X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from poplet2.per.eftel.com ([203.24.100.45] verified) by logan.com (CommuniGate Pro SMTP 5.2.15) with ESMTP id 3767854 for flyrotary@lancaironline.net; Tue, 21 Jul 2009 17:58:58 -0400 Received-SPF: none receiver=logan.com; client-ip=203.24.100.45; envelope-from=lendich@aanet.com.au Received: from sv1-1.aanet.com.au (sv1-1.per.aanet.com.au [203.24.100.68]) by poplet2.per.eftel.com (Postfix) with ESMTP id 991741737C4 for ; Wed, 22 Jul 2009 05:58:20 +0800 (WST) Received: from ownerf1fc517b8 (203.171.92.134.static.rev.aanet.com.au [203.171.92.134]) by sv1-1.aanet.com.au (Postfix) with SMTP id 0E9FABEC00E for ; Wed, 22 Jul 2009 05:58:19 +0800 (WST) Message-ID: From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Erratic MP display Date: Wed, 22 Jul 2009 07:58:23 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000F_01CA0AA2.2FDD6A60" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5512 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-Antivirus: avast! (VPS 090721-0, 07/21/2009), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_000F_01CA0AA2.2FDD6A60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Don, I don't know what the 1/16" tube is doing, I guess restricting pulses, = but I would take that out and opt for a larger than 3/4" tube. Maybe as = large as 1.5" accumulator. George (down under)=20 List and Tracy, Now that I have gotten the pulsations from the intake manifold = back to the EC-2 dampened out, I'm getting about 200 RPM more running = static. About 6080 rpm now. My MP display on the EM-2 always bounced = around a lot, but the engine ran pretty well lately. I could only get = 2250 or so on climb out, 65 degree day, 5000 ft field elev, so I knew I = was not getting full power. I haven't flow since this change. I figure = that since the EC-2 runs almost entirely off the Manifold pressure the = pulsations where telling the computer to change to differant MAP = addresses that didn't correspond to the RPM and what the engine was = doing, or trying to do. Now with everthing much more coordinated, the = engine is running stronger. I accomplished this by restricting the = lines going back to the EC-2 with 1/16 inch plastic tube inside the = vacuum lines and adding an accumulator (3/4 inch tubing) downstream = that is packed with green nylon scrubby material to further dampen. One = more of hundreds of projects done. More to go. Now for my next project. My MP display on the EM-2 is not steady. = Right now with a closed hanger, engine off, no wind and all electrics = off, except the EC-2 and the EM-2, the MP bounces around. The average = is about 24.7. But it jumps around randomly. 24.9, then 24.6, then = 24.8 then 24.9, then 24.3 then 25.1 then 24.6 then as high as 25.3. = You get the idea. I have been told that others, when in this condition, = the MP is rock steady. The same for when they are running at a steady = throttle setting. That's what I think I should be getting too. I also = get this same thing happening when the engine is running at all steady = throttle settings. It happens on both controllers. In the past, I just = figured that this was normal, or close enough as there were so many = other more important things to work on, but with the improvement in RPM = with dampening, I'm thinking it is not. With the dampening, the display = is not bouncing around as much. I don't know what it was as I didn't = keep track. I would really like to have this airplane as right as = possible and I'm getting close. Now I am working on fiber glass to = permantly inprove cooling, waiting for new injector wire clips so I can = install the 86/87 550cc injectors and then of course, remapping. and a = few other things. So this would be an excellent time to also do what = ever is needed to make the MP steady and make this rotary installation = as perfect as possible. Your thoughts as always appreciated. Don Walker N113BR, RV-8 Renesis, EM-2, EC-2 Catto 76/88 3.5 hours Phase 1 in the pattern only=20 =20 ------=_NextPart_000_000F_01CA0AA2.2FDD6A60 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Don,
I don't know what the 1/16" tube is = doing, I guess=20 restricting pulses, but I would take that out and opt for a larger than = 3/4"=20 tube. Maybe as large as 1.5" accumulator.
George (down under) 
List and Tracy,
    Now that I have = gotten the=20 pulsations from the intake manifold back to the EC-2 dampened out, I'm = getting=20 about 200 RPM more running static. About 6080 rpm now.  My MP = display on=20 the EM-2 always bounced around a lot, but the engine ran = pretty well=20 lately.  I could only get 2250 or so on climb out, 65 degree = day,=20 5000 ft field elev, so I knew I was not getting full power.  I = haven't=20 flow since this change.  I figure that since the EC-2 runs almost = entirely off the Manifold pressure the pulsations where telling the = computer=20 to change to differant MAP addresses that didn't correspond to the RPM = and=20 what the engine was doing, or trying to do.  Now with everthing = much more=20 coordinated, the engine is running stronger.  I accomplished this = by=20 restricting the lines going back to the EC-2 with 1/16 inch plastic = tube=20 inside the vacuum lines and adding an accumulator (3/4 inch tubing)=20 downstream  that is packed with green nylon scrubby material to = further=20 dampen.  One more of hundreds of projects  done.  More = to=20 go.
    Now for my next = project. =20 My MP display on the EM-2 is not steady.  Right now with a closed = hanger,=20 engine off, no wind and all electrics off, except the EC-2 and the = EM-2, the=20 MP bounces around.  The average is about 24.7.  But it jumps = around=20 randomly.   24.9, then 24.6, then 24.8 then 24.9, then 24.3 = then=20 25.1 then 24.6 then as high as 25.3.   You get the = idea.  I=20 have been told that others, when in this condition, the MP is rock=20 steady.  The same for when they are running at a steady throttle=20 setting.  That's what I think I should be getting too.  I = also get=20 this same thing happening when the engine is running at all steady = throttle=20 settings.  It happens on both controllers.  In the past, I = just=20 figured that this was normal, or close enough as there were so many = other more=20 important things to work on, but with the improvement in RPM with = dampening,=20 I'm thinking it is not.  With the dampening, the display is not = bouncing=20 around as much.  I don't know what it was as I didn't keep = track.  I=20 would really like to have this airplane as right as possible and I'm = getting=20 close.  Now I am working on fiber glass to permantly inprove = cooling,=20 waiting for new injector wire clips so I can install the 86/87 550cc = injectors=20 and then of course, remapping. and a few other things.  So this = would be=20 an excellent time to also do what ever is needed to make the MP steady = and=20 make this rotary installation as perfect as = possible.
    Your thoughts as = always=20 appreciated.
 
Don Walker
N113BR, RV-8
Renesis, EM-2, EC-2
Catto 76/88
3.5 hours Phase 1 in the pattern only =
   
 
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