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Old 08-30-2010, 03:23 PM   #41
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Quote:
Originally Posted by DrAwkwArD View Post
I don't know where you're getting your numbers but average human speaking is produced somewhere between 55-70dB. Also, 90dB isn't twice as loud as 85dB, it's like 3.16 times as loud. 88dB is twice as loud as 85dB. The power factor is 10^(x/10) which is roughly two (x=dB increase). The problem with threads like these are the people posting in them don't have any idea about acoustics.

If the sound level outside of a car at 70mph is 90dB (which I am sure it is more) and the motorcycle exhaust is 105dB, then the motorcycle exhuast is 31.6 times louder (10^(15/10). Even with sound reducing materials in the car (which are a set reducing number of decibels) the motorcycle exhaust is still MUCH louder than the interior of the car.

The exhaust sound level measurement at a stand still is the same for the motorcycle when it is moving. For instance, if you measure your exhaust 20feet in front of your motorcycle at a stand still and it is 98dB at cruising RPM, it will be 98dB when you are moving too and will increase as you get closer to the car you are overtaking.

Fact is, a person inside a car can absolutely hear the motorcycle with louder pipes much sooner than a motorcycle with quieter pipes. There is no refuting that.

Whether or not it saves lives is up to each individual and their personal experiences. I know for a fact I am heard much sooner on my streetfighter with open exhaust than I am on my 1125R with the stock exhaust. That said, I don't rely on that. Don't ride with your head up your and you'll be much better off with any set of pipes on your motorcycle...loud or quiet.
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Originally Posted by Mr. Unassailable View Post
note, before you argue with this... look up my name in a dictionary, and ask someone what I do for my 9-5.

IDK if it was already addressed, but...

6 db = 2X sound.

so 70 DB is 1/2 as loud as 76 DB,
96DB is twice as loud as 90 DB,
and so on.

Constant sound levels over 90DB can cause hearing damage

So... if you car is over 90DB, I hope you are wearing hearing protection. and if you think a 100 DB bike is not much louder than your 90DB car... It is more than twice as loud as the interior of your car.


Now for some other facts...


Kawasaki Vulcan 1500
"Sound levels were tested at the AMA standard of 20 inches at 45-degree angle from the pipe opening with the sound meter facing away from the pipe and the engine at a constant 3000 rpm. The drive-by sound test was taken at a distance of 12 feet with the Classic driving by at a constant 45 mph in second gear, which translates to about 3000 rpm in the real world."

Stock System
Sound level at 20 in.: 92 db

Cobra
Sound level at 20 in.: 103 db


Now consider pulling the baffles.. how much louder is it now?






I dont like loud pipes, but I can agree that they do save lives. They *can be* loud enough for dumb that dont pay attention to hear. And if I wanted people to know where I was in traffic, I would have them on everything.

Additionally, this tidbit was also to show how skewed #s can look. They used #s from 80~ to 100~ to make you think its more like a percentage. They left out the fact that 20DB = ~10X sound level.

80DB = 100%
86DB = 200%
92DB = 400%
98DB = 800%
and so on.

So dont be fooled by people that play with numbers to make look in their favor.

who wrote that ? Obama or Ross Pero?(spelling on Pero is questionable)
look at OSHA 1910.95(b)(2) pasted below
http://www.osha.gov/pls/oshaweb/owad...ards&p_id=9735

they allow 90dB for 8 hours or 95dB for 4 hours, 100dB for 2 hours. That in itsself shows that the sound doubles for every 5 dB. or at least that is what is enforceable per OSHA for my line of work
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Last edited by sbfuller; 08-30-2010 at 03:26 PM.
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Old 08-30-2010, 03:23 PM   #42
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Originally Posted by Mr. Unassailable View Post
SPL is sound pressure level, its a mechanical way of measuring sound.

the 6db doubling is best fit for the application in question.


lastly,

F U Racer X(where ever you are)
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Old 08-30-2010, 03:24 PM   #43
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Old 08-30-2010, 03:25 PM   #44
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Originally Posted by sbfuller View Post
look at OSHA 1910.95(b)(2) pasted below
http://www.osha.gov/pls/oshaweb/owad...ards&p_id=9735

they allow 90dB for 8 hours or 95dB for 4 hours, 100dB for 2 hours. That in itsself shows that the sound doubles for every 5 dB.
You think they know what they are saying? lol. atleast they are close to the right answer.
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Old 08-30-2010, 03:27 PM   #45
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You think they know what they are saying? lol. atleast they are close to the right answer.
true, true... but at least that is what is written in law and is enforceable in my line of work
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Old 08-30-2010, 03:28 PM   #46
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true, true... but at least that is what is written in law and is enforceable in my line of work
I didnt know they enforced stuff like that in gay .

(ok, i'm done)
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Old 08-30-2010, 03:34 PM   #47
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Quote:
Originally Posted by Mr. Unassailable View Post
F U Racer X(where ever you are)


Good one Clayton



The point here is defensive riding will be far more effective at saving your hide. Ride with the assumption that no one can see you, and you're far more likely to make it home in one piece.
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Old 08-30-2010, 03:34 PM   #48
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Sound levels increase 4db for every inch inserted, at least in my bedroom. Just sayin. It gets LOUD. Cars hear us .
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Old 08-30-2010, 03:35 PM   #49
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Sound levels increase 4db for every inch inserted, at least in my bedroom. Just sayin. It gets LOUD. Cars hear us .
YOu're saying only 8 db then?
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Old 08-30-2010, 03:37 PM   #50
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YOu're saying only 8 db then?
8.4 db..... @ 2543hz
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Old 08-30-2010, 03:38 PM   #51
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8.4 db..... @ 2543hz
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Old 08-30-2010, 03:45 PM   #52
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just looked at one of my college textbooks... if you have a single sound source of 90dB, and you put another 90dB source right next to it, the sound measured will go up by 3dB. If you have that same 90dB source measured at 6 feet, the sound will increase by 6dB in you get halfway closer, or decrease by 6dB as you step back to 12 feet. the 5dB that i referred to is a time weighted scale on which OSHA will allow you to be exposed to a sound level without suffering permanant hearing loss. the time is cut in half for every 5 dB increase above 90dB.

, it, it's monday and i don't want to think anymore!! LOL
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Old 08-30-2010, 03:50 PM   #53
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Good one Clayton



The point here is defensive riding will be far more effective at saving your hide. Ride with the assumption that no one can see you, and you're far more likely to make it home in one piece.
i just prefer to ride/drive faster than everyone else drives, only worry about whats in front of you, F whats behind you.

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Old 08-30-2010, 03:52 PM   #54
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Old 08-30-2010, 03:59 PM   #55
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Originally Posted by Badzx14r View Post
THEY CAN'T HEAR TRAIN HORNS or 18 wheeler air horns either ..so i think the problem is whats going on inside the cars ..not whats happening on the outside
Loud pipes are not a cure for STUPIDITY!!! Stupid people are still gonna try to run you over! Thats what i tell people when they say "well trains have loud horns and people still crash into them". With that being said, loud pipes or not - you have to be on your toes riding on Houston streets! Ive tried honking at people for coming into my lane and ive also rapped my throttle with loud pipes....and in my experiences, THE LOUD PIPES GET THE OTHER DRIVERS ATTENTION! AND YES I HAVE THEM BECAUSE THEY SOUND GREAT!!! And i agree, sometimes it is whats going on inside (putting on makeup, phones, eating and just plain not paying attention).

Last edited by icecreaman; 08-30-2010 at 04:02 PM. Reason: forgot something to say
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Old 08-30-2010, 04:03 PM   #57
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Loud pipes DO HELP get noticed by others on the road. No it's not a failsafe. You can bring out all the sound eveidence you want but they do help.

I don't know how many times someone was merging into my lane and didn't hear my horn. But they sure as heard my exhaust when i bounced it off the rev limiter real quick. I know i've heard bikes in my blind spot and couldn't see them while i'm in my truck.

Bottom line, no question, louder pipes do save lives.
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Old 08-30-2010, 04:06 PM   #58
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Loud pipes DO HELP get noticed by others on the road. No it's not a failsafe. You can bring out all the sound eveidence you want but they do help.

I don't know how many times someone was merging into my lane and didn't hear my horn. But they sure as heard my exhaust when i bounced it off the rev limiter real quick. I know i've heard bikes in my blind spot and couldn't see them while i'm in my truck.

Bottom line, no question, louder pipes do save lives.
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Old 08-30-2010, 04:40 PM   #59
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Quote:
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Good one Clayton



The point here is defensive riding will be far more effective at saving your hide. Ride with the assumption that no one can see you, and you're far more likely to make it home in one piece.
Thats pretty much what I said on page 1.

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I think good habits like 1. being aware of the cars around you and 2. knowing where to be at the right time (lane wise) could help as much as loud pipes.
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Old 08-30-2010, 05:11 PM   #60
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