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post #1 of (permalink) Old 08-22-2002, 12:45 PM Thread Starter
 
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how to quiet a K&N filter?

I think it was Pug said it best - 'sounds like a tug-boat'. the 240diesel w/ underhood K&N gets a serious resonant drone doing 4500-5000 rpm on the shifts. Can anyone whos played with K&N style fitlers/intakes comment on the relative noise levels of open K&N,VS K&N with a foam pre-filter wrap, or would I be better off just running a snorkel, and getting the 'source' of the noise out from under the hood? ( or is the tubing for the snorkle just as loud?)

chris
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post #2 of (permalink) Old 08-22-2002, 05:18 PM
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Re: how to quiet a K&N fitler?

I understand what you are going through , but there isn't much of a cure . The only thing a tube added on will do is amplify it more . The best way to shut it up is to create a large airbox it can get it's volume of air from , much like the stock air filters and boxes on newer diesels . I want someone to explain to me how some of the newer heavy equipment I work around is so quiet , especially LeBehr and Duetsch . Their engines never sound like they ever hit a strain , and yet they have incredible power , and no hint of smoke , ever .
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post #3 of (permalink) Old 08-22-2002, 05:36 PM Thread Starter
 
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Re: how to quiet a K&N fitler?

thanks sarge. I hand some tiem free today, and looked into some of the new setups. It appears that those 'boxes' are actually layers of acoustic damping / plastic shell..IE, they're masking the noise, not getting around it. I've also listened to the Niva while a friend drove it down the block, and its considerably quieter outside than in ( meaning its a resonance, not just a 'noise'.)

with a 30" long hood, and future plans calling for a turbo, and intercooler, I dont have room for a huge airbox...right now I'm thinking of experimenting with a lined tube (to damp out the resonance), and a roof height snorkle, to move the noise outside the body: any suggestions or thoughts before I start cutting holes in my body shell ?

chris
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post #4 of (permalink) Old 08-22-2002, 05:43 PM
 
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Re: how to quiet a K&N fitler?

Hey Chris-

I hadnt seen you around in awhile and thought you may have wandered off hehehehe. Hows those projects coming along?

shawn
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post #5 of (permalink) Old 08-22-2002, 05:47 PM
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Re: how to quiet a K&N fitler?

Yes , actually . You may just need to "tune" the noise out . It should be the same principle as speaker boxes , in that they have to be tuned to the amount of air movement for a given resonance . If perhaps you went with a larger or smaller diameter tube , even perhaps insulated on the OUTSIDE . This may relieve some of that drone that diesels are famous for . Usually , the larger the tube , the lower the frequency . If you get it low enough to match the engine's own resonance , they can actually cancel each other out . Some auto makers even experimented with this years ago , using a seperate speaker system to cancel out engine and road noise . Also , some insulation blanket under the hood and maybe even in the fender wells can help a lot , since those panels do nothing more than act like a reverberating drum .
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post #6 of (permalink) Old 08-22-2002, 06:35 PM Thread Starter
 
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Re: how to quiet a K&N fitler?

Hi Shawn, actually, I'm taking the Zen approach to my zuk projects: the shortest distance between 2 points is a straight line....in the opposite direction 8^D

I DID manage to confirm that the Nissan 720/Zuk case combo is feasible, but only for vehicles with 7"+ of lift. even then, I'd question whether or not you want to lose the clearance the double case setup would cost you. the divorced Toy setup is coming, but I've been just too darn busy to work on the Zuk much. (I'm building up the whole truck, as we'd discussed before) right now w/ parts everywhere, my back yard looks like a bad episode of junkyard wars 8^P

chris
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