X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-we0-f180.google.com ([74.125.82.180] verified) by logan.com (CommuniGate Pro SMTP 5.4.5) with ESMTPS id 5565944 for flyrotary@lancaironline.net; Tue, 29 May 2012 12:01:23 -0400 Received-SPF: pass receiver=logan.com; client-ip=74.125.82.180; envelope-from=msteitle@gmail.com Received: by weyt11 with SMTP id t11so2647701wey.25 for ; Tue, 29 May 2012 09:00:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=N5IPktuxUgQIaGe+PNu8/O22Qp+2fqVF/sD1WaOfad4=; b=RmPJycZdysH33HsOg+BWu5deBIpa4mXOX3QBQCHt+DtsM7JSJj4iA0fbD1ej1P2nnX b5EJJWzqrA8w6+Y4kfps2MNbf/CZt9G7ACzPnUgpmSRYxFfngPfxwoGJztOMwKDk2WK5 Z2hCosdWdBzGYPDrmghA4Ng0Wqd+CLX8yHhjE4JCb4hzah7Y3ah5SaspfFHT9WwFvraO pDZGPE10FgHt1jxBKA1i66+USbqZU3/8UhLoAJ8sn4Ej4l39mBvGQ29O3EFVLLwMZGoK C41KHB4p0heQjk6/Zv8IDtOpfV4UEqwOJsIel++NMgtSD80uCl06TDIZhabDFRXmCKpG Xf4g== MIME-Version: 1.0 Received: by 10.216.207.67 with SMTP id m45mr7882633weo.175.1338307247087; Tue, 29 May 2012 09:00:47 -0700 (PDT) Received: by 10.216.231.218 with HTTP; Tue, 29 May 2012 09:00:46 -0700 (PDT) In-Reply-To: References: Date: Tue, 29 May 2012 11:00:46 -0500 Message-ID: Subject: Re: [FlyRotary] Re: injector imbalance From: Mark Steitle To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0016e6d9a2d4101fe004c12ef0ba --0016e6d9a2d4101fe004c12ef0ba Content-Type: text/plain; charset=ISO-8859-1 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 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 > *Sent:* Tuesday, May 29, 2012 11:02 AM > *To:* Rotary motors in aircraft > *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 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 > --0016e6d9a2d4101fe004c12ef0ba Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Ed,=A0

That sounds easy enough to do. =A0I'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.

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=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
=A0
=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.
=A0
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).
=A0
The quickest was to see if that is the problem is= simply=20 to disconnect that aux lead to injector.
=A0
Ed

Sent: Tuesday, May 29, 2012 11:02 AM
Subject: [FlyRotary] Re: injector imbalance

Steve,=20

I almost understand what you'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'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't recall if this was done or not. =A0But this will be th= e next=20 thing I will check. =A0

Thanks,
Mark=A0

On Tue, May 29, 2012 at 9:47 AM, Steven W. Boese= <SBoese@uwyo.edu> wrote:

Mark,

=A0

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

=A0

Steve Boese
RV6A, 1986 13B NA, RD1A,=20 EC2

No virus found in this=20 message.
Checked by AVG - www.avg.com
Version: 2012.0.2178 / Virus=20 Database: 2425/5030 - Release Date: 05/29/12


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