X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ey-out-2122.google.com ([74.125.78.25] verified) by logan.com (CommuniGate Pro SMTP 5.2.13) with ESMTP id 3586073 for flyrotary@lancaironline.net; Sun, 19 Apr 2009 07:51:12 -0400 Received-SPF: pass receiver=logan.com; client-ip=74.125.78.25; envelope-from=msteitle@gmail.com Received: by ey-out-2122.google.com with SMTP id 9so21526eyd.25 for ; Sun, 19 Apr 2009 04:50:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:content-type; bh=NJOQ+kU3aDANy4ccyJpLNI8s+FKdDHtQVX7lIYkKuew=; b=abAZENQEuc2vzP2RXyOyvynD6YCUeocyPTPboJzEGdkuW70IJ5Ee7PPGImQJdPvUex +Mo/2sPJ+rVpjpjHw85wX8Sta9ifzXTRdNSfOhWnYQvj0iqLudpNjDUXMugS+pht21Vl Zo4jp61MxD+FRZLiJwHCeqNNFOiJA43I22FAU= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=aUKNV5i2Uni3InNudQ0ESUnjtvTFOuAcoIxA/J/nBBUZNBpQBaEuaVUW0eQTsq14Wb S38QtzrGRkXXO0AUoV0v+NCISzOxR3geYwIgwbm4vfKIYZitotH9UsDtAzDOMNkjzgVR 77WQJuaKh4q6FOFIMBuCFG4wWphBjO1vSeUNs= MIME-Version: 1.0 Received: by 10.210.11.13 with SMTP id 13mr2588015ebk.36.1240141835184; Sun, 19 Apr 2009 04:50:35 -0700 (PDT) In-Reply-To: References: Date: Sun, 19 Apr 2009 06:50:35 -0500 Message-ID: <5cf132c0904190450h485f8dccg3111e11ab309a2f2@mail.gmail.com> Subject: Re: [FlyRotary] Tuning the EC-2 From: Mark Steitle To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0015174bde448ea9fe0467e7059f --0015174bde448ea9fe0467e7059f Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit 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 > --0015174bde448ea9fe0467e7059f Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable 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 rp= m, low map) when running on the ground.=A0 You must do as you did and extra= polate those addresses from those nearby that have been tuned.=A0 Once you = get them close, you'll have to fine tune it in the air, at least that h= as been my experience.=A0 Best to get it close on the ground, then let auto= -tune tweak the settings while you fly the airplane.

Mark S.=A0

On Sat, Apr 18, 2009 at 1= 0:21 PM, Bill Schertz <wschertz@comcast.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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