Return-Path: Received: from [216.52.245.18] (HELO ispwestemail2.mdeinc.com) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 882977 for flyrotary@lancaironline.net; Mon, 18 Apr 2005 22:31:22 -0400 Received-SPF: none receiver=logan.com; client-ip=216.52.245.18; envelope-from=wschertz@ispwest.com Received: from 7n7z201 (unverified [63.13.186.9]) by ispwestemail2.mdeinc.com (Vircom SMTPRS 4.1.361.0) with SMTP id for ; Mon, 18 Apr 2005 19:30:27 -0700 Message-ID: <021c01c54487$ba5eb5d0$6401a8c0@7n7z201> From: "William" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Area calcuation for Cone air filters was [FlyRotary] Re: Air filters Date: Mon, 18 Apr 2005 21:30:18 -0500 MIME-Version: 1.0 Content-Type: multipart/related; type="multipart/alternative"; boundary="----=_NextPart_000_0218_01C5445D.D1257F30" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0218_01C5445D.D1257F30 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0219_01C5445D.D1257F30" ------=_NextPart_001_0219_01C5445D.D1257F30 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thanks Ed, I hadn't been to there website, just saw them in catalogs. Bill Schertz KIS Cruiser # 4045 ----- Original Message -----=20 From: Ed Anderson=20 To: Rotary motors in aircraft=20 Sent: Monday, April 18, 2005 7:00 PM Subject: [FlyRotary] Area calcuation for Cone air filters was = [FlyRotary] Re: Air filters Bill, I did some research on the K&N site - they have a formula for = determining filter area needed - the trouble is there is no correlation = (I could find) between the area you calculate and the surface area of = their filters. So I just did a rough calculation of their filters = surface area based on small end - large end and length. On their double = cone types I assume the inner cone is only 10% the area of their outer = cone (which is probably very conservative). I used the 160 CID 4 stroke = equivalent displacement area for the 13B and the below formula. Which = gave me at 7000 rpm a minimum of 53 sq inches required. Then I did the calculation using the attached spreadsheet to compare = their different size filters for area - since they don't give it. = Attached is the spreadsheet for using the below formula and the = calculations for a truncated cone surface area. =20 Use the formula below to compute the minimum size filter required for = your particular application. The usable portion of the filter is called = the EFFECTIVE FILTERING AREA which is determined by multiplying the = diameter of the filter times Pi (3.1416) times the height of the air = filter in inches, then subtracting .75-inch. We subtract .75-inch to = compensate for the rubber seals on each end of the element and the = filter material near them since very little air flows through this area. =20 A =3D effective filtering area CID =3D cubic inch displacement=20 RPM =3D revolutions per minute at maximum power =20 Example: A 350 CID Chevy engine with a horsepower peak at 5,500 = rpm.=20 =20 Ed A ----- Original Message -----=20 From: William=20 To: Rotary motors in aircraft=20 Sent: Monday, April 18, 2005 5:54 PM Subject: [FlyRotary] Re: Air filters If one looks at the K&N cone filters, how big a one is required?=20 Bill Schertz (really tight under my cowl) KIS Cruiser # 4045 -------------------------------------------------------------------------= ----- >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_001_0219_01C5445D.D1257F30 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Thanks Ed, I hadn't been to there = website, just saw=20 them in catalogs.
Bill Schertz
KIS Cruiser # 4045
----- Original Message -----
From:=20 Ed=20 Anderson
Sent: Monday, April 18, 2005 = 7:00=20 PM
Subject: [FlyRotary] Area = calcuation for=20 Cone air filters was [FlyRotary] Re: Air filters

Bill,
 
I did some research on the K&N = site - they=20 have a formula for determining filter area needed - the trouble is = there is no=20 correlation (I could find) between the area you calculate and the = surface area=20 of their filters.  So I just did a rough calculation of their = filters=20 surface area based on small end - large end and length. On their = double=20 cone types I assume the inner cone is only 10% the area of their = outer=20 cone (which is probably very conservative).  I used the 160 CID 4 = stroke=20 equivalent displacement area for the 13B and the below formula.  = Which=20 gave me at 7000 rpm a minimum of 53 sq inches required.
 
Then I did the calculation using the = attached=20 spreadsheet to compare their different size filters for area - since = they=20 don't give it.  Attached is the spreadsheet for using the below = formula=20 and the calculations for a truncated cone surface area.
 
 =20

Use the formula below to compute the = minimum size=20 filter required for your particular application. The usable portion of = the=20 filter is called the EFFECTIVE FILTERING AREA which is determined by=20 multiplying the diameter of the filter times Pi (3.1416) times the = height of=20 the air filter in inches, then subtracting .75-inch. We subtract = .75-inch to=20 compensate for the rubber seals on each end of the element and the = filter=20 material near them since very little air flows through this = area.

3D"A=3D(CID=20
A =3D effective filtering area
CID =3D cubic inch = displacement=20
RPM =3D revolutions per minute at maximum=20 power
Example: A 350 CID Chevy engine with a horsepower peak at = 5,500=20 rpm.
3D"A=3D(350
Ed A
 
 
 
 
----- Original Message -----
From:=20 William=20
To: Rotary motors in = aircraft=20
Sent: Monday, April 18, 2005 = 5:54=20 PM
Subject: [FlyRotary] Re: Air=20 filters

If one looks at the K&N cone = filters, how=20 big a one is required?
Bill Schertz (really tight under my cowl)
KIS Cruiser # = 4045
 

>>  Homepage: =20 http://www.flyrotary.com/
>>  Archive:  =20 = http://lancaironline.net/lists/flyrotary/List.html
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