Return-Path: Received: from [199.185.220.224] (HELO priv-edtnes40.telusplanet.net) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 883143 for flyrotary@lancaironline.net; Tue, 19 Apr 2005 02:17:04 -0400 Received-SPF: pass receiver=logan.com; client-ip=199.185.220.224; envelope-from=haywire@telus.net Received: from Endurance ([207.216.158.117]) by priv-edtnes40.telusplanet.net (InterMail vM.6.01.04.00 201-2131-118-20041027) with SMTP id <20050419061618.ZQDW6174.priv-edtnes40.telusplanet.net@Endurance> for ; Tue, 19 Apr 2005 00:16:18 -0600 From: "Todd Bartrim" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Area calculation for Cone air filters was [FlyRotary] Re: Air filters Date: Mon, 18 Apr 2005 23:15:35 -0700 Message-ID: <008501c544a7$34295b80$0101a8c0@Endurance> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0086_01C5446C.87CA8380" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook CWS, Build 9.0.2416 (9.0.2910.0) Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0086_01C5446C.87CA8380 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit I'm glad you threw this in Jerry. I'd just woefully discovered that my 4x10 flat K&N filter was undersized at only 40 sq in, however you just quadrupled that to 160 sq in. But this discussion has got me to thinking and I just realized that I've been using my filter with airflow backwards... DO'H! I built my airbox such that it sits in upright, but recent comments reminded me that the normal airflow on cars has the flow come in from the bottom. I'd be surprised if it made much difference until the filter is near dirty anyhow, but maybe I'll check to see if I have the clearance to set the filter into it's holder upside down. Todd (up over with down under filter) Ps; Ed as usual, nice work with the spreadsheet. Ed, the surface area of the filter is much greater than its circumference x height due to the folding of the element. I just checked mine and each inch equals 4 inches if stretched out. Thus the surface area on my 5.5 in. round x 5 inch high filter would be over 300 sq. in. Jerry ------=_NextPart_000_0086_01C5446C.87CA8380 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I'm=20 glad you threw this in Jerry. I'd just woefully discovered that my 4x10 = flat=20 K&N filter was undersized at only 40 sq in, however you just = quadrupled that=20 to 160 sq in.

But this discussion has got me to thinking and = I just=20 realized that I've been using my filter with airflow backwards... = DO'H! I=20 built my airbox such that it sits in upright, but recent comments = reminded me=20 that the normal airflow on cars has the flow come in from the bottom. = I'd be=20 surprised if it made much difference until the filter is near dirty = anyhow, but=20 maybe I'll check to see if I have the clearance to set the = filter into=20 it's holder upside down.

Todd (up over with down under=20 filter)

Ps; Ed=20 as usual, nice work with the spreadsheet.

Ed, the surface area of the filter is = much=20 greater than its circumference x height due to the folding of the = element. I=20 just checked mine and each inch equals 4 inches if stretched out. Thus = the=20 surface area on my 5.5 in. round x 5 inch high filter would be over = 300 sq.=20 in. Jerry

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