Return-Path: Received: from [24.25.9.101] (HELO ms-smtp-02-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2b5) with ESMTP id 143249 for flyrotary@lancaironline.net; Mon, 07 Jun 2004 16:13:17 -0400 Received: from EDWARD (clt25-78-058.carolina.rr.com [24.25.78.58]) by ms-smtp-02-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i57KChNs018656 for ; Mon, 7 Jun 2004 16:12:45 -0400 (EDT) Message-ID: <004601c44ccb$cea972a0$2402a8c0@EDWARD> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: LS1 Coils - amp draw? Date: Mon, 7 Jun 2004 16:12:49 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0043_01C44CAA.47635520" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0043_01C44CAA.47635520 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Mark, I think Tracy indicated that happens in the few milliseconds before = the EC2 has properly determined the Dwell time for the coils. If you = are not using an EC2 but the automobile's ECU that condition may not = arise. For instance I could see them having a RAM constant with a = "Start Up" dwell value that might be used for starting or until their = ECU is up to steam calculating away. You might find that your coils do use more than one of the 10 amp fuses, = but on the other hand Tracy indicated that the normal working current = drain is much less than 9 amps. Ed Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ----- Original Message -----=20 From: Mark Steitle=20 To: Rotary motors in aircraft=20 Sent: Monday, June 07, 2004 12:46 PM Subject: [FlyRotary] Re: LS1 Coils - amp draw? Seems to me that we might have made a wrong assumption somewhere. I = have an LS1 in my '99 Chevy pickup with eight of these coils. I just = went out and checked the fuse panel. It has three ignition fuses, each = 10A. I don't have a shop manual to check the schematic, but I've never = had an ignition fuse blow, and they are only 10A. Logic would reason = that only one of these circuits powers the coils. So, 10A for 8 coils. = What's wrong here? Should I really design for 9A for each coil? =20 Mark S. At 12:24 PM 6/7/2004 -0400, you wrote: Hi Al, I'm interested in Tracy's thoughts on this too. He said the high = current is only during startup, but if my fuse was accurate, then I drew = > 15A at 5000 ft in cruise with 2 coils.=20 I think I'll be OK at 20A and 16G wire, but .... Regards, John Slade =20 ------=_NextPart_000_0043_01C44CAA.47635520 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Mark,
 
    I think Tracy = indicated that=20 happens in the few milliseconds before the EC2 has properly determined = the Dwell=20 time for the coils.  If you are not using an EC2 but the = automobile's ECU=20 that condition may not arise.  For instance I could see them having = a RAM=20 constant with a "Start Up" dwell value that might be used for starting = or until=20 their ECU is up to steam calculating away.
 
You might find that your coils do use = more than one=20 of the 10 amp fuses, but on the other hand Tracy indicated that the = normal=20 working current drain is much less than 9 amps.
 
Ed
 
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From:=20 Mark=20 Steitle
Sent: Monday, June 07, 2004 = 12:46=20 PM
Subject: [FlyRotary] Re: LS1 = Coils - amp=20 draw?

Seems to me that we might have made a wrong assumption=20 somewhere.  I have an LS1 in my '99 Chevy pickup with eight of = these=20 coils.  I just went out and checked the fuse panel.  It has = three=20 ignition fuses, each 10A.  I don't have a shop manual to check = the=20 schematic, but I've never had an ignition fuse blow, and they are only = 10A.  Logic would reason that only one of these circuits powers = the=20 coils.  So, 10A for 8 coils. What's wrong here?  Should I = really=20 design for 9A for each coil?   

Mark = S.


At=20 12:24 PM 6/7/2004 -0400, you wrote:
Hi=20 Al,
I'm interested in Tracy's thoughts on = this too.=20 He said the high current is only during startup, but if my fuse was=20 accurate, then I drew > 15A at 5000 ft in cruise with 2 coils.=20
I think I'll be OK at 20A and 16G wire, = but=20 ....
Regards,
John = = Slade
 
 
------=_NextPart_000_0043_01C44CAA.47635520--