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Baja Forums -:- VW Volkswagen Bug, Baja, Bus, Sandrail and Thing -:- VW Volkswagen & Baja Bug General Discussion -:- Off Road Air Cleaners
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Off Road Air Cleaners
Bug, Baja, Thing and Buggies. Most every thing that will not fit any any other area. See list of other Forums for better topic placement...Volkswagen General Discussion
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57baja
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Post Post subject: Off Road Air Cleaners
Posted: Mon Jul 21, 2008 09:03 AM
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Ok, we've all got our opinions, let's discuss off road air cleaners. First of all, I' running a moderately large engine, 2187cc with an FK8 and dual 44 Webers. I personally like a 6" tall air cleaner, but unfortunately they won't quite fit, so I'm running 4" cleaners instead. I want the air to be free of restrictions as much as possible, and would like them to last a decent amount of time on the trail without having to take them out and clean them and re-oil them. I know a lot of guys use Outerwears, and I'm certainly open to this, but it just looks like this would restrict air flow. After all, if you dissect an air cleaner, it has dozens of folds in its design that when straightened out, would be several feet long. This allows air to enter into the carb much more efficiently than would if the filter were simply a round piece of filter material, like Outerwears are. This also allows the corrugated air filter surface to clog up less quickly than a flat filter surface.

Another option that is out there is the foam filter wrap that slides over your existing air cleaner. I had a discussion with a guy the other day who was using these, and he swore by them. He had a similar engine configuration as I do, and I thought perhaps I'd try these out. He swears by coating them in a light coating of baby oil, rather than using K&N oil. Hey. I thought this was a cool idea. So I bought a pair the other day, since I was at a VW store. Unfortunately they were made by Empi, so I knew they had to be crap, but I thought I'd buy them anyway, just to try them. I coated them in K&N oil since I don't have any baby oil in the garage and carefully slipped them on. I noticed today that they're already splitting at the seam, and I haven;t even had a chance to drive the damn thing yet.

Anyone have any thoughts, data, tests, or personal experience with a trick set up for off road air filters? Surely someone must.


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bajawarrior
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Post Post subject: Re: Off Road Air Cleaners
Posted: Mon Jul 21, 2008 03:32 PM
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I ran the foam wraps on my old car. The first set i did the oil I did not like it got to much dirt in a short run all the trail dust just sticks to them. The car was sitting at a camp site not run but cars running down the trail made so much dust it just stuck to the foam. So I just run tall k&N and the foam dry. The carbs stay clean inside and run great. I wash the foam at the camp site or end of each trip.

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ditch68
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Post Post subject: Re: Off Road Air Cleaners
Posted: Tue Jul 22, 2008 02:23 AM
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I run a 2 stage Uni filter in a spun aluminum housing. I oil the inner stage lightly with K&N oil.

One offroading adventure on a dusty day, and that thing is dirty! I clean it often. Works well.

I am currently running a Zenith NDIX, I may build an air log with dual filters one of these days and locate it in the car for less dust. I don't care if it's noisy - the car already is.

Jeff


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trd2001
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Post Post subject: Re: Off Road Air Cleaners
Posted: Tue Jul 22, 2008 07:04 AM
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i have been looking at one of these.

www.kartek.com/Product...s/UMP.html


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DeMilled
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Post Post subject: Re: Off Road Air Cleaners
Posted: Wed Jul 23, 2008 07:59 AM
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Those UMP set-ups are hella slick, they come with a pretty hefty price tag as well don't they?
On a couple of occasions people have said that the air filters on big rigs work on the same principals as the UMPs but are mass produced and made of plastic so you can get them for less. Just what I have seen a few people say on the net, I have not checked into it yet.

57baja, could you picture a set-up simular to an air log but one for each carb? I have in mind a box sort of deal sitting right on top of the carb with the cone style K&N filters coming out of each side of the box. Since space is an issue you can have one filter facing inboard and the other facing the rear of the car. With a box like that holding two filters on each carb you should have plenty of flow and they wouldn't get dirty too fast.
Just throwing out ideas.....

As for data, I know there was a discussion about this very topic on a forum and someone posted links to lab. tests that had been run on different filters. I will try to find it.....don't hold your breath though, this was a while ago.
From what I remember the good ol' paper filters from name brand manufacturers did extremely well. Oiled foam didn't do as well as the hype would lead people to think but if you combine a tall, large diameter paper filter with an inner oiled foam element you will have about the best you can ask for. The tests didn't mention the cyclopathic style like the UMP one though.

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57baja
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Post Post subject: Re: Off Road Air Cleaners
Posted: Wed Jul 23, 2008 08:32 AM
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From the feedback I'm getting out there, I think I'm going the UNI route. I don't need a big, complex air induction system. I just need something simple that works. The reason I run K&N's is that they are fairly simple and easy to clean after a day in the dirt. They do a good job of keeping the dust out of the motor. I've seen data on the paper filter comparisons, too. Who wants to change two filters every day, though?


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WaBaja
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Post Post subject: Re: Off Road Air Cleaners
Posted: Fri Jul 25, 2008 02:04 AM
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I am thinking the same as you 57baja. I think im going to get a large uni filter for my single carb.


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