DECIBELS CHART and what passes = 93 db

[SANDDEMON]

Here is a chart posted by the US Forest Service at the Winchester Bay Oregon staging area kiosk. Click on this link .
It shows what SILENCERS PASS,  MEET or FAIL in the ODNRA.

http://www.flickr.com/photos/30934429@N02/sets/72157624581583422/

click on a picture to enlarge

ORIGIN OF DATA;
HOW DID THEY DO THIS   =   SOUND CHECKS .  From what I read in the following link, "sound checks" made out on the dunes with actual motor/silencer combos. They list the number of units tested for some silencers.
http://www.fs.fed.us/r6/siuslaw/recreation/ohv/sound

[Sandflicker]

Great I'm adding to TI on Facebook - thanks Sanddemon! 

[SANDDEMON]

Pretty neat chart they posted. Are Sandrails next?   

[Senator]

I'm spreading this too

Thanks SANDDEMON

[woodsrider]

 So what were the sound levels off of. A four stroke, two stroke a quad or dirt bike.

[SANDDEMON]

woodsrider,
HOW THEY DID IT
 From what I read in the following link, "sound checks" made out on the dunes with actual motor/silencer combos. They list the number of units tested for some silencers. CLICK ON THIS LINK
http://www.fs.fed.us/r6/siuslaw/recreation/ohv/sound