Author Topic: K&N vs Foam Filter (Read 2128 times)

Cunningham_821 · « **on:** September 23, 2012, 08:19:48 pm »

so i smashed in my k&n a little with my wheelie bar mount now im looking for a diffrent air filter setup. im running a stock boot with a sblt adapter foam filter would give a little it it hits bar mount was just wondering about diffrence in flow. what are ure thoughts im running a 7" long k&n now thanks.

Cunningham_821 · « **Reply #1 on:** September 23, 2012, 08:23:38 pm »

a k&n like i have with a like 30degree angle would prob work even.

Rogue1970 · « **Reply #2 on:** September 23, 2012, 10:12:41 pm »

For your racing, the K&N (gauze) style would work fine. For running in the sand, the gauze style doesn't filter the fine dust (or even the small sand particles).

The Uni Dual Layer is a great filter for sand dunes. I was running a 4x8 monster on there, but dropped down to a 4x6 as it doesn't flop around as much with no rear support.

So in short, the K&N should be fine for your runs..... especially since it looks like your in the lead most of the time

Cunningham_821 · « **Reply #3 on:** September 24, 2012, 07:50:56 am »

yea but what im saying is if i go foam it wont hurt it if it hits the bar mount. but i dont wanna sacrafice performance at all.

PCS · « **Reply #4 on:** September 24, 2012, 08:47:52 pm »

k/n with an outerware. foams dont flow as well cotton gauze, i would try to stuff the largest one you can to get longer ride time.

Glamisrider · « **Reply #5 on:** September 25, 2012, 12:58:17 pm »

Here is the filter & outerwears you want to run for just about anything but Mud:

AEM Brute Force with internal supports Dryflow #: 21-2059BF
http://www.aemintakes.com/store/product.aspx?Prod=21-2059BF

If you wan to run a different filter here is the link to all of their universal dryflow filters (get a brute force (BF) with the internal support)
http://www.aemintakes.com/search/univcone.aspx

Outerwears #:20-2108 = 5.5 x 6.5 x 12
Call Ron Griffen West Coast Distributor $16.50
Auto Parts Unlimited
Tel:(909)597-8638

This set up works the best so far, no oil and only passes a very fine dust no actual sand granuals

DMoneyAllstar · « **Reply #6 on:** October 02, 2012, 07:08:50 am »

Run that K&N for a while (with or without Outerwear) and you will begin to see some blemishing on the OD of your piston! That's WEAR. And when you look inside your reed block, you'll start to see some fine dust.

K&N is made for flow...that's it. They beat the "ping-pong-ball flow test" with flying colors, but they don't stop dirt & dust (not efficient). If you met the people from K&N, you'd know they were about making filters that FLOW and making gos of money to pay for their motorhead hobbies. Nice people, though!

On the dunes and trail, use the dual-layer UNI and wash it regularly.

Dezsled · « **Reply #7 on:** October 02, 2012, 08:14:58 am »

I have had great service with k&n filters. Using the red spray on oil and an outer ware, never had any dust get past.

Could under oiling the filter be a cause?

Rider414 · « **Reply #8 on:** October 02, 2012, 10:21:22 am »

I agree with Dez. I have run K&N filters on everything and have never had a problem with infiltration.

My last check was the wife's Wolverine 450. We got it in 2006, I tossed the stock filter and drill holes in the airbox lid. In 2011 I rebuilt it when a valve was starting to leak. The cylinder and piston looked brand new! This quad sees alot of Michigan sandy trails and dust.

Just my 2 cents.

ATVMXR · « **Reply #9 on:** October 02, 2012, 12:26:11 pm »

Quote from: Glamisrider on September 25, 2012, 12:58:17 pm

Here is the filter & outerwears you want to run for just about anything but Mud:

AEM Brute Force with internal supports Dryflow #: 21-2059BF
http://www.aemintakes.com/store/product.aspx?Prod=21-2059BF

If you wan to run a different filter here is the link to all of their universal dryflow filters (get a brute force (BF) with the internal support)
http://www.aemintakes.com/search/univcone.aspx

Outerwears #:20-2108 = 5.5 x 6.5 x 12
Call Ron Griffen West Coast Distributor $16.50
Auto Parts Unlimited
Tel:(909)597-8638

This set up works the best so far, no oil and only passes a very fine dust no actual sand granuals

I thought Brett had horrible results when he tried using a dry flow filter in the dunes....

Cunningham_821 · « **Reply #10 on:** October 02, 2012, 12:34:46 pm »

glamis rider is brett i believe...

Rogue1970 · « **Reply #11 on:** October 02, 2012, 12:43:36 pm »

Quote from: atvmxr on October 02, 2012, 12:26:11 pm

Quote from: Glamisrider on September 25, 2012, 12:58:17 pm
Here is the filter & outerwears you want to run for just about anything but Mud:

AEM Brute Force with internal supports Dryflow #: 21-2059BF
http://www.aemintakes.com/store/product.aspx?Prod=21-2059BF

If you wan to run a different filter here is the link to all of their universal dryflow filters (get a brute force (BF) with the internal support)
http://www.aemintakes.com/search/univcone.aspx

Outerwears #:20-2108 = 5.5 x 6.5 x 12
Call Ron Griffen West Coast Distributor $16.50
Auto Parts Unlimited
Tel:(909)597-8638

This set up works the best so far, no oil and only passes a very fine dust no actual sand granuals

I thought Brett had horrible results when he tried using a dry flow filter in the dunes....

As far as I remember, Brett along with others had great results using the BF dry filter. I on the other hand had sand/dust in the intake track after one ride using the Amsoil "Nano" dry filter.

Cunningham_821 · « **Reply #12 on:** October 02, 2012, 06:37:40 pm »

this is a track only bike im not the least bit worried about dirt im wondering on flo ive been told by a few ppl that a foam filter flows better than k&n i think its bs tho.

MotorGeek - Jerry Hall · « **Reply #13 on:** October 03, 2012, 08:17:23 am »

Size does matter or said another way; surface area does matter. A pleated filter of the same diameter and length will have more surface area than a foam filter having the same dimensions. I always try to fit as large of a filter that space available will accommodate. Excessively large K&N filters will allow, "over oiling" to improve filtering action without out hurting airflow to the engine. Excessively large filters will reduce the pressure difference from the inside to the outside of the filter, reducing the small particles being sucked through the pleated gauze. Excessively large air filters will increase the run time between cleanings.

K & N filters have larger holes in their gauze fabric that catches the dirt than paper filters. This is one of the reasons that they flow better than a pleated paper filter of the same size.

Foam filters collect dirt on the inside walls of the little oil-coated tunnels where air goes through. Dirt will pass through a foam filter once all of the little tunnels have dirt stuck to their walls and there are not any sticky surfaces inside the filter.

There are positives and negatives to every type of air filter.

I do not like the K&N imitations that use the synthetic gauze instead of the cotton gauze that K&N uses. Filter oil will not soak into the synthetic gauze. Ina short time, filter oil drains to the bottom of the filter leaving the top of the filter dry on filters that use the synthetic gauze.

The filtering action of the K&N filter is drastically reduced through improper cleaning. I would estimate that this happens the first time the filter is serviced for about 75% of the owners of K&N filters.

Pipe-Ster · « **Reply #14 on:** October 03, 2012, 08:49:14 am »

"so i smashed in my k&n a little with my wheelie bar mount now im looking for a diffrent air filter setup. im running a stock boot with a sblt adapter foam filter would give a little it it hits bar mount was just wondering about diffrence in flow. what are ure thoughts im running a 7" long k&n now thanks."

Only the dyno will tell. If you don't have access to a dyno I would use the largest K&N that will fit and get it 10" away from the slide. K&N are the industries standard for a reason.

Q2W · « **Reply #15 on:** November 07, 2012, 10:32:40 am »

Ran the AEM Brute force this past weekend and it made a big difference. Went from a 6" cone Uni to the 9" AEM. No sand and the bike breathed much better. Still a tad rich but ran great.

El Diablo · « **Reply #16 on:** November 08, 2012, 11:05:25 am »

I took my Spectre air filter off to inspect the intake tract. Even with my mishap & all the sand I was eating, there was NOTHING in my intake or carburetor. No sand, no dust! Not bad for a $38 filter with no outter wear.

Dirtzilla · « **Reply #17 on:** November 08, 2012, 08:35:24 pm »

roughly how many hours of riding do you think you put on that filter that weekend El Diablo

El Diablo · « **Reply #18 on:** November 09, 2012, 12:19:33 pm »

Between my short riding time this weekend at Glamis & 2 days at Gordons Well, I have between 10-12 hours on this filter. Probably not enough to make an accurate assesment, but it's better than the smaller K&N filter & intake tube that I got from Trinity Racing.

OneFastLT500R · « **Reply #19 on:** November 10, 2012, 07:01:50 pm »

I built this off of a conversation Jerry Hall and I had .... It helps I own a CNC machine shop so the flange was easy and I just tryed to stuff the biggest filter I could in there .... As Jerry said the Bigger the Better on the filter ....

Buckeye513 · « **Reply #20 on:** January 29, 2013, 08:25:45 am »

What size k&n can you run if you're keeping the air box? Can you modify the air box to run bigger filters? I work in hvac and Jerry is 100% correct as far as air flow goes pleated and size are the best bet larger surface area means better flow rate.

Q2W · « **Reply #21 on:** January 29, 2013, 08:52:23 am »

6" is about as big as you can get in the stock air box. But you should seriously think about eliminating that thing. Unless you mud ride your zilla.

Mitch Keller · « **Reply #22 on:** January 29, 2013, 09:05:37 am »

Yes you want to go to a 8" or 9" filter, Here is a link on some filters
http://www.suzukiquadracerhq.com/carburetor-jetting/who-says-size-doesn%27t-matter-lt500-air-filter-wise/

Buckeye513 · « **Reply #23 on:** January 29, 2013, 10:12:17 am »

Is anyone still making those adapter brackets? Also couldn't I put my airbox back on when I gonna be muddy trail riding, cause I do plan on doing that in the bikes life with me. Would I need to run outerwears with the k&n? I'm not going duning since there aren't any dunes in Ohio an if I go duning ill put the air box back on with a uni filter. Mainly with the airbox off all ill be doing is drag racing dirt and grass field drags.

Mitch Keller · « **Reply #24 on:** January 29, 2013, 11:29:41 am »

http://www.suzukiquadracerhq.com/index.php?action=store;sa=view;id=59

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Author Topic: K&N vs Foam Filter (Read 2128 times)

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