Return-Path: Received: from [24.25.9.102] (HELO ms-smtp-03-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 883890 for flyrotary@lancaironline.net; Tue, 19 Apr 2005 15:43:30 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.102; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-185-127.carolina.res.rr.com [24.74.185.127]) by ms-smtp-03-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j3JJgeY5026196 for ; Tue, 19 Apr 2005 15:42:42 -0400 (EDT) Message-ID: <000d01c54517$f4431ad0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Area calcuation for Cone air filters was [FlyRotary] Re: Air filters Date: Tue, 19 Apr 2005 15:42:43 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000A_01C544F6.6CF84260" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_000A_01C544F6.6CF84260 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageRusty, some of the cones have an opening on the intake in and = another smaller cone that is inside the large cone for increased = filtering area. They don't specify the dimensions of this inner cone so = I conservatively just make it 10% of the total filter area of the larger = cone. Its probably more than 10% and if you want to get real = conservative just leave it out. If its just the regular one cone then = you just ignore the smaller cones calculation. If really pressed for = space (as some folks claim they are) the double cone gives you more = filter area in a smaller space. That filter should give you approx 352 square inches of filter space. = For a 13B at 7000 rpm K&N area calculation says 53 sq inches is = sufficient, so yes, I think I can safely say you have more than enough = filter area. So thats good as it will give more filtering and less = airflow obstruction. Ed ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Tuesday, April 19, 2005 1:39 PM Subject: [FlyRotary] Re: Area calcuation for Cone air filters was = [FlyRotary] Re: Air filters Neat spreadsheet Ed, but I don't understand what the "inner cone" is. = There's just one cone on these right? Just to make sure I'm reading = this right, how about checking my thoughts here. =20 I am looking at the K&N cone shaped filter # RU-5111. It has a 3" = flange, 4.5" base, 3.5" top, and is 5.75" long. It looks to me like = this gives plenty of area. Do you agree (before I order it)? =20 Thanks, Rusty (may fix my low temps with a supercharger) ------=_NextPart_000_000A_01C544F6.6CF84260 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Rusty, some of the cones have an = opening on the=20 intake in and another smaller cone that is inside the large cone for = increased=20 filtering area.  They don't specify the dimensions of this inner = cone so I=20 conservatively just make it 10% of the total filter area of the larger = cone. Its=20 probably more than 10% and if you want to get real conservative just = leave it=20 out.  If its just the regular one cone then you just ignore the = smaller=20 cones calculation.  If really pressed for space (as some folks = claim they=20 are) the double cone gives you more filter area in a smaller = space.
 
That filter should give you approx 352 = square=20 inches of  filter space.  For a 13B at 7000 rpm K&N area=20 calculation says 53 sq inches is sufficient, so yes, I think I can = safely say=20 you have more than enough filter area.  So thats good as it will = give more=20 filtering and less airflow obstruction.
 
Ed
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Tuesday, April 19, 2005 = 1:39=20 PM
Subject: [FlyRotary] Re: Area = calcuation=20 for Cone air filters was [FlyRotary] Re: Air filters

Neat=20 spreadsheet Ed, but I don't understand what the "inner cone" is.  = There's=20 just one cone on these right?  Just to make sure I'm reading this = right,=20 how about checking my thoughts here. 
 
I am=20 looking at the K&N cone shaped filter # RU-5111.  It has = a 3"=20 flange, 4.5" base, 3.5" top, and is 5.75" long.  It looks to = me like=20 this gives plenty of area.  Do you agree (before I order=20 it)?  
 
Thanks,
Rusty=20 (may fix my low temps with a=20 supercharger) 
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