WORCS in Phoenix

Quote:

---

Originally posted by Ex'r Marlin
The guy that did the testing said that last week for the motorcycles, there was only a couple of racers that exceeded the db level, but this week, a lot of quad exhausts exceeded the 101 db max.:confused:

One rider on a 450R was at 112 db's... Went and put in a baffle, and then registered 93 db's... Big difference.

I raced my 416 with a Yoshi pipe with no baffle or screen... 96 db's.:cool:

Question: Does anyone know what will happen if you fail the db level at Taft? I am willing to bet that some racers will race their first race of the season there, and will be greatly dissapointed if they come all the way to race, and then have to drive home without racing because they were a few db's over.

Best of luck to those that have to lower their db's for Taft.

---

LOL. I think my Yoshi on my 440 is the quietest pipe on the track these days LOL

We actually knew of a guy who failed his DB test on his Cdale last year at an event and had a drive back to Wash. It does happen and I heard he was NOT happy!

I wonder if the consistancy in testing will be accurate?? Ive read so many different things on the testing, most of which were not accurate. Lets hope thats not the case for WORCS series.

My husband and I both have HMF shorty's.......he said they told him he had the loudest pipe at 106.....I was at 104......we run open pipes with no baffles......we might see if HMF has a quiet core for ours....I'm sure that would help.....we can't buy new systems, that's for sure.....maybe stuff a t-shirt in there....hahahahaha

I sat and watched the guy doing the sound tests for the Pro Race as I shot photos of him testing the bikes and I will say this. He was consistent if nothing else in the process he did for the testing. He had them do the same thing over and over. He also retested a couple that failed, whether they passed or not can't say.

The only thing I wondered is halfway thru the testing he moved to a different location where it was closer to a wall. I am no expert or anything but just wondering if the echo off the wall has anything to do with the test.

Can you tell me if they tested the minis and how they done??

All I know is that here isnt much out there for minis and if they test too high then were out for sure...
I worry about our Stroker mini. It sounds alot louder but alot of it is now vibration the pipe really hasnt changed . My sons should be just fine .

I didn't get a chance to see the mini's, but from what I've been told the 2 stokes are actually quieter than than the 4 strokes. And they are all done the same no matter the bike size. You can get them tested locally, check your local shops but if nothing else call the Forest Service to see if you can get a test done.

I tested my Duncan racing Fat Boy 4 and it blew a 106db. I talked to Lenny Duncan about it and he said there was no way that could be right. This was a fairly new exhaust (less than 30 hrs.) with a turn down. Apparently there are a couple different factors that affect this test like rpm, angle of the meter, and any back ground noise. I am not sure if the meter was zeroed before the test or what exactly are the standards for the test. I am going to repack before Taft but I have checked California DMV site (GOOGLE "noise testing") and the highest db they had was a 97.4db for 2004 yfz with a fat boy 4 exhaust. Hope this doesnt cause everyone a problem we cant fix. Someone get some standards on testing up for us!

My Rossier blew 100 db.. Here are some tips.. Also here is a link..

http://www.ohv.parks.ca.gov/pages/11...287_199807.pdf
http://www.4strokes.com/tech/measure_exh_sound.pdf
the actual "SAE J1287" spec. is a document your supposed to buy, so I can't post it, but in a nutshell you test the sound at a 45 degree angle, 20" from the exhaust at about 3000 rpm (but it varies for different bikes).


and here are some tips to be sure its accurate................

1) Location : are you clear of any other sound influences such as objects, walls, or vehicles that can reflect or bounce sound waves back at you? Remember, 16’ is the rule!
2) Is your airbox modified? This can add to the sound level.
3) Are your levers and skid plate secure or rattling? The harmonics of loose components can increase the decibal rating and when it comes to sound — every little bit counts.
4) Are your buddies standing right next to you watching the test?
5) Is the exhaust outlet obstructed?
6) Is the sound equipment ANSI approved?
7) Has the sound equipment been calibrated prior to doing your test?
8 ) It the mic positioned at a 45° angle?
9) Is the mic closer than 20” to the exhaust?
10) Is the mic covered with a wind sock?
11) Is your bike at the right temperature?
12) Is your silencer packing properly maintained?
13) Are you being tested at the right Model Test RPM specification?
14) Have you asked for a second or third sound check?


If you fail at Taft you will be red tagged. You can still ride but will not be able to race any after Taft. You will have to fix the noise sooner or later.. All nationals are holding sound test and most races at a state level will be sooner than later.. People like to build housing developments next to our riding areas...

very good info "quadjeff". :cool: :cool: :cool:

anybody have the pro results both days

Josh Frederick won Pro motos on Sat and Sunday - Sunday's Pro main saw a finish of Josh Frederick, Doug Eichner, and then Logan Holladay......