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Date: Tue, 1 Jul 2008 07:29:18 -0700 (PDT)
From: thomas walter <roundrocktom@yahoo.com>
Reply-To: roundrocktom@yahoo.com
Subject: Re: Saga progress
To: flyrotary@lancaironline.net
In-Reply-To: <list-2999030@logan.com>
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Chris,
=A0
Generally there is a 'saturated current level' for ignition coils.
=A0
The electronics will let the coil ramp up to a given current, then hold tha=
t current level. At low rpm there is a longer dwell (coil turned on) compar=
ed to higher rpms (less on time).=A0 Since no one else has reported the iss=
ue I'm thinking there maybe a wiring or back feed problem.=A0 It is simple =
to look at with a "clamp on current probe" attached to oscilloscope, but no=
t a common tool for most folks to have available.=A0=A0 If you know of any =
automotive techs around the hanger, just ask and if someone has one they wi=
ll most likely speak up!
=A0
Tom
(digest mode, so I'm a day late on the replies... )


--- On Tue, 7/1/08, Rotary motors in aircraft <flyrotary@lancaironline.net>=
 wrote:


 1) Saga progress
    by "Christopher Barber" CBarber@TexasAttorney.net=20

=A0
Ok, here is the problem though.=A0=A0A question for the more electrically s=
avvy.=A0 When I get the engine to a low/very low idle I am tripping the coi=
l circuit breaker.=A0 It does not seem to be a problem at mid idle to high =
RPM. It has been consistent.=A0 I don't even know where to start. Thoughts =
please.
=A0=0A=0A=0A      
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<table cellspacing='0' cellpadding='0' border='0' ><tr><td valign='top' style='font: inherit;'><P>Chris,</P>
<P>&nbsp;</P>
<P>Generally there is a 'saturated current level' for ignition coils.</P>
<P>&nbsp;</P>
<P>The electronics will let the coil ramp up to a given current, then hold that current level. At low rpm there is a longer dwell (coil turned on) compared to higher rpms (less on time).&nbsp; Since no one else has reported the issue I'm thinking there maybe a wiring or back feed problem.&nbsp; It is simple to look at with a "clamp on current probe" attached to oscilloscope, but not a common tool for most folks to have available.&nbsp;&nbsp; If you know of any automotive techs around the hanger, just ask and if someone has one they will most likely speak up!</P>
<P>&nbsp;</P>
<P>Tom</P>
<P>(digest mode, so I'm a day late on the replies... )</P>
<P><BR><BR>--- On <B>Tue, 7/1/08, Rotary motors in aircraft <I>&lt;flyrotary@lancaironline.net&gt;</I></B> wrote:<BR></P>
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px solid"><PRE>
 1) Saga progress
    by "Christopher Barber" <A href="mailto:CBarber@TexasAttorney.net">CBarber@TexasAttorney.net</A><FONT face=Arial size=2> </FONT></PRE>
<DIV id=yiv1264491371>
<DIV>&nbsp;</DIV>
<DIV><FONT face=Arial size=2>Ok, here is the problem though.&nbsp;&nbsp;A question for the more electrically savvy.&nbsp; When I get the engine to a low/very low idle I am tripping the coil circuit breaker.&nbsp; It does not seem to be a problem at mid idle to high RPM. It has been consistent.&nbsp; I don't even know where to start. Thoughts please.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT>&nbsp;</DIV></DIV></BLOCKQUOTE></td></tr></table><br>



      
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