250K]

 DJ I like the sound of those hills and the natural terrain circuits,  .   Not so sure about the sheep  .  Which Island are you from ?   Cheers,   T250

[DJRacing]

Yeah I think I read that back on page 2 of this thread Evo550, but if the ambient sound within 5m of the motorbike cant be higher than 80db does that mean there is 2 db testing machines??

Or am I just being a smartass?

[DJRacing]

Hi Brent, how are ya going? I hope ya aint making to much noise or ya could get sent back home Hope ta see ya back over here for a ride some time soon. Ya should make it the final round of the series and we can catch up with a beer or 3. Freaky will be ok with a good set of velcro gloves .  T250K, I'm in the N.I. If ya take a look at the competition thread ya can see those natural terrian tracks and the Tasman sea in the back ground.

Sorry guys dont mean to take over the thread, I better shut up or I'll get booted for being to noisey

[Lozza]

You mean 'groupies'


Couldn't let that one pass now could I...............

[DJRacing]

Love the Kiss Lozza........... but I'm afraid I aint your kinda toothbrush

[fatboyracing]

Hi all,
Bikes at the junior Nationals htat are being held now in Qld are having there points taken off them if there bikes dont pass the noise test. Something to think about , this is going to be way more common next year.

Cheers
Fatboy

[Lozza]

A lot of talk about the 96 dB limit on the PCRA site, a sound engineer joined the debate and said that the noise test is bollocks.He describes it as us having a case for the EPA having to classify our machines as 'industrial'(because they are not registered and not designed for street use) hence making the test be performed at the boundary of the premesis.His analogy was that a race bike at the boundry of the race track would be no louder that a mower at your neighbours boundry. Also dirt mounds do absorb sound, not reflect it.Could be a bit of window dressing by MA as Eastern Creek and Broardford have 95dB limits......at 30m.A far more sensible test. councils and the EPA have the juristiction not MA.Probably open to challenge.

[Freakshow]

As of 1 January 2008, the noise limit for most disciplines of motorcycle competition will be 96db(A). The exceptions to this will be:


- Road Racing 102db(A)

- Historic Road Racing 102db(A)

- Speedway 98db(A)

- Track 98db(A)

- Minikhana 95db(A)

IM assuming we come under track ?   Otherwise why didnt the MX governing body Loby VMX to be treated as per Historic road racing ?   Where is the ruling on this mind field before we piss away a lot of money getting to Tassie and only getting half a grid passing scuitineering ?

[GD66]

 Wow, scary scenario there, Freaky. As I, DJ, TMBill and sundry others point out repeatedly, in NZ VMX they operate without the sanction of clubs or a national body, so this need never occur. If you are classified under "track", then you are right,vmx should be aligned with historic roadracing. However, the dreaded, and much-threatened noise meter is, in historic roadracing at least, seldom seen, but is always written into supp regs. Now I'll be buggered if I'm going to drag my little roadracer to Phillip Island, Mt Gambier, Broadford or anywhere else FROM PERTH, only to be sidelined by a noise dispute, so I have a pair of ready-made mufflers made that slip over the reverse-cone meggas, and knock the edge off the sound, so that if it ever occurs, I can keep racing. And I recommend that if you have noise concerns, you do the same. Even if your bolt-on extra muffler is hideous, heavy, uncool or whatever, at least you can be out there racing instead of arguing in the pits. Read and interpret the rules, and know them well, and you won't come unstuck. Still sucks though, of course....

[Freakshow]

Well how do you know your under 98 ? like were would you go to get the bike tested ? i dont think you can ? too late on the day, and every round would be a differant set up so how can we ensure that a bike is eligible to raCE OR CAN THERE be a supp reg written into the NAtional event that has an exclusion to run to 102 DB ? surely the promoters can do that for each event as they see fit ?

[DJRacing]

When I finish building the bike that I want to take to CD-5 I'm going to have a party(very loud music) and my neighbors will call 'noise control' and they will come out to my place with a 'db' meter and I will quickly turn the music down and then start up the bike and keep it reving at 7000rpm, that way I will get it tested for free. hopefully I should still have a bike because they have to give ya a warning first before they can confiscate it 

Now you say 80db at 5 metres away didnt you??