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X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: <13brv3@bellsouth.net> Received: from imf16aec.mail.bellsouth.net ([205.152.59.64] verified) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 948969 for flyrotary@lancaironline.net; Wed, 18 May 2005 15:05:29 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.64; envelope-from=13brv3@bellsouth.net Received: from ibm58aec.bellsouth.net ([65.6.194.9]) by imf16aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050518190444.TZV7916.imf16aec.mail.bellsouth.net@ibm58aec.bellsouth.net> for ; Wed, 18 May 2005 15:04:44 -0400 Received: from rd ([65.6.194.9]) by ibm58aec.bellsouth.net (InterMail vG.1.02.00.01 201-2136-104-101-20040929) with ESMTP id <20050518190443.OYKN25991.ibm58aec.bellsouth.net@rd> for ; Wed, 18 May 2005 15:04:43 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "Flyrotary List" Subject: More MAP measurement questions Date: Wed, 18 May 2005 14:04:55 -0500 Message-ID: <002d01c55bdc$7a425f30$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002E_01C55BB2.916C5730" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 This is a multi-part message in MIME format. ------=_NextPart_000_002E_01C55BB2.916C5730 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Greetings, =20 I'm working on a new theory about my low MAP reading. The theory is = that this isn't a problem at all, but rather a difference in the way it's = being measured. =20 =20 The TWM TB has a MAP port about 4 inches past the entrance of the TB = throat. That means I'm measuring the air pressure on the suction side of the = largest restriction in the system (from wide open space, to 41mm tube). Since there's no significant restriction downstream from the TB, I would guess that I could measure the MAP at the inlet of the side housing, and = wouldn't find it significantly lower than what I'm seeing in the TWM TB. In = other words, I'm measuring the worst possible MAP, which is the suction side. = =20 =20 From what I understand, the typical (if there is such a thing) intake = has a large TB, feeding into an open plenum, then into the smaller runners = that go to the engine. If I'm not mistaken, virtually everyone is measuring = their MAP in the open plenum, before the air has to enter the smaller runners = to go to the engine. In other words, the people who are reading 30" are = doing it on the pressure side of the largest restriction. =20 =20 I could babble on about this, but my point is to ask where others are measuring their MAP (turbo folks need not apply). You'll also have to = give a general description of your intake layout. I already know that Ed = and Tracy are using the "typical" situation. Is anyone measuring MAP in the runner to the engine? =20 =20 Cheers, Rusty (duty calls...) =20 ------=_NextPart_000_002E_01C55BB2.916C5730 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Greetings,

I'm working on = a new theory=20 about my low MAP reading. The theory is that this isn't a problem = at all,=20 but rather a difference in the way it's being measured. =20

The TWM TB has = a MAP port=20 about 4 inches past the entrance of the TB throat. That = means I'm=20 measuring the air pressure on the suction side of the largest = restriction in the=20 system (from wide open space, to 41mm tube). Since there's = no=20 significant restriction downstream from the TB, I would guess that = I could=20 measure the MAP at the inlet of the side housing, and wouldn't find = it=20 significantly lower than what I'm seeing in the TWM TB. In = other=20 words, I'm measuring the worst possible MAP, which is the suction=20 side.

From what I = understand, the=20 typical (if there is such a thing) intake has a large TB, feeding into = an open=20 plenum, then into the smaller runners that go to the=20 engine. If I'm not mistaken, virtually everyone is = measuring=20 their MAP in the open plenum, before the air has to enter the smaller = runners=20 to go to the engine. In other words, the people who = are=20 reading 30" are doing it on the pressure side of the largest=20 restriction.

I could babble = on about=20 this, but my point is to ask where others are measuring their MAP (turbo = folks=20 need not apply). You'll also have to give a general description of = your=20 intake layout. I already know that Ed and Tracy are using = the=20 "typical" situation. Is anyone measuring MAP in the runner to the=20 engine?

Cheers,

Rusty (duty=20 calls...)

=20

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