Return-Path: Received: from fed1rmmtao10.cox.net ([68.230.241.29] verified) by logan.com (CommuniGate Pro SMTP 4.2b2) with ESMTP id 3180853 for flyrotary@lancaironline.net; Tue, 20 Apr 2004 13:00:31 -0400 Received: from BigAl ([68.107.116.221]) by fed1rmmtao10.cox.net (InterMail vM.6.01.03.02 201-2131-111-104-20040324) with ESMTP id <20040420170025.DDFD15895.fed1rmmtao10.cox.net@BigAl> for ; Tue, 20 Apr 2004 13:00:25 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: intake ideas? Date: Tue, 20 Apr 2004 10:00:33 -0700 Message-ID: <002001c426f8$febd4be0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0021_01C426BE.525E73E0" 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 V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_0021_01C426BE.525E73E0 Content-Type: text/plain; charset="us-ascii" 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 manifold. 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. =20 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 = stream 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. =20 Tracy =20 I use the stock ports in the TWM throttle body. I assumed they would = know where to place the port to get a good measurement. =20 Where do you measure MAP on your system? I can't believe that you could = see that kind of pressure at the engine end of a long intake tube. But I remember once before when I was wrong:-). =20 Al =20 =20 ------=_NextPart_000_0021_01C426BE.525E73E0 Content-Type: text/html; charset="us-ascii" 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 = manifold. 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 stream 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 know where to place the port = to get a good measurement.

Where do you measure MAP on your = system? I can’t believe that you could see that kind of pressure at = the engine end of a long intake tube. But I remember once before when = I was wrongJ.

------=_NextPart_000_0021_01C426BE.525E73E0--