WHY CANT VMX BE 96DB???

[Hoony]

FBC,

just as a matter of intereset what was the 07 KTM that tested at 87.4?

250 2/4 stroke , 450 4 stroke ?

[Freakshow]

I think the message is getting throuogh 102 is the go, dont think for one moment that we all wont try to be a low on the reading as possible, i will repack where i can but having a target threshold at 102db, can allow some movement in the range.  If we get the nod 102 is ok, if we personally shoot for under it we would be doing all classic racing a favour ( so we dont standf out as loud ) and also we have room to move if  for example you go all the way to tassie, if you left under 100db, but found your at 102db on the day no love lost, but if you left on 96 got there on 98db rightly youo could be told to pack up or be protested out, unlikely but possible.

I think you guys have it well under controll in the MA stakes, give us 102 and we will do our best to honour it in the spirit it was given back, be as quiet as we can and target to be under it as a volantary code of conduct.

[Rosco400]

Question, how can you test your DB in your own backyard, any meters you could buy from Dick Smiths, and electronic gurus on the forum want to teach us how to make our own or any links on the web anybody knows of that will give this info, curiosity is now getting the better of me

[Freakshow]

its not only the meter you need but morso the RPMs, you will need to either hook up a digital pulse tacho like a kart one or a vibration wheel so you can get to your CC's and configs RPM test  block - say its 5-6,000RPM. 

The meter is only half the challenge, you need to know your holding it in the right rev range for the readings to mean anything anyway.  The sound pulse changes rapidly in the RPM range from loud to almost equal, if you can find your chambers "sweet spot" and if its in your tested RPM, you may be able to dial into that spot during your test and be at barely a puff.

I think any noise meter even the cheap ones would give you a fair idea, set up as per MOS book shows you everything there as far as angles.

Also where your bike holder stands can also change the Db by 1-2, note that one if you need to cut a DB at scruineering, there are tricks to play but at 102 we shouldnt have to resort to that sort of nonsense 

[firko]

Has everybody sent their protest letter to MA regarding the draconian 96db sound levels yet? Without your lobbying nothing will change and we'll be stuck with 96db. It's no good whingeing afterwards so do it now. Send your protest emails to Ross Martin at [email protected] . For those who haven't worked it out yet, Ross is Rosmar off this forum.