Return-Path: Received: from fed1rmmtao01.cox.net ([68.230.241.38] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 485582 for flyrotary@lancaironline.net; Mon, 25 Oct 2004 10:19:36 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.38; envelope-from=ALVentures@cox.net Received: from BigAl ([68.107.116.221]) by fed1rmmtao01.cox.net (InterMail vM.6.01.03.04 201-2131-111-106-20040729) with ESMTP id <20041025141902.JCCK4024.fed1rmmtao01.cox.net@BigAl> for ; Mon, 25 Oct 2004 10:19:02 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: TWM MAP measurement Date: Mon, 25 Oct 2004 07:19:19 -0700 Message-ID: <000001c4ba9d$9e225b20$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C4BA62.F1C38320" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C4BA62.F1C38320 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I still can't believe I'm really only getting 26" MAP in climb though, because I'm turning close to 6200 rpm at 120 mph. Since that's the same = as what you were seeing, I find it pretty hard to imagine that I'm getting = as much power as you had, but with 4" less MAP. I sure hope I'm wrong = though :-) =20 Rusty; =20 Maybe you're comparing apples and cherimoyas. Measuring MAP at the downstream end of the TB "runners" is different than measuring out in = the air plenum before any losses. It is difficult to believe there is 4" = drop, but until we have some other measurements, we don't know for sure. On = my dyno runs I also measured 26" at 6200 WOT. =20 On another issue, since adding damping volume with clear vinyl tubing in = the MAP sensor line, I am finding that there is some fuel accumulating at a = low point in the line. I find this very strange since the MAP ports are on = the side walls of the TB barrels, but since the ports are downstream from = the injectors, there must be some fuel migrating along the walls and getting into the ports. What is the orientation of your TB - MAP line coming = off the top of the TB or off the bottom? If coming off the bottom (as mine = is) you may want to pull off your MAP line and see if there is any fuel in there. =20 Al ------=_NextPart_000_0001_01C4BA62.F1C38320 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

  I still = can't believe I'm really only getting 26" MAP in climb though, because I'm turning close to 6200 rpm at 120 mph.  Since that's the same as what you were seeing, I find it pretty hard to = imagine that I'm getting as much power as you had, but with 4" less = MAP.  I sure hope I'm wrong though :-)

 

Rusty;

 

Maybe you’re comparing = apples and cherimoyas.  Measuring MAP at the downstream end of the TB = “runners” is different than measuring out in the air plenum before any = losses.  It is difficult to believe there is 4” drop, but until we have some = other measurements, we don’t know for sure.  On my dyno runs I also measured 26” at 6200 WOT.

 

On another issue, since adding = damping volume with clear vinyl tubing in the MAP sensor line, I am finding that = there is some fuel accumulating at a low point in the line.  I find this = very strange since the MAP ports are on the side walls of the TB barrels, but = since the ports are downstream from the injectors, there must be some fuel = migrating along the walls and getting into the ports.  What is the = orientation of your TB – MAP line coming off the top of the TB or off the bottom? = If coming off the bottom (as mine is) you may want to pull off your MAP = line and see if there is any fuel in there.

 

Al

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