X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 03 Feb 2011 12:39:50 -0500 Message-ID: X-Original-Return-Path: Received: from mail-ww0-f50.google.com ([74.125.82.50] verified) by logan.com (CommuniGate Pro SMTP 5.4c2a) with ESMTPS id 4834878 for lml@lancaironline.net; Tue, 01 Feb 2011 21:04:48 -0500 Received-SPF: pass receiver=logan.com; client-ip=74.125.82.50; envelope-from=vonjet@gmail.com Received: by wwf26 with SMTP id 26so7170248wwf.7 for ; Tue, 01 Feb 2011 18:04:10 -0800 (PST) DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=rhaOu2YAUT8EYBRb6OhT0bpJAmxS2lxTqSy6+Pf/8e3UYm1h2FoBJs6G4p50LTN7IR 4InViHStxVCIc8AgpJDPtZd95DHHq5zjzJSQmlBOhAZYjbnzq12gxf2wD2Tk9b58pLqD hYUE38cvonc9lqX+3UMH+ilEptIgwr807p5oQ= MIME-Version: 1.0 Received: by 10.216.176.138 with SMTP id b10mr1307982wem.75.1296612248968; Tue, 01 Feb 2011 18:04:08 -0800 (PST) Received: by 10.216.10.205 with HTTP; Tue, 1 Feb 2011 18:04:08 -0800 (PST) In-Reply-To: References: X-Original-Date: Tue, 1 Feb 2011 18:04:08 -0800 X-Original-Message-ID: Subject: Re: [LML] Re: 360 Cooling From: Bryan Wullner X-Original-To: Lancair Mailing List Content-Type: multipart/alternative; boundary=0016367b61f682dd1c049b4310f5 --0016367b61f682dd1c049b4310f5 Content-Type: text/plain; charset=ISO-8859-1 I think I'm going to try the small lips on the bottom of the cowling at the exit. See if that does anything. Im not fully understanding what your saying about the bottom baffeling. Are you talking about the center peice that goes between each cyl on the bottom? Bryan On Tue, Feb 1, 2011 at 4:48 AM, randy snarr wrote: > Bryan, > Check the exits on the baffeling on the bottom of each cylinder. If memory > serves, there was a paper released by NASA with some cooling info on these > small engines. I thought it was 1.6" times the depth of the cooling fins for > the opening at the bottom of the cylinder. I remember going a little wider, > say 2" or so.. If they are a little too tight at the bottom, that can cause > cooling issues. I opened up mine a little and also rounded them off instead > of 90 deg bends. Also for the air inlets on the engine, you are better off > to have that be smooth with no steps. > It may be several issues not just one. There is also a test you can do with > the vernatherm. I took mine out, put it in oil and ran the temp up to 180 to > see if it would open.. > Mine did so I solved the issue with "other " items that others are > suggesting.. > One other item on the plennum, If it is too tight on the top of the engine, > you will never get effective cooling on the engine or oil cooler. I have > seen plennums built very close to the top of the engine and they dont work > like that. Mine is so close to the inside of the upper cowl, I marvel that > it has not rubbed off the paint. It is close which gives a better expansion > of the cooing air where you can build pressure to go down the cooling fins. > I would also put a shop light under the engine with the plennum off and > caulk with high temp RTV every crack and hole you can find with the light. > By sealing all that up tight, your cooling air has nowhere to go but through > the cooling fins to the bottom of the cowling.. I would do all of these > before I start cutting up the cowl.. I have also seen small curls on the > opening of the lower cowl lower temps. Believe it or not, outside air is > rushing in that opening at the bottom of the cowl. Look at every certifited > model with an opening in the cowl, they all have a louver of deflector to > create a wake so the outside flow air does not go in the opening... > Can you elaborate on how the plennum is set up and or provide some > pictures? > Sorry for blabbering... > Randy Snarr > > "Flight by machines heavier than air is unpractical and insignificant, if > not utterly impossible" > -Simon Newcomb, 1902 > > --- On *Mon, 1/31/11, bucky * wrote: > > > From: bucky > Subject: [LML] 360 Cooling > To: lml@lancaironline.net > Date: Monday, January 31, 2011, 6:17 AM > > > Bryan, > This is from the Lancair Mail Newsletter from years ago. I was having the > same problem with cooling. I have fuel injection and standard baffling. I > installed the additional exit air ducting, blocked off oil cooler intake at > #3 cyl. I Installed a 3" naca duct on bottom of cowling, routed a 3" scat > tube to the oil cooler which exits out the side with louvers. > There may be other fixes, but this worked for me. > > > > -----Inline Attachment Follows----- > > -- > For archives and unsub > http://mail.lancaironline.net:81/lists/lml/List.html > > > --0016367b61f682dd1c049b4310f5 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable I think I'm going to try the small lips on the bottom of the cowling at= the exit. See if that does anything.
Im not fully understanding what y= our saying about the bottom baffeling. Are you talking about the center pei= ce that goes between each cyl on the bottom?
Bryan

On Tue, Feb 1, 2011 at 4:48 AM= , randy snarr <randylsnarr@yahoo.com> wrote:
Bryan,
Check the exits on the baffelin= g on the bottom of each cylinder. If memory serves, there was a paper relea= sed by NASA with some cooling info on these small engines. I thought it was= 1.6" times the depth of the cooling fins for the opening at the botto= m of the cylinder. I remember going a little wider, say 2" or so.. If = they are a little too tight at the bottom, that can cause cooling issues. I= opened up mine a little and also rounded them off instead of 90 deg bends.= Also for the air inlets on the engine, you are better off to have that be = smooth with no steps.
It may be several issues not just one. There is also a test you can do with= the vernatherm. I took mine out, put it in oil and ran the temp up to 180 = to see if it would open..
Mine did so I solved the issue with "othe= r " items that others are suggesting..
One other item on the plennum, If it is too tight on the top of the engine, you will never get effective = cooling on the engine or oil cooler. I have seen plennums built very close = to the top of the engine and they dont work like that. Mine is so close to = the inside of the upper cowl, I marvel that it has not rubbed off the paint= . It is close which gives a better expansion of the cooing air where you ca= n build pressure to go down the cooling fins. I would also put a shop light= under the engine with the plennum off and caulk with high temp RTV every c= rack and hole you can find with the light. By sealing all that up tight, yo= ur cooling air has nowhere to go but through the cooling fins to the bottom= of the cowling.. I would do all of these before I start cutting up the cow= l.. I have also seen small curls on the opening of the lower cowl lower tem= ps. Believe it or not, outside air is rushing in that opening at the bottom= of the cowl. Look at every certifited model with an opening in the cowl, they all have a louver of deflector to create a wake so the outside = flow air does not go in the opening...
Can you elaborate on how the plen= num is set up and or provide some pictures?
Sorry for blabbering...
Randy Snarr

"Flight by machin= es heavier than air is unpractical and insignificant, if not utterly imposs= ible"
-Simon Newcomb, 1902

--- On Mon, 1/31/11, bu= cky <bwhittie= r@ltol.com> wrote:

From: bucky <bwhittier@ltol.com>
Subject: [LML] 360 Coolin= g
To: lml@lancairo= nline.net
Date: Monday, January 31, 2011, 6:17 AM
<= br>
=20 =20
Bryan,
This is from the Lancair Mail Newslett= er from years=20 ago. I was having the same problem with cooling. I have fuel injection and= =20 standard baffling. I installed the additional exit air ducting, blocked off= oil=20 cooler intake at #3 cyl. I=A0Installed a 3" naca duct on bottom of cow= ling,=20 routed a 3" scat tube to the oil cooler which exits out the side with = louvers.=20
There may be other fixes, but this wor= ked for=20 me.
=A0
=A0

-----I= nline Attachment Follows-----



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