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Author Topic:   Air Filter Debate
Dirt Forum Racer

Total posts: 81
posted June 28, 2005 08:52 AM  
I started running NAPA gold throwaways (14 x 3). No pre-filter. Went through one every other week.

Moved to K&N reusable, with the trusty little accompanying oil & cleaner kit, used that for a few months with a pre-filter (the thin kind, not the big foam kind. Cleaned it once a month or so. Now it feels like it weighs 50 pounds and doesn't seem to be coming clean at all. Used only the specified K&N stuff and water -- no soap or anything else. It's just a big wad of grime.

Went back to the NAPA Golds for now, with a pre-filter. Have run one for two weeks. Looks like ****, but you can still see light through it.

Who runs what? Anyone found something that works better than others? Are the Summit or Accel brand reusables as good as the K&N's or are the K&N filters much better? Just run a $5 throwaway and change it once every two or three weeks?

We run a 14 x 3. Anyone run 14 x 4 on their pure-stocks? (Stock 400 sbc, stock crank/rods/pistons, 480 cam, old double-hump heads, headers, Q-jet -- turns about 6200 on 1/4-mi track and runs anywhere from 200 to 220 depending on how hot it is outside and how many cautions we've had).

Thanks much!

Dirt Maniac

Total posts: 128
posted June 28, 2005 09:11 AM  
I use the NAPA Gold or Wix with pre filter. I replace filter every three races. I hade no luck with K&N, dirt stopped up pre filter.

Dirt Freak

Total posts: 217
posted June 28, 2005 10:43 AM  
Started with paper this year and didn't care for the dirt I was seeing in the carb.minute amount.Ihad been using amsoil foam which worked great,I would still be using one but they don't make a 4".Have a k&n on it now which I don't really care for either but it seems to keep the carb clean.My choice is the double foam amsoil filter.

Dirt Maniac

Total posts: 120
posted June 28, 2005 11:43 AM  
Wix 42096R - 14x4. Oil stays cleaner much longer than with the K&N.

sc1 racing
Dirt Freak

Total posts: 419
posted June 28, 2005 01:40 PM  
i run the microgaurd it comes with the foam on the out side. i still replace it everymonth. best thing to do is build a litle sheild to keep mud off of your filter.exspecially if you are running a high dollar filter. performance wise ive never noticed a diif between a 50 or a 5 dollar filter. personally id rather throw a filter away than to clean it..but he im a lazy mo fo...

Dirt Freak

Total posts: 243
posted June 28, 2005 05:28 PM  
paper filter with foam pre-filter, and replace paper every race night

devil wrench
Dirt Maniac

Total posts: 178
posted June 29, 2005 10:43 AM  
we use papers, with a foamie... we replace the paper at our discretion, depending on track conditions...

one tip... smear a VERY THIN layer of Vaseline all over the inside of your air cleaner housing, it will show anything getting through the filter. Vaseline is much easier to see the dirt than using grease. Make sure it's a very thin layer, or the vacuum will pull excess into the carb and you'll run like chit after that.

Dirt Maniac

Total posts: 131
posted June 30, 2005 06:41 AM  
been running the same k&n for 4 years now. Lot cheaper than paper.

wheel packer
Dirt Roller

Total posts: 11
posted June 30, 2005 07:12 AM  
If you use the K&N you need to clean them with gasoline, then get as much out as you can by just simply waving in the air, then let air dry. THen the next day spray with K&N oil very lightly. Put your clean bra on after it too is cleaned in gas. Put thin layer of wheel bearing grease on top and bottom of filter holder. Never had one bit of prob.

Dirt Forum Champ
Total posts: 626
posted June 30, 2005 12:22 PM  
It sounds like you are using to much oil. As mentioned it just takes a very light coat of oil.

The Flash32
Dirt Maniac

Total posts: 120
posted June 30, 2005 01:17 PM  
I can't believe anyone would clean a K&N filter of any kind with gas. The inside of it is cotton. My crewchief always uses the cleaner designed for it. Never had a problem with ours!!

Dirt Forum Racer

Total posts: 94
posted June 30, 2005 04:45 PM  
A light solvent that is washed throught the filter from the inside out works good, and will not be harmful as long as it is rinsed with a slow running flow of water from a hose shortly after washing with the solvent. Once it is rinsed, soak in warm soapy water(dishwashing liquid works fine) for an hour or so. Rinse with warm water, then hang it to dry in an open but dust free area. Do exactly as the oil can says, and let sit, reapply where it is still white after soaking in. I have used S&B air filters with the K&N oil, and have never seen anything to alarm me. One thing that can really help keeping dirt out is making sure that things like your throttle shaft end on base plates, are sealed(preferably with something like a welch plug. Keep shafts lubed, especially on the throttle side where it is getting the most load from springs etc. If you run on alcohol, using a spray such as wd-40 keeps all linkages free, and of course cuts down on corrosion.

Dirt Full Roller

Total posts: 32
posted July 01, 2005 11:48 AM  
One of the racing secrets is the Amsoil filter. No kidding guys this is the greatest out there. Cleans EASY with soap and water. We painted the inside of the air cleaner housing black and put a real light film of oil on it with a K&N and seen a lot of dirt on it. You can hold it up to a light and see pin holed in it. Amsoil offers a 2 foam system that you can oil the inside and leave the outside dry. Oil samples show a real good result versus the K&N oil samples. Both filters were brand new at the beginning of this year. NEVER run anything but amsoil filter from now on.


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