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Date: Mon, 20 Jan 2014 16:28:08 -0500
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From: Chris Zavatson <chris_zavatson@yahoo.com>
Reply-To: Chris Zavatson <chris_zavatson@yahoo.com>
Subject: K&N air filter
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This brings up another question.=A0 How well does the paper filter hold up =
when getting struck by rain drops and 240 mph?=A0 I think in IVs and Legacy=
s the filter is somewhat protected so this may not be an issue.=A0 In the 3=
20/360 the filter is in direct view of oncoming bugs and rain drops.=0AChri=
s=0A=0A=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=0ACan we agree that=
 a K&N filter is better than no filter at all?=A0 Of this, I am sure becaus=
e each time I have cleaned or replaced my K&N, it has been noticeably dirty=
.=0A=0AOpinions usually vary -=A0and mine does=A0as to=A0the use of K&N fil=
ters in our often-IFR-used airplanes.=A0 I use the K&N filter despite the r=
easons cited by previous writers on this topic.=A0 My use of=A0K&N filters =
is because=A0they pass the "suck" test while paper filters fail this test=
=A0(I have not exhaustively tested=A0 automotive=A0paper filters).=0A=0AIn =
the=A0mid 1990's, I remember reading of a light aircraft that crashed becau=
se it had ingested its own wet=A0air filter; yes it was a cellulose-type au=
tomotive filter.=A0 (Sorry, I don't have references to this article or even=
t.)=A0 Still building my LNC2 at that time, I=A0elected to do my own suck t=
est -=A0and I recommend that you too do a suck test on your aircraft filter=
s.=0A=0AConduct the=A0suck test=A0by cutting out a piece of old paper filte=
r (automotive) and then wet part of it by dipping it in water.=A0 The other=
 half should be kept dry.=A0 Now, suck on the dry part and you will find th=
at breathing is easy.=A0=A0Next, suck on the wet part and you will find you=
rself turning blue for lack of oxygen.=0A=0ARepeat the suck test on a K&N f=
ilter and you will note that breathing is easy whether wet or dry because t=
he filter is oiled.=0A=0AI was satisfied that a wet paper filter could, ind=
eed, cause power loss on an aircraft engine - especially because our IFR ai=
rcraft must necessarily advance into clouds, rain, ice and snow without=A0t=
he slightest power hesitation or interruption=A0- unlike racing automobiles=
 that=A0wisely avoid rain, ice and snow.=0A=0AMy shoulders are broad=A0and =
my loins are girded;=A0I can take the slings and arrows that are sure to co=
me.=A0 In the words of Bill O'Reilly, "Am I wrong?"=A0"=0A
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<html><body><div style=3D"color:#000; background-color:#fff; font-family:ti=
mes new roman, new york, times, serif;font-size:14pt"><div>This brings up a=
nother question.&nbsp; How well does the paper filter hold up when getting =
struck by rain drops and 240 mph?&nbsp; I think in IVs and Legacys the filt=
er is somewhat protected so this may not be an issue.&nbsp; In the 320/360 =
the filter is in direct view of oncoming bugs and rain drops.</div><div>Chr=
is</div><div><br></div><div>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D</div><div>Can we agree that a K&amp;N filter is better than no filter a=
t all?&nbsp; Of this, I am sure because each time I have cleaned or replace=
d my K&amp;N, it has been noticeably dirty.</div><div><br></div><div>Opinio=
ns usually vary -&nbsp;and mine does&nbsp;as to&nbsp;the use of K&amp;N fil=
ters in our often-IFR-used airplanes.&nbsp; I use the K&amp;N filter despit=
e the reasons cited by previous writers on this topic.&nbsp; My use of&nbsp=
;K&amp;N filters is
 because&nbsp;they pass the "suck" test while paper filters fail this test&=
nbsp;(I have not exhaustively tested&nbsp; automotive&nbsp;paper filters).<=
/div><div><br></div><div>In the&nbsp;mid 1990's, I remember reading of a li=
ght aircraft that crashed because it had ingested its own wet&nbsp;air filt=
er; yes it was a cellulose-type automotive filter.&nbsp; (Sorry, I don't ha=
ve references to this article or event.)&nbsp; Still building my LNC2 at th=
at time, I&nbsp;elected to do my own suck test -&nbsp;and I recommend that =
you too do a suck test on your aircraft filters.</div><div><br></div><div>C=
onduct the&nbsp;suck test&nbsp;by cutting out a piece of old paper filter (=
automotive) and then wet part of it by dipping it in water.&nbsp; The other=
 half should be kept dry.&nbsp; Now, suck on the dry part and you will find=
 that breathing is easy.&nbsp;&nbsp;Next, suck on the wet part and you will=
 find yourself turning blue for lack of
 oxygen.</div><div><br></div><div>Repeat the suck test on a K&amp;N filter =
and you will note that breathing is easy whether wet or dry because the fil=
ter is oiled.</div><div><br></div><div>I was satisfied that a wet paper fil=
ter could, indeed, cause power loss on an aircraft engine - especially beca=
use our IFR aircraft must necessarily advance into clouds, rain, ice and sn=
ow without&nbsp;the slightest power hesitation or interruption&nbsp;- unlik=
e racing automobiles that&nbsp;wisely avoid rain, ice and snow.</div><div><=
br></div><div>My shoulders are broad&nbsp;and my loins are girded;&nbsp;I c=
an take the slings and arrows that are sure to come.&nbsp; In the words of =
Bill O'Reilly, "Am I wrong?"&nbsp;"</div></div></body></html>
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