Air Filter Size (Hopefully last filter question!) - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 02-15-2001, 10:02 PM
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Air Filter Size (Hopefully last filter question!)

Here's hopefully my last question on Air Filters:
Does it matter what size I put on my 258? Will certain filters or certain sizes reduce the amount of air that gets in? I realize that K&N is the best, but someone explain how they can trap MORE particles, but let more air in at the same time - it doesn't really make sense if you look at the physics. :-) Anyone enlighten me?

Jed Smith
'80 CJ7,258 w/TR,4" spring lift + 1" shackles.
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post #2 of (permalink) Old 02-15-2001, 10:58 PM
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Re: Air Filter Size (Hopefully last filter question!)

Don't know about the phyics of it, but I've been using K&N filters on everything I own for over 25 years, cars, trucks, motorcycles. They just plain work, seem to give a very slight performance increase, and you will never have to buy another filter (especially good deal in the desert!). Just make sure you use ONLY K&N cleaner and oil.

ORC Land Use Section Editor
Vice-Pres. Rock Garden 4 Wheelers, Farmington, NM
post #3 of (permalink) Old 02-15-2001, 11:41 PM
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Re: Air Filter Size (Hopefully last filter question!)

I can only concur with Brad, I have used K & N on all my vehicles and pays off in the long run. I currently have a 13 in diameter X 4 in tall filter on my 304 and believe me it sucks in the air.


76 CJ5 304 "its a JEEP thing, I hope you understand"
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post #4 of (permalink) Old 02-16-2001, 10:44 AM
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Re: Air Filter Size (Hopefully last filter question!)

Ok, thanks. That settles it, I guess. Do the chrome K&N's fit under the hood on a 258 very well? Thinking about getting one from Rosser Think Jeep.

80 CJ7 258w/TR,Holley carb,5" lift,33x12.5's.
post #5 of (permalink) Old 02-16-2001, 12:34 PM
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Re: Air Filter Size (Hopefully last filter question!)

A regular paper filter is just that, a solid piece of paper. Not air tight but not easy to breath thru either. The K&N filters are a gauze material like a hospital bangage. Obviosly a lot more air can pass thru this than paper. However the gauze isn't as good at keeping out tiny particles, this is where the K&N oil comes into play. Because it just wets the gauze, it still allows gobs of air thru, but the oil always remains tacky and this is what traps the particles. A lot more dirt sticks to the tacky oil that does the paper. Get the K&N, you'll be happy.

'88 Sahara, 4.2, auto.
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