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Return-Path: <13brv3@bellsouth.net> Received: from imf23aec.mail.bellsouth.net ([205.152.59.71] verified) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 820001 for flyrotary@lancaironline.net; Fri, 25 Mar 2005 08:22:16 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.71; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf23aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050325132130.GNAF2468.imf23aec.mail.bellsouth.net@rd> for ; Fri, 25 Mar 2005 08:21:30 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] going lean? Date: Fri, 25 Mar 2005 07:21:49 -0600 Message-ID: <001401c5313d$99fdf290$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0015_01C5310B.4F638290" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0015_01C5310B.4F638290 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable She suggested that I might be going lean at high power because I'm = running 4 * 550 injectors instead of the stock 2 * 550 and 2 * 850. I hit a "brick wall" in the power curve at a certain rpm beyond which I get a "stutter" feeling which listeners on the ground report as a "popping" sound. I've = been thinking this is the edge of detonation and avoiding it. Maybe it is, = but perhaps it's because the injectors have topped out rather than because = of excess boost. =20 Hi John, =20 If the calculators are correct, four 550's should get you into the high 200's for HP at least. Of course you have to do your part by making = sure the mixture is correct. =20 =20 From the sound of the symptoms, it could be rich, just as much as lean. Wouldn't the simple answer be to look at your O2 readout? If you don't = have an O2 sensor, then there's no point in wasting one of those auto tune = chips on you :-) =20 Cheers, Rusty (still don't believe four 38 lb/hr injectors will get me to top = end) =20 =20 ------=_NextPart_000_0015_01C5310B.4F638290 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message

She suggested that I might be going lean at = high power=20 because I'm running 4 * 550 injectors instead of the stock 2 * 550 and 2 = * 850.=20 I hit a "brick wall" in the power curve at a certain rpm beyond which I = get a=20 "stutter" feeling which listeners on the ground report as a "popping" = sound.=20 I've been thinking this is the edge of detonation and avoiding it. Maybe = it is,=20 but perhaps it's because the injectors have topped out rather than = because of=20 excess boost.

Hi=20 John,

If the = calculators are=20 correct, four 550's should get you into the high 200's for HP at = least. Of=20 course you have to do your part by making sure the mixture is = correct. =20

From the = sound of the=20 symptoms, it could be rich, just as much as lean. Wouldn't the = simple=20 answer be to look at your O2 readout? If you don't have an O2 = sensor, then=20 there's no point in wasting one of those auto tune chips on you=20 :-)

Cheers,

Rusty (still = don't=20 believe four 38 lb/hr injectors will get me to top=20 end)

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