X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf18aec.mail.bellsouth.net ([205.152.59.66] verified) by logan.com (CommuniGate Pro SMTP 5.0.6) with ESMTP id 931468 for flyrotary@lancaironline.net; Wed, 18 Jan 2006 11:41:41 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.66; envelope-from=atlasyts@bellsouth.net Received: from ibm61aec.bellsouth.net ([68.213.226.209]) by imf18aec.mail.bellsouth.net with ESMTP id <20060118162828.OYLM6687.imf18aec.mail.bellsouth.net@ibm61aec.bellsouth.net> for ; Wed, 18 Jan 2006 11:28:28 -0500 Received: from [192.168.0.103] (really [68.213.226.209]) by ibm61aec.bellsouth.net with ESMTP id <20060118162827.YAEJ29167.ibm61aec.bellsouth.net@[192.168.0.103]> for ; Wed, 18 Jan 2006 11:28:27 -0500 Mime-Version: 1.0 (Apple Message framework v746.2) In-Reply-To: References: Content-Type: multipart/alternative; boundary=Apple-Mail-6-380709887 Message-Id: <3CACD06C-A02A-41F8-BCA7-8032D317BDA0@bellsouth.net> From: Buly Subject: Re: [FlyRotary] LS1 coil failures Date: Wed, 18 Jan 2006 11:28:19 -0500 To: "Rotary motors in aircraft" X-Mailer: Apple Mail (2.746.2) --Apple-Mail-6-380709887 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=WINDOWS-1252; delsp=yes; format=flowed I wander if vibration has to do something with it, since they are =20 mounted on the engine? I mounted mine on the firewall. Buly http://tinyurl.com/dcy36 On Jan 18, 2006, at 10:39 AM, Al Gietzen wrote: > Subject: [FlyRotary] Re: Coil & Alt cooling, Buly's input shaft > > > I'm wondering if 180f under hood is really the main cause for coil =20 > fail? Auto's shut off hot in desert, black steel hood, must see =20 > temps way beyond anything we can throw at them. You can't get those =20= > puppies to fail regardless of environment. Perhaps there are one or =20= > two other significant causes. I'd be real quick to abandon that =20 > manufacturer. > > > There are coils; and then there are coils with built-in solid state =20= > components like the LS1. Still, you=92d expect these components to =20= > be good to about 150C (300F). The alternator of course also has =20 > solid-state components in the rectifier circuit. Makes you wonder =20 > why Tracy=92s coils are failing, and not the alternator. > > > This issue is of definite interest to me as the LS1 coils on my 20B =20= > are in a similar setup as Tracy=92s. My coils are in the path of the =20= > exit air from the radiator. I have assumed that air would =20 > typically be about 150F or less. Won=92t know until this thing flies. > > > Al > > --Apple-Mail-6-380709887 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=WINDOWS-1252 I wander if vibration has to do = something with it, since they are mounted on the engine? I mounted mine = on the firewall.
http://tinyurl.com/dcy36
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On Jan = 18, 2006, at 10:39 AM, Al Gietzen wrote:

[FlyRotary] Re: Coil & Alt cooling, Buly's = input shaft

I'm wondering if 180f under hood is = really the main cause for coil fail? Auto's shut off hot in desert, = black steel hood, must see temps way beyond anything we can throw at = them. You can't get those puppies to fail regardless of environment. = Perhaps there are one or two other significant causes. I'd be real quick = to abandon that manufacturer.

=A0

There are coils; and = then there are coils with built-in solid state components like the LS1. = =A0Still, you=92d expect these components to be good to about 150C = (300F).=A0 The alternator of course also has solid-state components in = the rectifier circuit.=A0 Makes you wonder why = Tracy=92s coils are failing, and not the = alternator.

This issue is of definite interest to me as the LS1 coils = on my 20B are in a similar setup as Tracy=92s.=A0 My coils are in the path of the exit air from the = radiator. =A0I have assumed that air would typically be about 150F or = less.=A0 Won=92t know until this thing = flies.

Al



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