X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 07 Feb 2011 12:31:57 -0500 Message-ID: X-Original-Return-Path: Received: from snt0-omc3-s30.snt0.hotmail.com ([65.55.90.169] verified) by logan.com (CommuniGate Pro SMTP 5.4c2a) with ESMTP id 4840987 for lml@lancaironline.net; Mon, 07 Feb 2011 11:10:49 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.55.90.169; envelope-from=gary21sn@hotmail.com Received: from SNT112-DS6 ([65.55.90.136]) by snt0-omc3-s30.snt0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Mon, 7 Feb 2011 08:10:12 -0800 X-Originating-IP: [24.216.248.63] X-Originating-Email: [gary21sn@hotmail.com] X-Original-Message-ID: X-Original-Return-Path: gary21sn@hotmail.com From: "Gary Edwards" X-Original-To: "Lancair Mailing List" References: Subject: Re: 360 Cooling X-Original-Date: Mon, 7 Feb 2011 08:10:01 -0800 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_01DA_01CBC69E.6C3D4C00" X-Priority: 3 In-Reply-To: X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V10.00.0079.0400 Seal-Send-Time: Mon, 7 Feb 2011 08:10:01 -0800 X-OriginalArrivalTime: 07 Feb 2011 16:10:12.0699 (UTC) FILETIME=[7FF672B0:01CBC6E1] This is a multi-part message in MIME format. ------=_NextPart_000_01DA_01CBC69E.6C3D4C00 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Bryan, To clarify Randy's baffling changes, there needs to be a certain minimum = of opening at the bottom of each the head/cylinder. The baffling as it = wraps around each cylinder/head needs to be tight; kept tight, but not = wrap around the bottom too far. This subject is a part in a book = written on speed and cooling mods for RV's from several years ago = (90's). I do not have the book, but read it. According to the tests = done in the book, opening up the space increases cooling efficiency to a = point, but opening them more than a certain amount does not increase the = cooling further. I made the changes, but in my case it was of no = benefit. Also, #3 cylinder has no fins at the back, so the baffling is tight = against the cylinder. Modifying the baffling in that area to allow air = movement thru may help that cylinder if it runs hotter than the rest. I = have seen the benefit of that mod on a 6 cylinder (not #3 of course). Gary Edwards LNC2 =20 ----- Original Message -----=20 From: randy snarr=20 To: lml@lancaironline.net=20 Sent: Sunday, February 06, 2011 3:04 PM Subject: [LML] Re: 360 Cooling Bryan, I am talking about the baffling that wraps around the cylinders. = IF they are too tight at the bottom you will run hot... I opened up mine a little and also rounded the exits so they are = not square. It helped.. Hope that helps some.. Randy Snarr N694RS "Flight by machines heavier than air is unpractical and = insignificant, if not utterly impossible" -Simon Newcomb, 1902 --- On Thu, 2/3/11, Bryan Wullner wrote: From: Bryan Wullner Subject: [LML] Re: 360 Cooling To: lml@lancaironline.net Date: Thursday, February 3, 2011, 10:39 AM I think I'm going to try the small lips on the bottom of the = cowling at the exit. See if that does anything.=20 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. =20 =20 ------=_NextPart_000_01DA_01CBC69E.6C3D4C00 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Bryan,
To clarify Randy's baffling changes, there needs to be a certain = minimum of=20 opening at the bottom of each the head/cylinder.  The baffling as = it wraps=20 around each cylinder/head needs to be tight; kept tight, but not wrap = around the=20 bottom too far.  This subject is a part in a book written on speed = and=20 cooling mods for RV's from several years ago (90's).  I do not = have=20 the book, but read it.  According to the tests done in the book,=20 opening up the space increases cooling efficiency to a point,=20 but opening them more than a certain amount does not increase = the=20 cooling further.  I made the changes, but in my case it was of no=20 benefit.
 
Also, #3 cylinder has no fins at the back, so the baffling is tight = against=20 the cylinder.  Modifying the baffling in that area to allow air = movement=20 thru may help that cylinder if it runs hotter than the rest.  = I have=20 seen the benefit of that mod on a 6 cylinder (not #3 of course).
 
Gary Edwards
LNC2   
----- Original Message -----
From: randy=20 snarr
Sent: Sunday, February 06, 2011 = 3:04=20 PM
Subject: [LML] Re: 360 = Cooling

Bryan,
I am talking about the baffling that = wraps=20 around the cylinders. IF they are too tight at the bottom  = you will=20 run hot...
I opened up mine a little and also rounded the = exits so=20 they are not square.
It helped..
Hope that helps = some..
Randy=20 Snarr
N694RS

"Flight by=20 machines heavier than air is unpractical and insignificant, if = not=20 utterly impossible"
-Simon Newcomb, 1902

--- On = Thu,=20 2/3/11, Bryan Wullner <vonjet@gmail.com> = wrote:

From:=20 Bryan Wullner <vonjet@gmail.com>
Subject: [LML] Re: = 360=20 Cooling
To: lml@lancaironline.net
Date: Thursday, = February 3,=20 2011, 10:39 AM

I think I'm going to try the small lips = on the=20 bottom of the cowling at the exit. See if that does anything.=20
Im not fully understanding what your saying about the = bottom=20 baffeling. Are you talking about the center peice that goes = between=20 each cyl on the bottom?
Bryan

On Tue, Feb 1, 2011 at = 4:48 AM,=20 randy snarr <randylsnarr@yahoo.com>=20 wrote:
Bryan,
Check the exits on the baffeling = on the=20 bottom of each cylinder. If memory serves, there was a = paper=20 released by NASA with some cooling info on these small = engines. I thought it was 1.6" times the depth of the = cooling=20 fins for the opening at the bottom of the cylinder. I = remember=20 going a little wider, say 2" or so.. If they are a = little too=20 tight at the bottom, that can cause cooling issues. I = opened=20 up mine a little and also rounded them off instead of = 90 deg=20 bends. Also for the air inlets on the engine, you are = better=20 off to have that be smooth with no=20 = steps.



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