X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 10 [X] Return-Path: Received: from bay0-omc3-s18.bay0.hotmail.com ([65.54.246.218] verified) by logan.com (CommuniGate Pro SMTP 5.1.4) with ESMTP id 1761203 for flyrotary@lancaironline.net; Mon, 15 Jan 2007 16:33:10 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.246.218; envelope-from=lors01@msn.com Received: from hotmail.com ([65.54.250.89]) by bay0-omc3-s18.bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.2668); Mon, 15 Jan 2007 13:32:22 -0800 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Mon, 15 Jan 2007 13:32:22 -0800 Message-ID: Received: from 4.171.129.157 by BAY115-DAV17.phx.gbl with DAV; Mon, 15 Jan 2007 21:32:21 +0000 X-Originating-IP: [4.171.129.157] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: engine surging at low manifold pressure Date: Mon, 15 Jan 2007 16:32:16 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0067_01C738C2.B8474D80" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.50.0034.2000 Seal-Send-Time: Mon, 15 Jan 2007 16:32:16 -0500 X-OriginalArrivalTime: 15 Jan 2007 21:32:22.0641 (UTC) FILETIME=[A47C8610:01C738EC] Return-Path: lors01@msn.com This is a multi-part message in MIME format. ------=_NextPart_000_0067_01C738C2.B8474D80 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable It is normal for tuning to be different on the ground than when = in-flight at low MAP. There are separate low & high rpm MAP tuning = tables in the EC2. The engine can turn much higher rpm at the same MP = while in-flight. Because of this, some fine tuning MUST be done while = in-flight unless you happen to have a dynamometer laying around the = house : -) . Tracy ----- Original Message -----=20 From: Bob White=20 To: Rotary motors in aircraft=20 Sent: Sunday, January 14, 2007 3:30 PM Subject: [FlyRotary] Re: engine surging at low manifold pressure Hi Lou & Paul, I see surging at low rpm if the mixture gets too lean amd rough = running or missing if it's too rich on my 13B. Above 3000 rpm or so it runs real smooth at almost any mixture setting. Do you have an O2 sensor to check the mixture? I tuned the EC2 on the ground but it seems like the tuning is different when I'm flying. It seemed to be running = richer in flight. Bob W. =20 On Sun, 14 Jan 2007 11:10:37 -0800 (PST) lou rubin > wrote: > We have recently tuned the Ec2 on a 20B & although it > has helped it run a little smoother we still get alot > of roughness & surging at idle from 15 to 18 inches > Mp& especially when pulling back power Has anyone > experienced this problem? The plane has been run on > the ground, however the problem was just as bad in air > in a descent.=20 >=20 > Lou & Paul N ES 117ES >=20 >=20 >=20 > =20 --=20 N93BD - Rotary Powered BD-4 - = http://www.bob-white.com First Flight: 11/23/2006 7:50AM - 1.7 Hours Total Time Cables for your rotary installation - = http://www.roblinphoto.com/shop/ -- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net/lists/flyrotary/ ------=_NextPart_000_0067_01C738C2.B8474D80 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

It is normal for tuning to be different on the ground than when = in-flight=20 at low MAP. There are separate low & high rpm MAP tuning = tables in the=20 EC2. The engine can turn much higher rpm at the same MP while=20 in-flight. Because of this, some fine tuning MUST be done = while=20 in-flight unless you happen to have a dynamometer laying around the = house :=20 -) .

Tracy

----- Original Message -----

From: Bob White

To: Rotary motors in = aircraft

Sent: Sunday, January 14, 2007 = 3:30=20 PM

Subject: [FlyRotary] Re: engine = surging=20 at low manifold pressure

Hi Lou & Paul,

I see surging at low rpm if = the=20 mixture gets too lean amd rough running
or missing if it's too rich = on my=20 13B. Above 3000 rpm or so it runs
real smooth at almost any = mixture=20 setting. Do you have an O2 sensor
to check the mixture? = I tuned=20 the EC2 on the ground but it seems like
the tuning is different = when I'm=20 flying. It seemed to be running richer
in flight.

Bob = W. =20

On Sun, 14 Jan 2007 11:10:37 -0800 (PST)
lou rubin = <grdflyguy@yahoo.com>=20 wrote:

> We have recently tuned the Ec2 on a 20B & = although=20 it
> has helped it run a little smoother we still get = alot
> of=20 roughness & surging at idle from 15 to 18 inches
> Mp&=20 especially when pulling back power Has anyone
> experienced this = problem? The plane has been run on
> the ground, however the = problem was=20 just as bad in air
> in a descent.
>
> Lou &=20 Paul N ES 117ES
>
>
>
>
--=20
N93BD - Rotary Powered BD-4 - http://www.bob-white.com
First=20 Flight: 11/23/2006 7:50AM - 1.7 Hours Total Time
Cables for = your=20 rotary installation - http://www.roblinphoto.com/shop= /

--
Homepage: =20 http://www.flyrotary.com/
Archi= ve and=20 UnSub: http://mail.lanca= ironline.net/lists/flyrotary/

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