SpeedyManiac said:I know that lower frequency sounds carry farther, but I'm addressing a very specific issue that in terms of absolute sound pressure levels, using the dBA scale gives four-strokes a slight advantage, and if they went to using the dBC scale, it would level the playing field, so to speak.
thorman75 said:I remember years back something about noise and the AMA, Wardy was involved and 1 test involved a stock CR500 Honda.If you know CR500's the stock silencer is 2 stage and huge, but the bike still failed the noise test. The culprit was from air rushing into the intake/airbox. Go figure.
i'm sure Ger remembers
SpeedyManiac said:Thanks for the explanation Tony. I'm relatively new to acoustics stuff, I just thought I found something of interest that could maybe help keep riding areas open. I'll post the charts as soon as I get copies from my prof.
Gee since you didn't specify that the discussions could only go in the direction you specifically wanted them to I sort of figured the dynamic flow of the posts was what made DRN, DRN. Next time post up about 12 pages of small print being specific in what you demand in any replys :laugh:SpeedyManiac said:Did any of you guys actually read and understand my original post? Or am I just talking to myself?
Loud pipes save lives.
thorman75 said:If you want real noise, try standing next to a 175 Howitzer, although I guess the navy's guns are louder yet as they're bigger.
Racesmith said:I can't believe I read this whole thread...I should receive my acoustics degree in two to three weeks right???
Philip said:That's not really fair Patman. I ride a HD which is posted somewhere on here and a CRF450. The 450 is louder than the HD, so are you saying that I am trying to draw attention to myself when on the track. If you knew me you would know I putt around and never, on either bike, need to draw attention to myself. I am sure you don't mean all HD people are this way just the ones you work with. :p
If its got two wheels I like to ride it. It is great time spent together with my son and the best stress relief you can find. When was the last time you saw a Harley parked in front of a Pschiatrist (sp?) office. :laugh:
Busted :laugh: .....NOT! The idea has never even crossed my mind, honestly!bsmith said:Patman is jealous he doesn't have a Harley,...
RYDMOTO said:The one thing to understand is low frequencies do travel further than higher frequencies.It's interesting to note that elephant calls are in the sub-frequencies and their call can be heard 20 miles away.And those same sounds can carry thru vegatation as those sound waves are in the 20 foot range.Not sure how low our four strokes go so there should be a concern that way.
Do you ride on the street? And I'm not talking about a gravel road, more like 80/94 Borman Expressway at around 4pm on a weekday. Then and only then could you make an honest accessment.BadgerMan said:One of the dumbest quotes ever......... :|
DougRoost said:I had the same reaction since I hadn't thought of that. The 250f's at SX sound like a bunch of farts to me :)
kmccune said:OK I know I'm contributing to the hijacking of this thread, but I couldn't pass this one up. That is exactly what I think they sound like too. It make my wife angry when I say it because she says that they sound mean or tuff...yup just like a fart :laugh:
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