X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-qy0-f179.google.com ([209.85.221.179] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with ESMTP id 4190052 for flyrotary@lancaironline.net; Tue, 30 Mar 2010 22:14:21 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.221.179; envelope-from=rwstracy@gmail.com Received: by qyk9 with SMTP id 9so3389501qyk.1 for ; Tue, 30 Mar 2010 19:13:44 -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:received:message-id:subject :from:to:content-type; bh=UIMieh5wKqgAxLPP25yjrUtdQgLUNIDvcEPUNpT7sPs=; b=nmQqwZzKQj9LFZw8XccNkPLjKJbfivmdNCckV56t9PL5Y28LLY5r/2FAf/GM1bzbKw VqUK3NK97yBceIpgp3rvmS3SCbiQi+BsshrqTuo75Z5LkILPGZe8QO+KyZfnmYsZaS6H U6c9JbunEc5i4xdJC9lymkJWA7XOmlMfNP2K8= 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=qmryKkLwsQCr609bJrKeH1+mix0JOVJcW1toslGI0cVDrwxPhjRcwzavqD+mTq3P9G VUdvV4a2puMJ+6N5nWM1QVxTI+DXdqGB9t4cJlujRMYd8yvK5sVdCqdWlRRy3DWYpqUB /uGT+rIYerNImvQyFCS++BmNk7Tmfu7AKcxgo= MIME-Version: 1.0 Sender: rwstracy@gmail.com Received: by 10.224.74.77 with HTTP; Tue, 30 Mar 2010 19:13:44 -0700 (PDT) In-Reply-To: References: Date: Tue, 30 Mar 2010 22:13:44 -0400 X-Google-Sender-Auth: 52362cb31ded7f7c Received: by 10.224.65.133 with SMTP id j5mr1934892qai.344.1270001624687; Tue, 30 Mar 2010 19:13:44 -0700 (PDT) Message-ID: <1b4b137c1003301913l2e25727cn20172ab6c44ead23@mail.gmail.com> Subject: Re: [FlyRotary] Re: FLIGHT DATA 1 From: Tracy Crook To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=000feaf220deb4253e04830f4bcc --000feaf220deb4253e04830f4bcc Content-Type: text/plain; charset=ISO-8859-1 Those are not good places to get the manifold pressure from for the very reasons you are saying. The best place is in the plenum chamber just after the throttle body. I have never experienced the bouncing MP that others have experienced when using that location. I have a fairly long silicone hose to the EC2/3 which may also help but there is nothing wrong with the small orifice & accumulator that some are using. Tracy On Tue, Mar 30, 2010 at 7:56 PM, Bill Bradburry wrote: > I bought a couple of fuel filters today. Before I install them I have a > couple of questions. > I have two taps into the intake manifold about an inch apart. Each of > these > taps connect to completely separate lines(one of them has a "T" in it which > goes to the fuel pressure regulator) which go to the two separate inlets on > the EC-2. These two lines are probably of different lengths, and the one > has > a "T" in it. So any pulses could get to the EC-2 at different times even > though they originate from the same place. > Question: should I "Y" these two lines together into the same filter and > then back out and separate them to go to the EC-2 so the pulses are more > "homogenized" between the two inlets to the EC-2, or keep them separate as > before? > Is this going to slow down the response to a throttle change and cause the > engine to "bog" when the throttle is first opened? It occurs to me the > factory probably solves this problem with the throttle position sensor > which > we don't have. > > I am interested in Tracy's take on this since he knows how his system > operates. I am assuming that we need to do this in the first place because > his system calculates so fast that the pulses cause a problem??? > > Bill B > > -----Original Message----- > From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On > Behalf Of Steven W. Boese > Sent: Tuesday, March 30, 2010 10:07 AM > To: Rotary motors in aircraft > Subject: [FlyRotary] Re: FLIGHT DATA 1 > > I used small fuel filters in the MAP sensing line. I soldered the end > closest to the intake manifold shut and then drilled a small hole through > the solder. This hole was small enough to cause instability (surging) of > the engine at idle. The hole through the solder was successively drilled > larger until the surging stopped. The resulting damping system has been in > use on my plane for several years now. I haven't tried removing it to see > if the upgraded EC2's don't need this. It's been long enough that I can't > remember what size of hole I ended up with, although that would be easy > enough to measure next time the cowl is off. > > Steve Boese > > > ________________________________________ > From: Rotary motors in aircraft [flyrotary@lancaironline.net] On Behalf Of > Bill Bradburry [bbradburry@bellsouth.net] > Sent: Monday, March 29, 2010 9:37 PM > To: Rotary motors in aircraft > Subject: [FlyRotary] Re: FLIGHT DATA 1 > > I have heard of others using some kind of expansion chamber like this, but > Don is the first I have heard of including a restriction in the line as > well. He got an improvement with the restriction before he added the > expansion chamber. I wonder if both would be needed to dampen out the > pulses? > > Bill B > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > --000feaf220deb4253e04830f4bcc Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Those are not good places to get the manifold pressure from for the very re= asons you are saying.=A0 The best place is in the plenum chamber just after= the throttle body.=A0 I have never experienced the bouncing MP that others= have experienced when using that location.=A0 I have a fairly long silicon= e hose to the EC2/3 which may also help but there is nothing wrong with the= small orifice & accumulator that some are using.

Tracy

On Tue, Mar 30, 2010 at 7:56 PM= , Bill Bradburry <bbradburry@bellsouth.net> wrote:
I bought a couple of fuel filters today. =A0Before I install them I have a<= br> couple of questions.
I have two taps into the intake manifold about an inch apart. =A0Each of th= ese
taps connect to completely separate lines(one of them has a "T" i= n it which
goes to the fuel pressure regulator) which go to the two separate inlets on=
the EC-2. These two lines are probably of different lengths, and the one ha= s
a "T" in it. =A0So any pulses could get to the EC-2 at different = times even
though they originate from the same place.
Question: =A0should I "Y" these two lines together into the same = filter and
then back out and separate them to go to the EC-2 so the pulses are more "homogenized" between the two inlets to the EC-2, or keep them se= parate as
before?
Is this going to slow down the response to a throttle change and cause the<= br> engine to "bog" when the throttle is first opened? =A0It occurs t= o me the
factory probably solves this problem with the throttle position sensor whic= h
we don't have.

I am interested in Tracy's take on this since he knows how his system operates. =A0I am assuming that we need to do this in the first place becau= se
his system calculates so fast that the pulses cause a problem???

Bill B

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Steven W. Boese
Sent: Tuesday, March 30, 2010 10:07 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: FLIGHT DATA 1

I used small fuel filters in the MAP sensing line. =A0I soldered the end closest to the intake manifold shut and then drilled a small hole through the solder. =A0This hole was small enough to cause instability (surging) of=
the engine at idle. =A0The hole through the solder was successively drilled=
larger until the surging stopped. =A0The resulting damping system has been = in
use on my plane for several years now. =A0I haven't tried removing it t= o see
if the upgraded EC2's don't need this. =A0It's been long enough= that I can't
remember what size of hole I ended up with, although that would be easy
enough to measure next time the cowl is off.

Steve Boese


________________________________________
From: Rotary motors in aircraft [flyrotary@lancaironline.net] On Behalf Of
Bill Bradburry [bbradburry@bell= south.net]
Sent: Monday, March 29, 2010 9:37 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: FLIGHT DATA 1

I have heard of others using some kind of expansion chamber like this, but<= br> Don is the first I have heard of including a restriction in the line as
well. =A0He got an improvement with the restriction before he added the
expansion chamber. =A0I wonder if both would be needed to dampen out the pulses?

Bill B

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