Loud Pipes? Quiet Pipes? - Page 3 - Kawasaki Ninja H2 Forum
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post #21 of 25 Old 01-31-2017, 11:51 PM
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Originally Posted by STRADALE View Post
I've never been too concerned with exact decibels so don't have an any idea of what the difference would be by looking at dB values/#.... I like a really loud exhaust. Brocks full system w/ the Alien Head 2 is Nirvana to me w/ it's sound level/ loudness & in it's tone.

So how noticeable would the difference be in the 2 exhausts below on the H2, in terms of how loud they would be in comparison? Thanks in advance for any help.

Exhaust 1 : Idle 106 dB / 115dB @ 5000 rpm
Vs.
Exhaust 2: 93 dB @ 4000 rpm
Its actually quite easy, every +/- 3.0 db is 2X or 1/2 as loud. So compared to ear splitting 115db, 112db is HALF as loud. And 109db is again half as loud as 112db and so on... 93db is considerably quieter. I have been wearing good 29db ear plugs for many years and just now having some hearing loss. At those sound levels I suggest everyone wear good earplugs.
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post #22 of 25 Old 02-01-2017, 03:19 AM
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A graph is always good to see how DB increased with increase

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post #23 of 25 Old 02-01-2017, 05:34 AM
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I had a Brock's CT on my 14R and it always passed the scrutineering noise test at LSR meetings. I agree, it's a shame there's no H2 equivalent.

As far as I know the only system for the H2 so far which has an effective noise reduction baffle is the Vandemon. The owner of the company was asking about our permitted noise levels and claimed to have a solution.

Akrapovic also claim their full system is quiet but I've not seen any dB figures.

Comment on Remal's diagram above: You need to remember that a 10dB increase is perceived as twice as loud. Decibels are not linear. The Loudness scale is missing from that diagram for some reason but for example: the motorcycle is 98dB and you might think that one measuring only 108dB isn't too bad but it's heard as being twice as loud.
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post #24 of 25 Old 02-01-2017, 08:18 AM
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As far as I know the only system for the H2 so far which has an effective noise reduction baffle is the Vandemon. The owner of the company was asking about our permitted noise levels and claimed to have a solution.
It's amazing what they've done. 119db all the way down to 93db with their insert. I have a batch of Gen 2 Vandemons on their way to me now. I gotta get one on the dyno to see how much hp is sacrificed if any.
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post #25 of 25 Old 02-01-2017, 12:30 PM
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As far as I know the only system for the H2 so far which has an effective noise reduction baffle is the Vandemon. The owner of the company was asking about our permitted noise levels and claimed to have a solution. Akrapovic also claim their full system is quiet but I've not seen any dB figures.
Yeah Bob I don’t have db #s either but I can tell you my Akrapovic system is REALY quiet. The guys I ride/race with on Sunday in the canyons tell me that they don’t hear me behind them or even going by, just see me shooting by. Also my pipe came with a db cutting baffle insert (pic below). The only time I can see needing to put this in is when I go ride Laguna Seca (which I am going to do this year!) because as most of you know they have db restrictions on that track to accommodate the local residents, but as quiet as my pipe is already I seriously doubt I'll need to put it in, but it's nice to have it in my tool box @Turbo329 good idea you have... my next dyno run I'll take the baffle insert and see how much hp it robs, probably not much I'm guessing.



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