Miata Mailing List: September 1994, Message #5
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   From: 
Subject: (none)
   Date: Thu, 1 Sep 1994 07:57:51 -0400

	id m0qgAp4-0007xkC; Thu, 1 Sep 94 08:00 EDT
Message-Id: 
From: mjb@vince.arl.mil (Matthew J. Bennett)
Subject: Re: K&N Filtercharger Injection Performance Kit
To: daumda@smtplink.en.wpafb.af.mil
Date: Thu, 1 Sep 1994 08:00:54 -0400 (EDT)
Cc: miata@jhunix.hcf.jhu.edu
In-Reply-To: <9407317783.AA778376527@smtplink.en.wpafb.af.mil> from "daumda@smtplink.en.wpafb.af.mil" at Aug 31, 94 04:45:45 pm
X-Mailer: ELM [version 2.4 PL23]
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>      I am interested in your impression of the overall K&N system 
>      performance, was it worth the money, do you notice a difference in 
>      seat-of-the-pants performance, did it increase intake air noise, would 
>      you do it over again, etc.
>
>      DRAKE A. DAUM, President
>      Miami Valley Miata Club


This is something I plucked off of the BMW mailing list a while back.  This is 
being reposted without permission.  While this does not cover the kit, it does
cover the performance of K&N filters in general.  This ought to be added to
our FAQ, but is that project still around?

Matt
hazmat@motor.arl.army.mil
mjb@vince.arl.mil

----- Included file
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>__