X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from EXHUB003-3.exch003intermedia.net ([207.5.74.110] verified) by logan.com (CommuniGate Pro SMTP 5.3c3) with ESMTPS id 4000850 for flyrotary@lancaironline.net; Thu, 03 Dec 2009 12:47:43 -0500 Received-SPF: none receiver=logan.com; client-ip=207.5.74.110; envelope-from=jwhaley@datacast.com Received: from EXVMBX003-5.exch003intermedia.net ([207.5.74.45]) by EXHUB003-3.exch003intermedia.net ([207.5.74.110]) with mapi; Thu, 3 Dec 2009 09:47:05 -0800 From: Jeff Whaley To: 'Rotary motors in aircraft' Date: Thu, 3 Dec 2009 09:49:35 -0800 Subject: MAP sensor restrictions - Al G. Thread-Topic: MAP sensor restrictions - Al G. Thread-Index: Acp0QPo1wFkecEd9SDmIfuvC8T7L3A== Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-cr-hashedpuzzle: Bng= AWyi A85g A9i9 BRxg CEad CXYQ C0nb DJLr DbK9 ELVb FT9b GEss Jj8w J0p1 Lmcr;1;ZgBsAHkAcgBvAHQAYQByAHkAQABsAGEAbgBjAGEAaQByAG8AbgBsAGkAbgBlAC4AbgBlAHQA;Sosha1_v1;7;{8BC3EEA1-70FF-4F6A-B985-71B78332BB37};agB3AGgAYQBsAGUAeQBAAGQAYQB0AGEAYwBhAHMAdAAuAGMAbwBtAA==;Thu, 03 Dec 2009 17:49:35 GMT;TQBBAFAAIABzAGUAbgBzAG8AcgAgAHIAZQBzAHQAcgBpAGMAdABpAG8AbgBzACAALQAgAEEAbAAgAEcALgA= x-cr-puzzleid: {8BC3EEA1-70FF-4F6A-B985-71B78332BB37} acceptlanguage: en-US Content-Type: multipart/related; boundary="_005_C03ABB0A7362B84BB53D544B3C305E0E0153A4778A6EEXVMBX0035e_"; type="multipart/alternative" MIME-Version: 1.0 --_005_C03ABB0A7362B84BB53D544B3C305E0E0153A4778A6EEXVMBX0035e_ Content-Type: multipart/alternative; boundary="_000_C03ABB0A7362B84BB53D544B3C305E0E0153A4778A6EEXVMBX0035e_" --_000_C03ABB0A7362B84BB53D544B3C305E0E0153A4778A6EEXVMBX0035e_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Below is an old post from Al G about restricting the MAP pickups. Al, and others who may done this: Did you put the vacuum restriction closes= t to intake and then in series the accumulator closest to EC2/3? Did this require any more fine tuning of your MAP table? Or has MAP restriction/dampening become unnecessary due to latest EC2 SW wi= th low-RPM/high-MAP split in the EC2 table? Any comments? Jeff From: "Al Gietzen" Subject: Manifold vacuum gage Date: Mon, 22 Sep 2008 08:56:41 -0800 To: "Rotary motors in aircraft" [cid:image001.gif@01CA7415.A5A6AEA0] [cid:image002.gif@01CA7415.A5A6AEA0] John; That's essentially what I did, except I used epoxy instead of solder, and = used a .050 wire to form the orifice. Then used a fuel filter as an accumul= ator. It improved the idle of the engine. I had also found that using the un-damped MAP signal for the pressure-refe= renced fuel pressure regulator caused rapid pulsations in the fuel pressure= . I don't know that this affected engine operation in any way, but decided= it could an unknown stressing factor on the fuel system. Using the damped= MAP signal eliminated that phenomenon. All of this is influenced by the location of the MAP measuring ports. Min= e is picked up relatively close to the ports (about 6") and would likely ha= ve stronger pulse than if picked up in an air box at the far end of long ru= nners. Al G. --_000_C03ABB0A7362B84BB53D544B3C305E0E0153A4778A6EEXVMBX0035e_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Below is an old post from Al G about restricting the= MAP pickups.

Al, and others who may done this: Did you put the va= cuum restriction closest to intake and then in series the accumulator closest to EC2/3?

Did this require any more fine tuning of your MAP ta= ble?

Or has MAP restriction/dampening become unnecessary = due to latest EC2 SW with low-RPM/high-MAP split in the EC2 table?

Any comments?

Jeff

From:	"Al Gietzen" <ALVentures@cox.net>
Subject:	Manifold vacuum gage
Date:	Mon, 22 Sep 2008 08:56:41 -0800
To:	"Rotary motors in aircraft" <flyrotary@lancaironline.net>

John;

That&= #8217;s essentially what I did, except I used epoxy instead of solder, and used a .050 wire to form the orifice. Then used a fuel filter as an accumulator. It improved the idle of the engine.

I had= also found that using the un-damped MAP signal for the pressure-referenced fue= l pressure regulator caused rapid pulsations in the fuel pressure. I don’t know that this affected engine operation in any way, but deci= ded it could an unknown stressing factor on the fuel system. Using the damped MAP signal eliminated that phenomenon.

All o= f this is influenced by the location of the MAP measuring ports. Mine is picked up relatively close to the ports (about 6”) and would likely have stronger pulse than if picked up in an air box at the far end of lon= g runners.

Al G.=

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