Return-Path: Sender: (Marvin Kaye) To: lml Date: Fri, 19 Sep 2003 08:22:37 -0400 Message-ID: X-Original-Return-Path: Received: from imo-d06.mx.aol.com ([205.188.157.38] verified) by logan.com (CommuniGate Pro SMTP 4.1.3) with ESMTP id 2585535 for lml@lancaironline.net; Fri, 19 Sep 2003 08:04:06 -0400 Received: from Sky2high@aol.com by imo-d06.mx.aol.com (mail_out_v36_r1.1.) id q.39.3dee3a8e (3964) for ; Fri, 19 Sep 2003 08:04:05 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: <39.3dee3a8e.2c9c4ab4@aol.com> X-Original-Date: Fri, 19 Sep 2003 08:04:04 EDT Subject: Re: [LML] Re: Cooling Issues X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1063973044" X-Mailer: 9.0 for Windows sub 1060 -------------------------------1063973044 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 9/18/2003 9:46:04 PM Central Daylight Time, sreeves@sc.rr.com writes: I have a Lycoming O-320 with a remote mounted cooler (on the firewall). Steve, I am running an IO320 with a 7 vane (small) Stewart-Warner cooler mounted on the left firewall and fed by a large NACA duct on the side of the cowl with the heated air exiting into the lower cowl. In temps below 20*F, I must partially close off the air to the cooler to keep the oil temp over 170*F. I typically see CHTs in the 390-400 range (hi-power cruise) and oil right at 180*F. Oil temps may rise to 190 in max power climbs and will rise to 200-210 in hi-power, lo-speed operation (in the pattern). I do not see these temps as a problem. Your oil temp sensor should be next to the Vernatherm. I have a friend with a COZY IV that runs an IO360 with cool CHTs and a hot oil problem. The symptom is a slowly rising oil temp in cruise - indicating that there is not quite enough cooling even though he has measured an adequate 5.5" H2O air pressure across the cooler. He is switching from a cheaper off-brand cooler to the same size Stewart-Warner because his research shows that the S-W is 20% more efficient than the off-brand. I will report his results - probably by the end of this weekend's testing. Scott Krueger Sky2high@aol.com II-P N92EX IO320 Aurora, IL (KARR) -------------------------------1063973044 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 9/18/2003 9:46:04 PM Central Daylight Time, sreeves@= sc.rr.com writes:

I have a Lycoming O-320 with a remote mounted=20= cooler (on the firewall).

Steve,

I am running an IO320 with a 7 vane (small) Stewart-Warner cooler mount= ed on the left firewall and fed by a large NACA duct on the side of the cowl= with the heated air exiting into the lower cowl. In temps below 20*F,= I must partially close off the air to the cooler to keep the oil temp over=20= 170*F.

I typically see CHTs in the 390-400 range (hi-power cruise) and oil rig= ht at 180*F. Oil temps may rise to 190 in max power climbs and will ri= se to 200-210 in hi-power, lo-speed operation (in the pattern). I do n= ot see these temps as a problem.

Your oil temp sensor should be next to the Vernatherm.

I have a friend with a COZY IV that runs an IO360 with cool CHTs and a=20= hot oil problem. The symptom is a slowly rising oil temp in cruise - i= ndicating that there is not quite enough cooling even though he has measured= an adequate 5.5" H2O air pressure across the cooler. He is switc= hing from a cheaper off-brand cooler to the same size Stewart-Warner because= his research shows that the S-W is 20% more efficient than the off-brand.&n= bsp; I will report his results - probably by the end of this weekend's testi= ng.

Scott Krueger
Sky2high@aol.com
II-P N92EX IO320 Aurora, IL (KARR)

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