Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Fri, 18 Feb 2005 21:33:53 -0500 Message-ID: X-Original-Return-Path: Received: from imo-m25.mx.aol.com ([64.12.137.6] verified) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP id 745099 for lml@lancaironline.net; Fri, 18 Feb 2005 17:48:01 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.6; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-m25.mx.aol.com (mail_out_v37_r3.8.) id q.1de.354f7e43 (16633) for ; Fri, 18 Feb 2005 17:47:12 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: <1de.354f7e43.2f47ca70@aol.com> X-Original-Date: Fri, 18 Feb 2005 17:47:12 EST Subject: Re: [LML] Re: LNC2 cowl inlet size X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1108766832" X-Mailer: 9.0 Security Edition for Windows sub 5000 -------------------------------1108766832 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 2/18/2005 3:49:29 P.M. Central Standard Time, marv@lancaironline.net writes: Interested to have input from the list on cowl inlet sizes, and if anyone has increased the diameter, and how that has affected the CHT cooling. My O-320 has the prop control located inside the left cowl intake, and it seems to me that it affects the intake flow by a large percentage. For example, cyl 2 CHT, given its location relative to airflow, is the hottest cylinder. Photos of any cowl remodelling would be appreciated. Dom, Cyl 2 CHT used to be my hottest. No longer. If you look at where Lancair positioned the bottom of the baffling as it comes to the head, note that there is about a 1/2 inch bend up to lay against the head fins (just keep you focus on the upper head, not the barrel). If you also examine the cyl, there is a flat spot at the forward edge. So, no air that curls over the lip can pass downward and over the fins below the flat area and the lower plug. Your actual situation may vary slightly since I have ECI cylinders but look at it anyway. I redrilled the few holes in the base plate of the baffle to move the aluminum that wraps the fwd lower head fins forward by 1/4 to 3/8 inch. I also bent the edges of the lower wrap so that no air could escape from the sides. Then I cut that upward flared lip off. Then, I made a small deflector that sits about 1/2 inch above the base baffle plate and directs the air downward into the space created as noted above. This dropped the head temp 10-15 degrees and is now more in line with others. Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) Fair and Balanced Opinions at No Charge! There is an oxymoron in that, somewhere... -------------------------------1108766832 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 2/18/2005 3:49:29 P.M. Central Standard Time,=20 marv@lancaironline.net writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000=20 size=3D2>Interested to have input from the list on cowl inlet sizes, and=20 if
anyone has increased the diameter, and how that has affected=20= the=20 CHT
cooling.
My O-320 has the prop control located ins= ide=20 the left cowl intake, and
it seems to me that it affects the int= ake=20 flow by a large percentage.
For example, cyl 2 CHT, given its location=20 relative to airflow, is the
hottest cylinder.
Photos o= f=20 any cowl remodelling would be appreciated.

Dom,

Cyl 2 CHT used to be my hottest. No longer.

If you look at where Lancair positioned the bottom of the baffling as i= t=20 comes to the head, note that there is about a 1/2 inch bend up to lay agains= t=20 the head fins (just keep you focus on the upper head, not the barrel). = If=20 you also examine the cyl, there is a flat spot at the forward edge. So= , no=20 air that curls over the lip can pass downward and over the fins below the fl= at=20 area and the lower plug. Your actual situation may vary slightly since= I=20 have ECI cylinders but look at it anyway.

I redrilled the few holes in the base plate of the baffle to move the=20 aluminum that wraps the fwd lower head fins forward by 1/4 to 3/8 inch. = ; I=20 also bent the edges of the lower wrap so that no air could escape from the=20 sides. Then I cut that upward flared lip off. Then, I made a sma= ll=20 deflector that sits about 1/2 inch above the base baffle plate and directs t= he=20 air downward into the space created as noted above. This dropped the h= ead=20 temp 10-15 degrees and is now more in line with others.=20

Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)

Fai= r=20 and Balanced Opinions at No Charge!
There is an oxymoron in that,=20 somewhere...

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