X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao105.cox.net ([68.230.241.41] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2431444 for flyrotary@lancaironline.net; Wed, 24 Oct 2007 18:29:32 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.41; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao105.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20071024222854.NMKG1402.fed1rmmtao105.cox.net@fed1rmimpo02.cox.net> for ; Wed, 24 Oct 2007 18:28:54 -0400 Received: from BigAl ([72.192.143.193]) by fed1rmimpo02.cox.net with bizsmtp id 4NUu1Y0014AaN600000000; Wed, 24 Oct 2007 18:28:54 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: LS1 coils Date: Wed, 24 Oct 2007 15:30:32 -0800 Message-ID: <000001c81695$df2dad70$6401a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C81652.D10A6D70" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C81652.D10A6D70 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable =20 I think I noticed one of the D581 type have weak spark shortly before complete failure. I am still using three of the D581's just to proove = to myself that it was a heat problem that caused several failures before I = put a cooling plenum around them. =20 =20 I have heard no reports of the D580 type failing (even without a = cooling plenum) but I still recommend an enclosure with a supply of cool air to them. We are pushing them pretty hard in aircraft use. =20 My coils are mounted on top of the engine where the temps are typically about 140 -150F range, and have operated there for about 60 hours. = Early in the test program I did not have an aux fan on the in-cowl rad, and I=92m = sure the temps after shutdown went higher. I now leave the aux fan run for awhile after shutdown. =20 On testing them the other day using mode 8, all 6 still jump a spark 1 = =BC=94+. I was concerned earlier when I had checked than while cranking with the starter, and it was hard to getting more than 1/8=94 jump. Have no = problems starting, but it seems the output is quite sensitive to voltage; and may = be among the first reasons for loss of power following an alternator = failure. =20 I guess I have D580=92s, but I don=92t know what the difference is from = a D581. =20 Al G ------=_NextPart_000_0001_01C81652.D10A6D70 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I think I noticed one of the D581 type have = weak spark shortly before complete failure. I am still using three of the = D581's just to proove to myself that it was a heat problem that caused several failures before I put a cooling plenum around them. =

I have heard no reports of the D580 = type failing (even without a cooling plenum) but I still recommend an enclosure with = a supply of cool air to them. We are pushing them pretty hard in = aircraft use.

My coils are mounted on top of = the engine where the temps are typically about 140 -150F range, and have = operated there for about 60 hours.=A0 Early in the test program I did not have an = aux fan on the in-cowl rad, and I’m sure the temps after shutdown went = higher.=A0 I now leave the aux fan run for awhile after shutdown.

On testing them the other day = using mode 8, all 6 still jump a spark 1 =BC”+.=A0 I was concerned earlier = when I had checked than while cranking with the starter, and it was hard to getting = more than 1/8” jump.=A0 Have no problems starting, but it seems the = output is quite sensitive to voltage; and may be among the first reasons for loss = of power following an alternator failure.

I guess I have D580’s, but = I don’t know what the difference is from a D581.

Al G

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