X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 26 Aug 2009 21:51:23 -0400 Message-ID: X-Original-Return-Path: Received: from n10.bullet.re3.yahoo.com ([68.142.237.123] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with SMTP id 3825418 for lml@lancaironline.net; Wed, 26 Aug 2009 14:39:17 -0400 Received-SPF: none receiver=logan.com; client-ip=68.142.237.123; envelope-from=casey.gary@yahoo.com Received: from [68.142.237.88] by n10.bullet.re3.yahoo.com with NNFMP; 26 Aug 2009 18:38:39 -0000 Received: from [216.252.110.140] by t4.bullet.re3.yahoo.com with NNFMP; 26 Aug 2009 18:38:39 -0000 Received: from [127.0.0.1] by omp210.mail.re3.yahoo.com with NNFMP; 26 Aug 2009 18:38:39 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 520909.72628.bm@omp210.mail.re3.yahoo.com Received: (qmail 46188 invoked by uid 60001); 26 Aug 2009 18:38:39 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=Zvwqen4Z0ft2LGLreBWlkyDsZCCArwVv4Vtnfr/qy/harV5lhqmlrV/MZzDXcSK9OQ04hhz6fL8B2cMF0Gsa6hRCqN9nyuIL+1kOu+/VDrhQiH0l6LPt0epvapCbbIWAJ6jT+pmENc/RJ7yUytZOEoOUjw95XHPuJi3CXFGr3DM=; X-Original-Message-ID: <350026.43951.qm@web57508.mail.re1.yahoo.com> X-YMail-OSG: 4KLnajMVM1m585exYRlGMXYw1l9._o2k5oH6eaoP7XbK1j8F21Hpy6d6BsN1z5d1w.VIUVbAQlzkgaSpkWUotuh3NFCCxfxHjQgQo8WAx7rJt.O6PU7X7dF1rPTxNfzOjnoXl_Hi6CLlXtod2AgaNntBT_x.MYbQmMQt2kA9Rc6AAiRer7XexYQrVtxbitC4sTrjCPs_0cDi2GJjQlZPi97rq3IHlo7eHie_6pu_S6b3FIVKU_qF9GmexszhNIDY9iuqgDreL3Pq4IefKg9iM8KIaulqGLlAN3zHDK4KRL5LNWgEiBW0e5E- Received: from [64.211.51.6] by web57508.mail.re1.yahoo.com via HTTP; Wed, 26 Aug 2009 11:38:39 PDT X-Mailer: YahooMailRC/1358.27 YahooMailWebService/0.7.338.2 References: X-Original-Date: Wed, 26 Aug 2009 11:38:39 -0700 (PDT) From: Gary Casey Subject: Re: Plenum pressure and Injector performance LOP X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-664551074-1251311919=:43951" --0-664551074-1251311919=:43951 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable One thing I just recalled doing:=A0 The question at at hand was how to tell= if the air flow into the injector vents is enough to help with LOP operati= on (it improves the atomization).=A0 One experiment I did was to do a "lean= sweep" at full throttle (non-turbocharged) and record the data and note wh= en the engine starts to run rough.=A0 Then I pulled the throttle back just = enough to drop the manifold pressure by about 1 inch and repeat the test.= =A0 The idea is that this increases the pressure drop across the injector b= y 1 inch and if there was an atomization problem before this should fix it.= =A0 My results were not entirely conclusive, but generally the engine would= run further LOP before running rough.=0AGary Casey=0A=0A=0A --0-664551074-1251311919=:43951 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable

One thing I just recalled doing: The question at a= t hand was how to tell if the air flow into the injector vents is enough to= help with LOP operation (it improves the atomization). One experimen= t I did was to do a "lean sweep" at full throttle (non-turbocharged) and re= cord the data and note when the engine starts to run rough. Then I pu= lled the throttle back just enough to drop the manifold pressure by about 1= inch and repeat the test. The idea is that this increases the pressu= re drop across the injector by 1 inch and if there was an atomization probl= em before this should fix it. My results were not entirely conclusive= , but generally the engine would run further LOP before running rough.

= =0A

Gary Casey

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