Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Tue, 01 Mar 2005 16:21:02 -0500 Message-ID: X-Original-Return-Path: Received: from systems3.net ([68.14.236.16] verified) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP-TLS id 765159 for lml@lancaironline.net; Tue, 01 Mar 2005 14:26:30 -0500 Received-SPF: none receiver=logan.com; client-ip=68.14.236.16; envelope-from=cberland@systems3.net Received: from systems0d3b724 ([192.168.1.81]) by systems3.net (8.13.1/8.13.1/Debian-12) with SMTP id j21JPhFT025644 for ; Tue, 1 Mar 2005 12:25:43 -0700 X-Original-Message-ID: <00d201c51e93$9c45e7e0$5101a8c0@systems0d3b724> From: "Craig Berland" X-Original-To: "Lancair Mail List" Subject: [LML] Re: FADEC Rough idle explanation X-Original-Date: Tue, 1 Mar 2005 12:19:32 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00CB_01C51E58.ECDB5680" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1437 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 X-Virus-Scanned: clamd / ClamAV version 0.75-1, clamav-milter version 0.75c on linux X-Virus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_00CB_01C51E58.ECDB5680 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable "Why would you lean a TSIO-550 engine at a field with 5 or 10K density altitude? =20 The turbo at redline MP and RPM makes more HP at 5000 feet and 10,000 = feet than it does at sea level. =20 Not a good time to lean it. George" Agreed.....the power correction for each inch Hg is approx. 3.9% and the = correction=20 for each 10 deg C is approx. 2%. Remember this is manifold air temp not = outside temp. If the turbo maintains MP and the manifold temp goes down, then the = power goes up,=20 thus you need more fuel not less. An IO550 would be a different story. = At 10,000 ft it=20 would be at approx. 25% power loss. Approx. 25 gph vs 18-19 gph = required. Craig Berland ------=_NextPart_000_00CB_01C51E58.ECDB5680 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

"Why would you=20 lean a TSIO-550 engine at a field with 5 or 10K=20 density
altitude?
The turbo at redline MP and = RPM makes=20 more HP at 5000 feet and 10,000 feet
than it does at sea=20 level.
Not a good time to lean it.=20 George"

Agreed.....the=20 power correction for each inch Hg is approx. 3.9% and the correction=20

for each 10=20 deg C is approx. 2%. Remember this is manifold air temp = not=20 outside temp.

If the turbo=20 maintains MP and the manifold temp goes down, then the power goes up,=20

thus you need=20 more fuel not less. An IO550 would be a different story. At 10,000 = ft it=20

would be=20 at=20 approx. 25% power loss. Approx. 25 gph vs 18-19 gph=20 required.

Craig=20 Berland

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