X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost01.isp.att.net ([207.115.11.51] verified) by logan.com (CommuniGate Pro SMTP 5.2.14) with ESMTP id 3756338 for flyrotary@lancaironline.net; Mon, 13 Jul 2009 19:50:47 -0400 Received-SPF: pass receiver=logan.com; client-ip=207.115.11.51; envelope-from=bbradburry@bellsouth.net Received: from desktop (adsl-146-126-224.mco.bellsouth.net[72.146.126.224]) by isp.att.net (frfwmhc01) with SMTP id <20090713235010H01009met6e>; Mon, 13 Jul 2009 23:50:10 +0000 X-Originating-IP: [72.146.126.224] From: "Bill Bradburry" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] cold switch and injector backup mode Date: Mon, 13 Jul 2009 19:50:12 -0400 Message-ID: <5EFC08A3431E45E197088FD1F7226F1F@Desktop> MIME-Version: 1.0 Content-Type: multipart/related; boundary="----=_NextPart_000_0018_01CA03F3.2310A4B0" X-Mailer: Microsoft Office Outlook 11 Thread-Index: AcoECNTNxLxchtMxQk6ga0drSRJOqwACdApw X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18049 This is a multi-part message in MIME format. ------=_NextPart_000_0018_01CA03F3.2310A4B0 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0019_01CA03F3.2310A4B0" ------=_NextPart_001_0019_01CA03F3.2310A4B0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Steve, If I understand your observations.embedded below. Bill B _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of sboese Sent: Monday, July 13, 2009 6:24 PM To: Rotary motors in aircraft Subject: [FlyRotary] cold switch and injector backup mode This weekend I had a chance to make some observations concerning the previous discussion on the use of the cold switch and the injector backup mode on my EC2 used with a 13B. When idling, turning on the cold switch results in all four injectors delivering fuel at the pulse width that was used by the primary injectors before the cold switch was turned on. Below staging manifold pressure, cold start doubles fuel flow by turning on both sets of injectors, effectively canceling staging. When idling, turning on the cold switch results in the staging data bit changing from indicating operation at MAP below the staging threshold to operation above the staging threshold even though the MAP is very low. When staging is canceled by the cold start switch, it is indicated on the EM-2 With the cold switch on, gradually increasing MAP results in a gradually increasing injector pulse width from idle to full throttle with no discontinuity when the staging threshold is crossed. Cold start has no effect on the fuel delivery after the normal staging point has been reached. Turning off the power to either the primary or secondary injectors has no effect on the pulse width applied to the injectors or the status of the staging data bit. The injector disable does not work above the staging point. If you kill one set above the staging manifold pressure, you will just be running on one set at the normal pulse width. This will result in only half power or less available anywhere above the staging point manifold pressure. This does not sound like the way I had previously understood the injector disable to work. Are you sure you have it wired correctly? Based on the above observations, it appears that the EC2 does not need to know whether or not power is being sent to the injectors. Regardless of the MAP at the time, turning on the cold switch results in the EC2 operating with all four injectors as if the MAP was above the staging threshold but with a pulse width appropriate for only two injectors being used. My statements below concerning the cold switch position appear to be in error. The position of the Cold Switch is not one of the things contained in the data log captured from the EC2 so that piece of data was from my memory which is poor at best. Sorry Bob. I probably should have maintained the "Avoid reading.." subject line. Steve Boese From: Steven Boese Subject: RE: [FlyRotary] Re: Below staging Date: Mon, 6 Jul 2009 00:24:28 -0600 To: "'Rotary motors in aircraft'" Message Header Undecoded Message Bob, In contrast to when the primary injector power is off, when the secondary injectors are turned off and the cold switch on, the EC2 indicates staging is taking place normally at the staging threshold, in my case at about 20 inches MAP. The engine doesn't go lean after staging is indicated, however. When idling with the secondary injectors turned off and the cold switch on, the EC2 indicates no staging has taken place. Of course, what the EC2's staging data bit is telling the outside world and what The EC2 is actually doing may be two different things. Steve Boese ------=_NextPart_001_0019_01CA03F3.2310A4B0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Steve,

 <= /p>

If I understand your = observations…embedded below.

 

=

Bill = B

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of sboese
Sent: Monday, July 13, = 2009 6:24 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] cold = switch and injector backup mode

This weekend I had a chance to make some observations concerning the previous discussion on the use of the cold switch and the injector backup mode on my EC2 used with a = 13B.

 

When idling, turning on the cold switch results in = all four injectors delivering fuel at the pulse width that was used by the = primary injectors before the cold switch was turned = on. 

Below staging manifold pressure, = cold start doubles fuel flow by turning on both sets of injectors, = effectively canceling staging.

 

=

When idling, turning on the cold switch results in = the staging data bit changing from indicating operation at MAP below the = staging threshold to operation above the staging threshold even though the MAP = is very low.

When staging is canceled by the = cold start switch, it is indicated on the EM-2

 

=

With the cold switch on, gradually increasing MAP = results in a gradually increasing injector pulse width from idle to full throttle = with no discontinuity when the staging threshold is = crossed.

Cold start has no effect on the = fuel delivery after the normal staging point has been = reached.

 

=

Turning off the power to either the primary or = secondary injectors has no effect on the pulse width applied to the injectors or = the status of the staging data bit.

The injector disable does not work = above the staging point.  If you kill one set above the staging manifold pressure, you will just be running on one set at the normal pulse = width.  This will result in only half power or less available anywhere above the = staging point manifold pressure.

This does not sound like the way I = had previously understood the injector disable to work.  Are you sure = you have it wired correctly?

 

=

Based on the above observations, it appears that the = EC2 does not need to know whether or not power is being sent to the injectors.  Regardless of the MAP at the time, turning on the cold = switch results in the EC2 operating with all four injectors as if the MAP was = above the staging threshold but with a pulse width appropriate for only two = injectors being used.

 

My statements below concerning the cold switch = position appear to be in error.  The position of the Cold Switch is not one = of the things contained in the data log captured from the EC2 so that piece of = data was from my memory which is poor at best.  Sorry = Bob.

 

I probably should have maintained the “Avoid reading….” subject line.

 

Steve Boese

 

From:

Steven Boese = <sboese@uwyo.edu>

Subject:

RE: [FlyRotary] Re: Below = staging

Date:

Mon, 6 Jul 2009 00:24:28 = -0600

To:

"'Rotary motors in aircraft'" = <flyrotary@lancaironline.net>

3D"Message

3D"Undecoded


Bob,

In contrast to when the primary = injector power is off, when the
secondary injectors are turned off and = the cold switch on, the EC2
indicates staging is taking place = normally at the staging threshold, in
my case at about 20 inches MAP. The = engine doesn't go lean after
staging is indicated, however. When = idling with the secondary injectors
turned off and the cold switch on, the = EC2 indicates no staging has
taken place. Of course, what the EC2's = staging data bit is telling the
outside world and what The EC2 is = actually doing may be two different
things.

Steve = Boese

 

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