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Date: Thu, 31 May 2012 10:48:18 -0500
Message-ID: <CAHh3jbPr3BSyx1yD9Qvxb7_4yE7SFvNxSxAV=PH3tjdVNL89Wg@mail.gmail.com>
Subject: Re: [FlyRotary] Re: Injector balancing
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Content-Type: multipart/alternative; boundary=0015175d0578295bd804c156ffa9

--0015175d0578295bd804c156ffa9
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Brian,

I agree...Two alternators gives you a nice warm feeling, especially when
flying over inhospitable terrain.  I've had to shut down one alternator
(X-feed to the other) more than once.  Two Geo Metro alternators together
weigh just slightly more than one RX-7 alternator.

Mark


On Thu, May 31, 2012 at 10:11 AM, <bktrub@aol.com> wrote:

> I've recently found that a 40 amp alternator is not sufficient to run a
> 13B  with electric fuel pumps and EFI. Seems the injectors take up a huge
> amount of amperage at higher rpms. I'm fine on the ground,- at about 13.7
> volts, but when I'm running 5-6000 rpm, my voltage starts dropping and
> stabilizes at a little below 12 volts after an hour of flying. I have two
> 18 AH batteries. I"ve got a Dynon D10, terra 250 Transponder, Xcom radio,
> EC2, EM2, and two fuel pumps from RWS. I only run one pump at a time except
> for takeoff and landing. Anyone know what the current draw for the
> injectors is at 6000 rpm?
>
> Looks like I need to add another alternator.
>
> Brian Trubee
>
>
>  -----Original Message-----
> From: Steven W. Boese <SBoese@uwyo.edu>
> To: Rotary motors in aircraft <flyrotary@lancaironline.net>
> Sent: Thu, May 31, 2012 6:45 am
> Subject: [FlyRotary] Re: Injector balancing
>
>  Mark,
>
> I would really encourage you to try Ed's suggestion of disconnecting any
> external devices from the fuel injector circuitry.  The fuel injectors are
> like any other solenoid device where the current required to hold it open
> is only a small fraction of the current required to open it in the first
> place.  The likelihood that the connection to the external device is only
> made to one injector would make this an even more useful thing to try.
>
>  Steve Boese
> RV6A, 1986 13B NA, RD1A, EC2
>
>
>

--0015175d0578295bd804c156ffa9
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Brian,=A0<div><br></div><div>I agree...Two alternators gives you a nice war=
m feeling, especially when flying over inhospitable terrain. =A0I&#39;ve ha=
d to shut down one alternator (X-feed to the other) more than once. =A0Two =
Geo Metro alternators together weigh just slightly more than one RX-7 alter=
nator. =A0<div>
<br></div><div>Mark<br><div><br><br><div class=3D"gmail_quote">On Thu, May =
31, 2012 at 10:11 AM,  <span dir=3D"ltr">&lt;<a href=3D"mailto:bktrub@aol.c=
om" target=3D"_blank">bktrub@aol.com</a>&gt;</span> wrote:<br><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;=
padding-left:1ex">
<font color=3D"black" face=3D"arial">
<div>I&#39;ve recently found that a 40 amp alternator is not sufficient to =
run a 13B =A0with electric fuel pumps and EFI. Seems the injectors take up =
a huge amount of amperage at higher rpms. I&#39;m fine on the ground,-=A0at=
 about 13.7 volts,=A0but when I&#39;m running 5-6000 rpm, my voltage starts=
 dropping and stabilizes at a little below 12 volts after an hour of flying=
. I have two 18 AH batteries. I&quot;ve got a Dynon D10, terra 250 Transpon=
der, Xcom radio, EC2, EM2, and two fuel pumps from RWS. I only run one pump=
 at a time except for takeoff and landing. Anyone know what the current dra=
w for the injectors is at 6000 rpm?</div>



<div>=A0</div>


<div>Looks like I need to add another alternator.</div>


<div>=A0</div>


<div>Brian Trubee<br>
<br>
<br>
</div>


<div style=3D"font-size:10pt;font-family:arial,helvetica"><div class=3D"im"=
>-----Original Message-----<br>
From: Steven W. Boese &lt;<a href=3D"mailto:SBoese@uwyo.edu" target=3D"_bla=
nk">SBoese@uwyo.edu</a>&gt;<br>
To: Rotary motors in aircraft &lt;<a href=3D"mailto:flyrotary@lancaironline=
.net" target=3D"_blank">flyrotary@lancaironline.net</a>&gt;<br>
Sent: Thu, May 31, 2012 6:45 am<br>
Subject: [FlyRotary] Re: Injector balancing<br>
<br>


</div><div class=3D"im"><div>



<div style=3D"direction:ltr;font-size:10pt;font-family:Tahoma">

<div>Mark,</div>


<div>=A0</div>


<div>I would really encourage you to try Ed&#39;s suggestion of disconnecti=
ng any external devices from the fuel injector circuitry.=A0 The fuel injec=
tors are like any other solenoid device where=A0the<a></a> current required=
 to hold it open is only a small fraction of the current required to open i=
t in the first place.=A0 The likelihood<a></a> that the=A0connection to the=
 external device is only made to one injector would=A0make this an even mor=
e useful thing to try.</div>



<div>

<div>=A0</div>


<div><font face=3D"Tahoma">

<div><font face=3D"tahoma">Steve Boese<a></a></font></div>


<div><font face=3D"tahoma"><a></a><font face=3D"tahoma">RV6A</font>, 1986=
=A013B<a></a> NA, RD1A<a></a>, EC2<a></a></font></div>
</font></div>
</div>


<div>=A0=A0=A0<br>
</div>
<br>
</div>
</div>
</div></div>
</font></blockquote></div><br></div></div></div>

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