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Date: Tue, 29 May 2012 11:00:46 -0500
Message-ID: <CAHh3jbMScdh-hks5bYsTX=ePH-u3qjNNbamETQ-CrMDaeVy1pg@mail.gmail.com>
Subject: Re: [FlyRotary] Re: injector imbalance
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Ed,

That sounds easy enough to do.  I'll check the BMA and see if I can find
the one wire that may be the cause of this issue.  Appreciate the help.

Mark

On Tue, May 29, 2012 at 10:18 AM, Ed Anderson <eanderson@carolina.rr.com>wrote:

> **
> Mark, it does not take much resistance to protect the injector from
> current draws by other devices.  I install a 200 ohm resistor between my
> EFISM and the driving injector.  That way at a nominal 12 volts - the most
> current the other device would  draw (if shorted to ground) is I = E/R =
> 12/200 = 60 ma (probably much less is the device is probably not a direct
> ground) not enough to pull your injector open.
>
>  I put it in there (as close to the injector as I could) so that if by
> chance my EFISM lead from the injector got shorted to ground it would not
> pull the injector open.
>
> The resistance is not critical, I have used from 100-500 ohms.  You could
> increase the resistance until your other device stopped working (and then
> reduce the resistance a bit from there).
>
> The quickest was to see if that is the problem is simply to disconnect
> that aux lead to injector.
>
> Ed
>
>  *From:* Mark Steitle <msteitle@gmail.com>
> *Sent:* Tuesday, May 29, 2012 11:02 AM
> *To:* Rotary motors in aircraft <flyrotary@lancaironline.net>
> *Subject:* [FlyRotary] Re: injector imbalance
>
> Steve,
>
> I almost understand what you're telling me.  Bill Shultz commented on the
> Blue Mountain EFIS using the #1 injector for RPM.  So, if the BMA EFIS is
> connected to the #1 injector lead, then it could be causing the over rich
> condition on that rotor.   I'm not sure if I did that or not as my BMA RPM
> indicator has never worked.  It has been many years since I installed the
> EFIS, so I don't recall if this was done or not.  But this will be the next
> thing I will check.
>
> Thanks,
> Mark
>
> On Tue, May 29, 2012 at 9:47 AM, Steven W. Boese <SBoese@uwyo.edu> wrote:
>
>>  Mark,
>>
>>
>>
>> If a device is connected to the EC2 side of the primary injector of rotor
>> 1 and this device has diode protection from the inductive spike produced by
>> the injector winding, then this injector will deliver more fuel than the
>> injector pulse width would indicate.  The appearance on the O-scope would
>> more evident in the lack of an inductive spike for this injector rather
>> than in a difference in the signal pulse width.
>>
>>
>>  Steve Boese
>> RV6A, 1986 13B NA, RD1A, EC2
>>
>
> No virus found in this message.
> Checked by AVG - www.avg.com
> Version: 2012.0.2178 / Virus Database: 2425/5030 - Release Date: 05/29/12
>

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Ed,=A0<div><br></div><div>That sounds easy enough to do. =A0I&#39;ll check =
the BMA and see if I can find the one wire that may be the cause of this is=
sue. =A0Appreciate the help.</div><div><br></div><div>Mark<br><br><div clas=
s=3D"gmail_quote">
On Tue, May 29, 2012 at 10:18 AM, Ed Anderson <span dir=3D"ltr">&lt;<a href=
=3D"mailto:eanderson@carolina.rr.com" target=3D"_blank">eanderson@carolina.=
rr.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"=
margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<u></u>



<div style=3D"PADDING-LEFT:10px;PADDING-RIGHT:10px;PADDING-TOP:15px" name=
=3D"Compose message area">
<div><font face=3D"Arial">Mark, it does not take much resistance to protect=
 the=20
injector from current draws by other devices.=A0 I install a 200 ohm resist=
or=20
between my EFISM and the driving injector.=A0 That way at a nominal 12 volt=
s=20
- the most current=A0the other device would=A0 draw (if shorted to ground)=
=20
is I =3D E/R =3D 12/200 =3D 60 ma (probably much less is the device is prob=
ably not a=20
direct ground)=A0not enough to pull your injector open.=A0</font></div>
<div><font face=3D"Arial"></font>=A0</div>
<div><font face=3D"Arial">=A0I put it in there (as close to the injector as=
 I=20
could) so that if by chance my EFISM lead from the injector got shorted to=
=20
ground it would not pull the injector open.</font></div>
<div><font face=3D"Arial"></font>=A0</div>
<div><font face=3D"Arial">The resistance is not critical, I have used from =
100-500=20
ohms.=A0 You could increase the resistance until your other device stopped=
=20
working (and then reduce the resistance a bit from there).</font></div>
<div><font face=3D"Arial"></font>=A0</div>
<div><font face=3D"Arial">The quickest was to see if that is the problem is=
 simply=20
to disconnect that aux lead to injector.</font></div>
<div><font face=3D"Arial"></font>=A0</div>
<div><font face=3D"Arial">Ed</font></div>
<div style=3D"FONT:10pt Tahoma">
<div><br></div>
<div style=3D"BACKGROUND:#f5f5f5">
<div><b>From:</b> <a title=3D"msteitle@gmail.com" href=3D"mailto:msteitle@g=
mail.com" target=3D"_blank">Mark Steitle</a> </div>
<div><b>Sent:</b> Tuesday, May 29, 2012 11:02 AM</div>
<div><b>To:</b> <a title=3D"mailto:flyrotary@lancaironline.net
CTRL + Click to follow link" href=3D"mailto:flyrotary@lancaironline.net" ta=
rget=3D"_blank">Rotary motors in aircraft</a> </div>
<div><b>Subject:</b> [FlyRotary] Re: injector imbalance</div></div></div><d=
iv><div class=3D"h5">
<div><br></div>Steve,=20
<div><br></div>
<div>I almost understand what you&#39;re telling me. =A0Bill Shultz comment=
ed on=20
the Blue Mountain EFIS using the #1 injector for RPM. =A0So, if the BMA EFI=
S=20
is connected to the #1 injector lead, then it could be causing the over ric=
h=20
condition on that rotor. =A0 I&#39;m not sure if I did that or not as my BM=
A RPM=20
indicator has never worked. =A0It has been many years since I installed the=
=20
EFIS, so I don&#39;t recall if this was done or not. =A0But this will be th=
e next=20
thing I will check. =A0</div>
<div><br></div>
<div>Thanks,</div>
<div>Mark=A0<br><br>
<div class=3D"gmail_quote">On Tue, May 29, 2012 at 9:47 AM, Steven W. Boese=
 <span dir=3D"ltr">&lt;<a href=3D"mailto:SBoese@uwyo.edu" target=3D"_blank"=
>SBoese@uwyo.edu</a>&gt;</span> wrote:<br>
<blockquote style=3D"BORDER-LEFT:#ccc 1px solid;MARGIN:0px 0px 0px 0.8ex;PA=
DDING-LEFT:1ex" class=3D"gmail_quote">
  <div>
  <div style=3D"FONT-FAMILY:Tahoma;DIRECTION:ltr;FONT-SIZE:10pt">
  <p>Mark,</p>
  <p>=A0</p>
  <p>If a device is connected to the EC2 side of the primary injector of ro=
tor 1=20
  and this device has diode protection from the inductive spike produced by=
 the=20
  injector winding, then this injector will deliver more fuel than the inje=
ctor=20
  pulse width would indicate.=A0 The appearance on the O-scope would more=
=20
  evident in the lack of an inductive spike for this injector rather than i=
n a=20
  difference in the signal=A0pulse width.=A0</p>
  <div>
  <p>=A0</p>
  <div><font face=3D"Tahoma">
  <div><font face=3D"tahoma">Steve Boese</font></div>
  <div><font face=3D"tahoma">RV6A, 1986 13B NA, RD1A,=20
  EC2</font></div></font></div></div></div></div></blockquote></div><br></d=
iv><a></a>
</div></div><p align=3D"left" color=3D"#000000">No virus found in this=20
message.<br>Checked by AVG - <a href=3D"http://www.avg.com" target=3D"_blan=
k">www.avg.com</a><br>Version: 2012.0.2178 / Virus=20
Database: 2425/5030 - Release Date: 05/29/12</p></div>
</blockquote></div><br></div>

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