Return-Path: Received: from [65.54.169.165] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.2b2) with ESMTP id 3181725 for flyrotary@lancaironline.net; Tue, 20 Apr 2004 21:35:38 -0400 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Tue, 20 Apr 2004 18:35:37 -0700 Received: from 4.174.2.28 by bay3-dav135.adinternal.hotmail.com with DAV; Wed, 21 Apr 2004 01:35:35 +0000 X-Originating-IP: [4.174.2.28] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: intake ideas? Date: Tue, 20 Apr 2004 21:35:34 -0400 MIME-Version: 1.0 X-Mailer: MSN Explorer 7.02.0011.2700 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0001_01C4271F.69B84550" Message-ID: X-OriginalArrivalTime: 21 Apr 2004 01:35:37.0976 (UTC) FILETIME=[F2E5E780:01C42740] ------=_NextPart_001_0001_01C4271F.69B84550 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable One more comment on intake manifolds & race results. Do not ignore the = benefits of a really clean air inlet with ram air recovery BEFORE the man= ifold. At 1125 ft msl, 220 IAS, I saw manifold pressures around 31.8" = Hg. Ignore this factor and you throw away about 6% "free" horsepower. Al, I forgot to comment on your last note about your MAP tap in manifold= I think it is highly possible you were seeing errors induced by air st= ream eddies or some other unpredictable factors caused by that location. = It is a challenge to get MAP measurements when you have no real plenum,= only runners with high velocity air. Tracy I use the stock ports in the TWM throttle body. I assumed they would kno= w where to place the port to get a good measurement. Where do you measure MAP on your system? I can=E2=80=99t believe that yo= u could see that kind of pressure at the engine end of a long intake tube= But I remember once before when I was wrongJ. Al I measure it at the dynamic/plenum chamber, just under the throttle body. Tracy ------=_NextPart_001_0001_01C4271F.69B84550 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable
 
 
<= P class=3DMsoNormal style=3D"MARGIN-LEFT: 0.5in">One more comm= ent on intake manifolds & race results.   Do not ignore the= benefits of a really clean air inlet with ram air recovery BEFORE the ma= nifold.   At 1125 ft  msl, 220 IAS, I saw manifold pr= essures around 31.8" Hg.  Ignore this factor and you throw away abou= t 6% "free" horsepower.

 

Al= ,  I forgot to comment on your last note about your MAP tap in manif= old.  I think it is highly possible you were seeing errors induced b= y air stream eddies or some other unpredictable factors caused by that lo= cation.   It is a challenge to get MAP measurements when y= ou have no real plenum, only runners with high velocity air.

Tracy

 

I use the stock ports in the TWM= throttle body.  I assumed they would know where to place the port t= o get a good measurement.

Where do you measure MAP on your system? &nb= sp;I can=E2=80=99t believe that you could see that kind of pressure at th= e engine end of a long intake tube.  But I remember once before when= I was wrongJ.

Al

<= P class=3DMsoNormal>I measure it at the dynamic/plenum chamber, just under the throttl= e body.

Tracy

 

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