Miata Mailing List: June 1994, Message #68
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   From: hazmat@motor.arl.army.mil
Subject: Re: K&N
   Date: Mon, 6 Jun 1994 14:35:19 -0400

I posted this before, back in February, and given the  recent talk about 
K&N filters, I thought reposting it would be appropriate.


>Here's something I thought would be of interest, considering the
>talk there has been going on about the K&N air filter.  It may
>not be the wonder-filter everyone says.  I got Ed's permission to
>post this here.  I got it off of the BMW motorcycle mailing list.
>
>Matt
>hazmat@motor.arl.army.mil
----------------------------- Note follows -----------------------------
From: Ed Hackett
X-Original-Sender: edh@maxey.unr.edu
Date: 25 Feb 94 00:12:40 CST (Fri)


Here's the info I have on air filter performance.  Tests were done using 
SAE J726C Test Method  5-best --> 1-worst

                              Oiled foam    Paper   Oil Bath   Oiled Gauze
                             (AMSOIL, UNI)                        (K&N)

Large particle efficiency          5          5         5            4
Small particle efficiency          5          4         1            2
Airflow capacity                   5          2         3            5
Dust holding capacity              4          2         5            2
Load up characteristic             4          1         5            1
Backfire characteristic            3          2         5            3
Cleanability                       4          1         4            3

As you can see, K&Ns are great for airflow, which is what they were 
designed for.  Their original application was on racing engines, where 
airflow is important and ultimate engine life was of little consern.  They 
are not as good at filtering as paper or oiled foam types.

 Ed Hackett   edh@maxey.unr.edu           The Desert Research Institute 
 DoD #0200  WMTC  BMWRA  DIOC             Reno, Nevada   (702) 673-7380   
 KotLS  KotLE  DotD #0003            I'm not really a chemist, I'm just one of
 900SS  K100RS  501 CAMEL            them motorsickle sonsabitches.  __=o&o>__

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Matt Bennett                 Army Research Lab
hazmat@motor.arl.army.mil    Microwave Sensors, AMSRL-SS-SG
                             2800 Powder Mill Road
                             Adelphi, MD 20783
                             301-394-2530
                             301-394-4690 (FAX)
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