X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 14 Dec 2005 12:38:33 -0500 Message-ID: X-Original-Return-Path: Received: from systems3.net ([68.98.211.24] verified) by logan.com (CommuniGate Pro SMTP 5.0.4) with ESMTPS id 881760 for lml@lancaironline.net; Wed, 14 Dec 2005 10:21:07 -0500 Received-SPF: none receiver=logan.com; client-ip=68.98.211.24; envelope-from=cberland@systems3.net Received: from systems0d3b724 ([192.168.1.81]) by systems3.net (8.13.4/8.13.4/Debian-3) with SMTP id jBEFIVfI017892 for ; Wed, 14 Dec 2005 08:18:31 -0700 X-Original-Message-ID: <004801c600c2$11aaf5f0$5101a8c0@systems0d3b724> From: "Craig Berland" X-Original-To: "Lancair Mail List" Subject: [LML] Re: Air filters X-Original-Date: Wed, 14 Dec 2005 08:21:29 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0045_01C60087.6228BDE0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1506 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1506 X-Virus-Scanned: ClamAV 0.86.2/1209/Mon Dec 12 08:48:01 2005 on systems3.net X-Virus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0045_01C60087.6228BDE0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Angier Ames: According to Lycoming, my IO360B1F will gulp 1,150 lbs/hr = of air. Now, the question is... how does one equate lbs/hr to cfm in order to = come up =20 with the right size filter? Here's a way to get cfm. 360 cu in /2 *2700 rpm =3D 486000 cu in/min / 1728 =3D 281 cfm This is at 100% volumetric efficiency. If you want to be safe or have a = good ram induction....increase this by 10% or 15%. If turbocharged, the VE = can=20 be way above 100%. Remember, you would like "no" pressure drop across the air filter, as any delta P in the intake system produces a = significant power loss. Put as much filter as will fit. One rated at 600 cfm would "sound" good to = me. Check=20 to see what delta P they rate the filter at. The higher the delta P the = higher the CFM will be. What you want is high CFM at low delta P. Craig Berland ------=_NextPart_000_0045_01C60087.6228BDE0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Angier Ames:=20 According to Lycoming, my IO360B1F  will gulp 1,150 lbs/hr of=20 air.
Now, = the question is...=20 how does one equate lbs/hr to cfm in order to come up 
with the = right=20 size filter?
 
Here's a way to=20 get cfm.
360 cu in /2=20 *2700 rpm =3D 486000 cu in/min / 1728 =3D 281 cfm
This is at 100%=20 volumetric efficiency.  If you want to be safe or have a=20 good
ram=20 induction....increase this by 10% or 15%.  If turbocharged, the VE = can=20
be way above 100%.  Remember, you would like "no" pressure = drop=20 across
the air filter, as any delta P in the intake system produces a = significant power loss. Put
as much filter as will fit. One rated at 600 cfm would "sound" = good to=20 me. Check 
to see what delta P they rate the filter at. The higher = the delta=20 P the higher the CFM
will be.  What you want is high CFM at low delta P.
Craig=20 Berland

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