What is the mechanism? Is there something in the MoMS that informs of proposed rule changes? What is the avenue for doing something about amendments that we may be opposed to?
What was the MA meeting that everyone is referring to, and how much of an opportunity was there to really make a difference?
If as I was led to believe our (elected?) representatives like Mark and David and so on were working behind the scenes, surely they speak for a lot more than the 25 who did write in? Why does there need to be some huge active swell of dissent? Isn't there a formal avenue or process whereby the wishes of the majority are represented? Is the way that MA works that they do what they like unless everyone in Australia forms a lynch mob and hangs them from the nearest post?
We need some discussion on what we need to do to get our bikes under the limit.
For example:
Long aluminium silencers are better than steel or carbon fibre.
The stinger can be extended back into the body of the 2stroke expansion chamber.
Supertrap silencer rings can be added to the end of the alloy silencer to take the bite out of the sound.
Rubber plugs between the cylinder and head fins can take out the ringing.
Countershaft sprockets with the rubber lips to cushion the chain can reduce chain noise.
Thick rubber blocks inside the countershaft sprocket cover.
Can we wrap the exhaust pipe in something?
Should we be getting GMC to make us thicker walled pipes?
What other suggestions do you guys have?
Even this law seems to support the idea that a Pre 1985 motorcycle is not expected to meet a 96dB limit.
As none of us are privvy to what goes on behind closed doors at MA, where would one go to find out who was the governing body who made the decision to apply the 96db rule and on what basis it was made,Yes pls!!!
Most ma reps or members at that level firko are old timers paid workers, these retired riders mostly come from the good ol days of road racing, so thats where the slant will come form without doubt.
Most other folk equate mx to modern bikes, and would have picked up that to ride a MX on the road the complience plate sits the level at 96DB, they didnt have to think about that one to much, many wouldnt think old mX still exsist thus road racers are the most common denominator there.
They are just voting for themselves, and thats what they did. I noticed AMA have pushed DB back out to 98/100 with a penalty system, not a no run policy, so it will be interesting to see if we stay or drift back out as they have.
6. 96dbA is here to stay and it is here to stay for the good of our sport generally, not to annoy a minority of CMX whingers who do not want to make changes or move into the 21st century.
Let's all move forward for the good of Motorcycling.
5. Road Racing generally, including Historic Road Racing has received a higher decibel reading because they race on established tracks that constantly monitor the noise of all competitors. Go to Eastern Creek and look at the Noise Meter that runs, and is monitored all the time vehicles are on the track.
3:So, if I read it right, because road racers ride on a pre determined track they are allowed an extra 6db to play with. What is Barrabool, Broadford, Ravenswood etc, cow paddocks? I would have assumed that because of the comparitive isolation of two of those tracks and the close proximity to the ajacent road course for Broadford that a 102db would be acceptible. Your, or MAs reasoning, makes no sense.
a minority of CMX whingers who do not want to make changes or move into the 21st century.
A few observations taken from the last few posts.
1: Freakys posts are usually all over the place, ill informed and poorly written. We don't bother trying to correct him as he usually goes off on a rabid blast about old school wankers daring to question his unique slant on the sport. As a newbie, you fell right into his trap Mr Bored.
The world is full of old bastards who can't get their heads out of their arses.
As for persian cat fanciers, you name it. It's a peculiar thing. A generalising stereotype, sure, but true.
Nathan, Nathan, Nathan. Things have been going along so agreeably and then you come along and ruin it all with a silly statement. The following ......."How about looking at things in more general terms: More MX tracks are near houses than road race circuits. The road race circuits usually have far more significant/effective noise-abatement measures".......indicates that you may need to visit a few more venues. Eastern Creek is in the middle of suburbia, Oran Park is very close to Harrington Park and Cobbity rural communities, Calder is surrounded by suburban sprawl and many other road race circuits live within a cooee of housing. On the other hand, the tracks that Oldy mentioned, Ravrenswood is in a rural setting miles from housing, Barrabool is also miles from housing and on the NSW scene Clarence is miles from Lithgow and housing, Rockley is in Bum F#*K, Nowhere (Sorry Ribbo), Barleigh Ranch is miles rom the nearest house and Crawford River is also in a remote rural setting. Noise abatement isn't a major issue at those venues yet but it would be easily handled if implemented as at the road circuits. There is no reason that 102 db would be a problem at those circuits :-*:-*
The YZ80 muffler is 12" x 3" twice the size of the stock one and it didnt pass ???.What is the core size of this muffler Hilly? If you have used something from a bigger bike to get a longer muffler it will have a bigger core size that will let more noise out even though it is longer as well as not running right because it has changed the back pressure.
The RPM that the test is done at is interesting...
up to 85cc 8000 rpm
85cc to 125cc 7000 rpm
125cc to 250cc 5000 rpm
251cc to 500cc 4500 rpm
over 500cc 4000 rpm
What would a BSA or Triumph normally rev to?
& what were these limits based on?
4500 RPM for an open class bike.
A TT500 would maybe be at 3/4 throttle where as a CRF450 would be at 1/2 or 1/3 throttle.
A CZ 360 or Maico 350 would also be at 3/4 throttle??
125cc to 250cc 5000 rpm
How high would a MX 250 rev, or an Elsinore 250? They would also be around 3/4 throttle compared to a YZF250 being around 1/2 or 1/3 throttle
And the 250 f's run with the 125's so are they measured as 125's or 250's???????
So instead of chasing lower decibels for the older bikes maybe we should be pushing for the readings to be taken at a lower RPM.
This lets MA brag they have lowered the noise limits to keep the greenies happy & in effect it would make the levels more achievable for the older bikes.
I agree with 414 - where are you Geoff??? My 250 Elsinore has a GMC pipe with something like an 18inch silencer packed to the max and should be OK - my YZ360 on the other hand has a bloody 3 inch pickle!!!!! Geoff - what ya got for my 360 mate!
;D
Rossco
Do the bikes have to meet the test before a race & after a race or just at scutineering???
If these 300 long mufflers are enough to make the new limit then it won't be that hard to achieve but if not then I'm not sure what else as I can't make these mufflers any longer as they would ported past the back wheel which is another no-no.
Hi Guys,
Just got back from Testing modern bikes in Penguin at the first round of the Australian Motocross Champs
tested 75 on Saturday and all passed easy
remember that the reading only needs to be 98.9 with a type 2 meter
most of the factory bikes came in around 93 to 95 not much over. They are also careful not to be too close before the race because after a 30 min moto the pipe gains about three quarter to a full db in noise,and in the races 1st, 2nd and 3rd were tested after racing.
Most of the factory bikes were tested sometimes 5 times playing around with end caps etc. perhaps thats were we should be looking.
I also will be helping Derek Rumble test at CD5
Cheers
Fatboy
Does anyone reading this know what the limit is now for "Classic" road race-A TZ700 or open megaphone CB900 for example would blow the DB reader apart!
Congratulations must go to Freaky, very restrained through all this, the new medications working well then? ;)
Nice on rosco, thats a clever little device if it works. Couldnt be hard to make somthing similar.Best that only one of us buys it and tests it first. I am sceptical.
The record on the day was 116db by some Suzuki :o Would have been a 125S I'm guessing as they are pretty raspy when on the pipe. The little TM ran out at 100db on the nose so I was pretty impressed with that..won't take much to get it down from there :)The bike that got that 116db reading was an old DR-500 with a hot dog muffler. :-X
Mmmmm big bore and stroked Yamahas another gorgeously sweet sound!!!!!!!!!!! only 108! better cut the shitty mufflers off Walter and try again :)
I think Jonseys Black Betty came in around 102 and it hasn't got a muffler at all!
a motorcycle with a deep "clean" note will have the energy level discounted in the test, but a motorcycle with higher frequencies in the exhaust note may not only fail the test, be also be "annoying'. Here we have the reason why "trail bike noise" is marked for attention by authorities, yet ordinary street registered machines mostly pass unnoticed by the general population
Oh not Decibels for Xmas ::) , please bring back the Suzuki Footpegs instead :D