Return-Path: Received: from fed1rmmtao03.cox.net ([68.230.241.36] verified) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 382218 for flyrotary@lancaironline.net; Sat, 28 Aug 2004 11:04:19 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.36; envelope-from=ALVentures@cox.net Received: from BigAl ([68.107.116.221]) by fed1rmmtao03.cox.net (InterMail vM.6.01.03.02.01 201-2131-111-104-103-20040709) with ESMTP id <20040828150347.MBF12802.fed1rmmtao03.cox.net@BigAl> for ; Sat, 28 Aug 2004 11:03:47 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Engine run-vacuum accumilator Date: Sat, 28 Aug 2004 08:03:57 -0700 Message-ID: <000001c48d10$3ea12d80$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C48CD5.92473780" 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_01C48CD5.92473780 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Al, =20 Here's a clip from I email exchange I had with Tracy a while back. For=20 me the trick to getting a smooth idle and a balanced mixture between=20 rotors at high power was to measure the MAP right behind the throttle=20 body so to minimized the effect of the pulses in the runners. =20 The MAP ports are just downstream from the TB. The difference is that Tracy's TB is way out there BEFORE the runners. Mine are about 5" from = the rotor housing, and downstream from what are effectively short runners - = the TB barrels. I guess it could be that there is very short term = variations in the MAP readings. =20 Is there a pattern here? Are all those of us seeing rough low-MAP = issues measuring MAP nearer the intake ports? Let's see; Rusty, Dave. . . who else? =20 Al ------=_NextPart_000_0001_01C48CD5.92473780 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi Al,

 

Here's a clip from I email exchange I had with Tracy a while = back. For

me the trick to getting a smooth idle and a balanced mixture between =

rotors at high power was to measure the MAP right behind the throttle =

body so to minimized the effect of the pulses in the = runners.

 

The MAP ports are just downstream from the = TB.  The difference is that Tracy’s TB is way out there BEFORE the runners.  Mine are about 5” = from the rotor housing, and downstream from what are effectively short runners = – the TB barrels.  I guess it could be that there is very short term variations in the MAP readings.

 <= /font>

Is there a = pattern here?  Are all those of us seeing rough low-MAP issues measuring = MAP nearer the intake ports?  Let’s see; Rusty, Dave. . . who = else?

 <= /font>

Al

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