X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from qw-out-2122.google.com ([74.125.92.27] verified) by logan.com (CommuniGate Pro SMTP 5.2.13) with ESMTP id 3598224 for flyrotary@lancaironline.net; Mon, 27 Apr 2009 12:57:28 -0400 Received-SPF: pass receiver=logan.com; client-ip=74.125.92.27; envelope-from=rwstracy@gmail.com Received: by qw-out-2122.google.com with SMTP id 8so23922qwh.25 for ; Mon, 27 Apr 2009 09:56:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:sender:received:in-reply-to :references:date:x-google-sender-auth:message-id:subject:from:to :content-type; bh=rup2rAlGfvrAXKRIbpEVKT9Evc3laIedZcRUz/lbFmk=; b=MmPSeRXM8eC+w8QuWHbDnmE/s5URXR24NUN3VNvYwAIlHPLSDit/vahTr9tTnlkP2T XrnrEFMQylPNHh+IIQtnC1ydesDCmgpZxOifUXiXlVg6MGTxWnEXUhndKFlzyGlHh8sH ki/sbE/G0Pnavl7ey4LQVL+kwvzk8I7K/XNI4= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:content-type; b=oEho32qUGTkBHm3WGTU2H0pVzYF7/gLmtpfPXS0DN4awIPq3g+KIHo3GsBBc+HDypq g08D3MbSwqpHzD4awhrbhzh+sRrItuWPZBwbkpRYpt94IOsvsfZVMhPyNQRCwpaEqf2g vlXOfDEamkn5znoz85m1/Sg5XZzT3dV+pzdCU= MIME-Version: 1.0 Sender: rwstracy@gmail.com Received: by 10.224.11.136 with SMTP id t8mr6216277qat.305.1240851412822; Mon, 27 Apr 2009 09:56:52 -0700 (PDT) In-Reply-To: References: Date: Mon, 27 Apr 2009 12:56:52 -0400 X-Google-Sender-Auth: 0b8f44e1da92a733 Message-ID: <1b4b137c0904270956i35a35e46m9df903e374ca0e57@mail.gmail.com> Subject: Re: [FlyRotary] Re: Tuning the EC-2 From: Tracy Crook To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0015175cd648ae2d2f04688c3b91 --0015175cd648ae2d2f04688c3b91 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit You guys have a good handle on this so no need to elaborate on it. Thanks for educating the other users. Tracy (back to undoing flood preparations) On Sun, Apr 19, 2009 at 7:50 AM, Mark Steitle wrote: > Good post Bill. I think that there is much confusion on how the EC-2 map > table works. It is difficult to get to some areas of the table (high rpm, > low map) when running on the ground. You must do as you did and extrapolate > those addresses from those nearby that have been tuned. Once you get them > close, you'll have to fine tune it in the air, at least that has been my > experience. Best to get it close on the ground, then let auto-tune tweak > the settings while you fly the airplane. > > Mark S. > > On Sat, Apr 18, 2009 at 10:21 PM, Bill Schertz wrote: > >> All, >> I have been working on getting my EC-2 tuned to get smooth engine >> operation over the entire range. >> >> I used Mode 1 to do the initial tuning, and got it to run reasonably well >> with some roughness at various points. >> >> I then used the auto tune feature on the ground, running the engine up to >> higher and higher RPM and letting it tune in the settings. >> >> At that point I thought I was pretty much there, with one exception. >> >> When idling (600 rpm prop, 1710 engine) and increasing the throttle slowly >> (with a vernier throttle, rotating the knob), the engine would accelerate >> pretty smoothly all the way up, however, If I Pushed the throttle in >> quickly, the engine would hesitate, buck, jump up and down in MP until >> suddenly it would scream to life at 3000 engine rpm and then be smooth. >> >> I finally figured out what the issue was. When auto tuning (or manual >> tuning) on the ground, the MAP table values at low RPM (Low manifold >> pressure) are selected from the low rpm table (values 0-63). As I slowly >> advanced the throttle, the EM-2 brought each table value into good order, >> but at ~2400 rpm it switches to the high table value and keeps going on >> adjusting the table values. >> >> When advancing the throttle rapidly, the Manifold pressure rises quickly, >> the RPM is still low, so the EC-2 selects values that were never adjusted in >> the previous process, the engine ran rich (very), bucked and snorted until >> the RPM gets to the high table, and then smoothed out. >> >> I finally figured this out by using the Track Mode on the EM-2 and >> watching the bin # as the throttle was advanced using the vernier. It would >> increase 2,3,4,5,6, 72, 73...etc. >> When the throttle was advanced quickly, the bin numbers went >> 2,3,4,5,6,14,12,15,13, 72, etc. By then turning the engine off, and >> manually adjusting the values in bins 8-14 to the same value as 73, the >> engine is much smoother during acceleration. >> >> >> Bill Schertz >> KIS Cruiser #4045 >> N343BS >> > > --0015175cd648ae2d2f04688c3b91 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable You guys have a good handle on this so no need to elaborate on it.=A0 Thank= s for educating the other users.

Tracy=A0 (back to undoing flood pre= parations)

On Sun, Apr 19, 2009 at 7:50 A= M, Mark Steitle <msteitle@gmail.com> wrote:
Good post Bill.= =A0 I think that there is much confusion on how the EC-2 map table works.= =A0 It is difficult to get to some areas of the table (high rpm, low map) w= hen running on the ground.=A0 You must do as you did and extrapolate those = addresses from those nearby that have been tuned.=A0 Once you get them clos= e, you'll have to fine tune it in the air, at least that has been my ex= perience.=A0 Best to get it close on the ground, then let auto-tune tweak t= he settings while you fly the airplane.

Mark S.=A0

On Sat, Apr 18, 2009 at 10:21 PM, Bill Schertz &= lt;wschertz@comca= st.net> wrote:
All,
I=A0have been working on getting my EC= -2 tuned=20 to get smooth engine operation over the entire range.
=A0
I used Mode 1 to do the initial tuning= , and got it=20 to run reasonably well with some roughness at various points.
=A0
I then used the auto tune feature on t= he ground,=20 running the engine up to higher and higher RPM and letting it tune in the= =20 settings.
=A0
At that point I thought I was pretty m= uch there,=20 with one exception.
=A0
When idling (600 rpm prop, 1710 engine= ) and=20 increasing the throttle slowly (with a vernier throttle, rotating the knob)= , the=20 engine would accelerate pretty smoothly all the way up, however, If I Pushe= d the=20 throttle in quickly, the engine would hesitate, buck, jump up and down in M= P=20 until suddenly it would scream to life at 3000 engine rpm and then be=20 smooth.
=A0
I finally figured out what the issue w= as. When auto=20 tuning (or manual tuning) on the ground, the MAP table values at low RPM (L= ow=20 manifold pressure) are selected from the low rpm table (values 0-63). As I= =20 slowly advanced the throttle, the EM-2 brought each table value into good o= rder,=20 but at ~2400 rpm it switches to the high table value and keeps going on=20 adjusting the table=A0 values.
=A0
When advancing the throttle rapidly, t= he Manifold=20 pressure rises quickly, the RPM is still low, so the EC-2 selects values th= at=20 were never adjusted in the previous process, the engine ran rich (very), bu= cked=20 and snorted until the RPM gets to the high table, and then smoothed=20 out.
=A0
I finally figured this out by using th= e Track Mode=20 on the EM-2 and watching the bin # as the throttle was advanced using the= =20 vernier. It would increase 2,3,4,5,6, 72, 73...etc.
When the throttle was advanced quickly= , the bin=20 numbers went 2,3,4,5,6,14,12,15,13, 72, etc.=A0 By then turning the engine= =20 off, and manually adjusting the values in bins 8-14 to the same value as 73= , the=20 engine is much smoother during acceleration.
=A0
=A0
Bill Schertz
KIS Cruiser=20 #4045
N343BS


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