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To: flyrotary@lancaironline.net
Subject: Re: [FlyRotary] Re: Injector balancing
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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 amou=
nt 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 stabilize=
s at a little below 12 volts after an hour of flying. I have two 18 AH batt=
eries. I"ve got a Dynon D10, terra 250 Transponder, Xcom radio, EC2, EM2, a=
nd two fuel pumps from RWS. I only run one pump at a time except for takeof=
f and landing. Anyone know what the current draw for the injectors is at 60=
00 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,
=20
I would really encourage you to try Ed's suggestion of disconnecting any ex=
ternal devices from the fuel injector circuitry.  The fuel injectors are li=
ke 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 t=
o one injector would make this an even more useful thing to try.

=20

Steve Boese
RV6A, 1986 13B NA, RD1A, EC2

  =20





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<font color=3D'black' size=3D'2' face=3D'arial'>
<div>I've recently found that a 40 amp alternator is not sufficient to run =
a 13B &nbsp;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,-&nbsp;at a=
bout 13.7 volts,&nbsp;but when I'm running 5-6000 rpm, my voltage starts dr=
opping 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, Xco=
m radio, EC2, EM2, and two fuel pumps from RWS. I only run one pump at a ti=
me except for takeoff and landing. Anyone know what the current draw for th=
e injectors is at 6000 rpm?</div>


<div>&nbsp;</div>


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


<div>&nbsp;</div>


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


<div style=3D"FONT-FAMILY: arial,helvetica; COLOR: black; FONT-SIZE: 10pt">=
-----Original Message-----<br>
From: Steven W. Boese &lt;SBoese@uwyo.edu&gt;<br>
To: Rotary motors in aircraft &lt;flyrotary@lancaironline.net&gt;<br>
Sent: Thu, May 31, 2012 6:45 am<br>
Subject: [FlyRotary] Re: Injector balancing<br>
<br>


<div id=3DAOLMsgPart_1_94bfd556-5703-4ec3-8a35-c523a4c03822>
<STYLE id=3DowaParaStyle>#AOLMsgPart_1_94bfd556-5703-4ec3-8a35-c523a4c03822=
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<div style=3D"FONT-FAMILY: Tahoma; DIRECTION: ltr; COLOR: #000000; FONT-SIZ=
E: 10pt">

<div>Mark,</div>


<div>&nbsp;</div>


<div>I would really encourage you to try Ed's suggestion of disconnecting a=
ny external devices from the fuel injector circuitry.&nbsp; The fuel inject=
ors are like any other solenoid device where&nbsp;the<A></A> current requir=
ed to hold it open is only a small fraction of the current required to open=
 it in the first place.&nbsp; The likelihood<A></A> that the&nbsp;connectio=
n to the external device is only made to one injector would&nbsp;make this =
an even more useful thing to try.</div>


<div>

<div>&nbsp;</div>


<div><FONT size=3D2 face=3DTahoma>

<div><FONT size=3D2 face=3Dtahoma>Steve Boese<A></A></FONT></div>


<div><FONT size=3D2 face=3Dtahoma><A></A><FONT size=3D2 face=3Dtahoma>RV6A<=
/FONT>, 1986&nbsp;13B<A></A> NA, RD1A<A></A>, EC2<A></A></FONT></div>
</FONT></div>
</div>


<div>&nbsp;&nbsp;&nbsp;<br>
</div>
<br>
</div>
</div>
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</font>
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