Return-Path: Received: from [24.25.9.101] (HELO ms-smtp-02-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 382116 for flyrotary@lancaironline.net; Sat, 28 Aug 2004 09:10:01 -0400 Received-SPF: none receiver=logan.com; client-ip=24.25.9.101; envelope-from=eanderson@carolina.rr.com Received: from EDWARD (cpe-069-132-183-211.carolina.rr.com [69.132.183.211]) by ms-smtp-02-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i7SD9SNs002096 for ; Sat, 28 Aug 2004 09:09:29 -0400 (EDT) Message-ID: <001701c48d00$4295b380$2402a8c0@EDWARD> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Engine run Date: Sat, 28 Aug 2004 09:09:32 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0014_01C48CDE.BB520700" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0014_01C48CDE.BB520700 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageAl, if the wiring of your injector switches are to Tracy's = diagram, then any time you turn off either set of injectors (staged of = not) the other pair will come on (unless. of course. their switch is = also in the OFF position). When only a single pair are working above = the stage point the injector duration is doubled (to make up for the = pair not injecting). =20 I had similar symptoms that about drove me batty. The engine simply = acted as if it were too rich at low rpms and the secondaries were on = below the point they should have been. If I leaned it out enough to cure = this problem, the high end would be too lean. This WILL happen IF the pressure sensor is not seeing manifold = pressure. In my case, I though I had pushed the manifold hoses on the = barbs of the sensors but in reality had apparently shoved them between = some board components. But, for whatever reason, if the manifold pressure is not present at the = sensor - then you are staged! I have not asked but presume you have tried the "B" controller. In my = case, it made no difference because neither pressure sensor were sensing = manifold pressure. But, if one is connected then switch controllers = should make a difference (if this is the problem). Ed Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ----- Original Message -----=20 From: Al Gietzen=20 To: Rotary motors in aircraft=20 Sent: Saturday, August 28, 2004 1:47 AM Subject: [FlyRotary] Re: Engine run I guess I didn't realize that the secondaries would turn on below the = staging point, but the thing that puzzles me is that turning off the = secondaries reduced the rpm and made it rougher. So apparently they = were on even thought the MAP reading was 13.1. Something fishy.=20 That is fishy alright. Might be a good time to go through the = injector and switch wiring again. =20 Good luck, Yeah, but these are the same wiring harnesses, connected the same way = as on the dyno - and it worked fine there. OK; its worth some further = checking. It is always something you least expect. Al ------=_NextPart_000_0014_01C48CDE.BB520700 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Al, if the wiring of your injector = switches are to=20 Tracy's diagram, then any time you turn off either set of injectors = (staged of=20 not) the other pair will come on (unless. of course. their switch is = also in the=20 OFF position).  When only a single pair are working above the stage = point=20 the injector duration is doubled (to make up for the pair not=20 injecting).  
 
I had similar symptoms that about drove = me=20 batty.  The engine simply acted as if it were too rich at low rpms = and the=20 secondaries were on below the point they should have been. If I = leaned it=20 out enough to cure this problem, the high end would be too = lean.
 
 This WILL happen IF the pressure = sensor is=20 not seeing manifold pressure.  In my case, I though I had pushed = the=20 manifold hoses on the barbs of the sensors but in reality had apparently = shoved=20 them between some board components.
 
But, for whatever reason, if the = manifold pressure=20 is not present at the sensor - then you are staged!
 
I have not asked but presume you have = tried the "B"=20 controller.  In my case, it made no difference because neither = pressure=20 sensor were sensing manifold pressure.  But, if one is  = connected then=20 switch controllers should make a difference (if this is the=20 problem).
 
 
Ed
 
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From:=20 Al = Gietzen=20
Sent: Saturday, August 28, 2004 = 1:47=20 AM
Subject: [FlyRotary] Re: Engine = run

I guess = I didn=92t=20 realize that the secondaries would turn on below the staging point, = but the=20 thing that puzzles me is that turning off the secondaries reduced the = rpm and=20 made it rougher.  So apparently they were on even thought the MAP = reading=20 was 13.1.  Something fishy. 

That is = fishy=20 alright.  Might be a good time to go through the injector and = switch=20 wiring again.  

Good=20 luck,

Yeah, but = these are=20 the same wiring harnesses, connected the same way as on the dyno =96 = and it=20 worked fine there.  OK; its worth some further checking.  It = is=20 always something you least expect.

Al

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