Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Wed, 02 Mar 2005 11:34:13 -0500 Message-ID: X-Original-Return-Path: Received: from tomts5-srv.bellnexxia.net ([209.226.175.25] verified) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 766418 for lml@lancaironline.net; Wed, 02 Mar 2005 11:02:39 -0500 Received-SPF: none receiver=logan.com; client-ip=209.226.175.25; envelope-from=ian.crowe@sympatico.ca Received: from crowe ([69.159.74.163]) by tomts5-srv.bellnexxia.net (InterMail vM.5.01.06.10 201-253-122-130-110-20040306) with SMTP id <20050302160153.EDFE2988.tomts5-srv.bellnexxia.net@crowe> for ; Wed, 2 Mar 2005 11:01:53 -0500 X-Original-Message-ID: <001501c51f41$272d4260$65c4fea9@crowe> From: "Ian B. Crowe" X-Original-To: "Lancair Mailing List" Subject: LNC2 automotive alternator (14V) X-Original-Date: Wed, 2 Mar 2005 11:01:50 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0012_01C51F17.3C15AED0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0012_01C51F17.3C15AED0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable What is your failure mode? If it is the diode pack then it is most = likely that you need the cooling air to impinge directly on the diodes. = I have a 175 hours on an automotive alternator (70 amp) and no problems = so far. I am sorry but the model escapes me. But it was a rebuilt = model by a local rebuilder. Cost me a $100. You might also be trying to draw too much from the the alternator. 35 = amps is quite small and depending on your load you may be operating it = at the top end of its output. If you are frying the windings as a failure mode then you have a an = overload problem. You can adapt almost any small automotive alternator to fit. I have an = IO360 A3B6D and I had to change the bracketry. I also changed the = alternator pulley size. There is a large increase in speed when you = compare the ratio of the driving pulley to the driven. If your rotor = windings are failing due to becoming loose then you may have an = overspeed condition. Car engines can potentially rev faster but nowhere = do you see the difference in pulley sizes you see on an aircraft. Hope this helps Ian Crowe ------=_NextPart_000_0012_01C51F17.3C15AED0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

What is your failure mode? If it = is the diode=20 pack then it is most likely that you need the cooling air to impinge = directly on=20 the diodes. I have a 175 hours on an automotive alternator (70 = amp) and no=20 problems so far. I am sorry but the model escapes me. But it = was a=20 rebuilt model by a local rebuilder. Cost me a $100.

You might also be trying to draw too = much from the=20 the alternator. 35 amps is quite small and depending on your load = you may=20 be operating it at the top end of its output.

If you are frying the windings as a = failure mode=20 then you have a an overload problem.

You can adapt almost any small = automotive=20 alternator to fit. I have an IO360 A3B6D and I had to change the=20 bracketry. I also changed the alternator pulley size. There is a = large=20 increase in speed when you compare the ratio of the driving pulley to = the=20 driven. If your rotor windings are failing due to becoming loose = then you=20 may have an overspeed condition. Car engines can potentially rev = faster=20 but nowhere do you see the difference in pulley sizes you see on an=20 aircraft.

Hope this helps

Ian Crowe

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