Return-Path: Received: from fed1rmmtao01.cox.net ([68.230.241.38] verified) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 778116 for flyrotary@lancaironline.net; Thu, 10 Mar 2005 10:34:42 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.38; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao01.cox.net (InterMail vM.6.01.04.00 201-2131-118-20041027) with ESMTP id <20050310153346.LOWE9923.fed1rmmtao01.cox.net@BigAl> for ; Thu, 10 Mar 2005 10:33:46 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Mixture Settings Date: Thu, 10 Mar 2005 07:33:46 -0800 Message-ID: <000001c52586$8cad2510$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C52543.7E89E510" 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_01C52543.7E89E510 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable So my belief that I need to run richer for the high power settings on the rotary is incorrect? I have Tracy's EC2 so will have to set the operating mixture. That reminds me, I haven't bought the bung for the O2 sensor yet (for the EM2). =20 Bob W. Bob; =20 I adjusted the mixture mapping on the EC2 to give me about peak EGT with = the mixture knob at 12:00. I then found max static rpm (5300) at about the = 1:00 to 1:30 position. So I'm assuming turn mixture knob slightly to the = right for takeoff and climb, and then somewhere over toward 10:00 - 11:00 for = lean cruise, depending. =20 On the dyno, we found max power at lamda of about .92 and about 150F = rich of peak. =20 BTW; I found that the mixture bar on the EM2 a bit below half way up for peak EGT, and always about 1 bar short of all the way up for very rich. Running lean at power, there can be no reading at all; off the bottom. = Am I the only one seeing this? =20 And back to the original point, I'd guess there is some unburned fuel = going out the exhaust port at max power mixture. It's the characteristic of engine. I have no idea whether this would effect the exhaust temp downstream with the VAM design where the internal air tube air mixes = with the exhaust. Even running lean at high rpm there is likely some burning going out the port, but with the excess O2 all fuel will be burned = before getting very far. =20 FWIW, =20 Al ------=_NextPart_000_0001_01C52543.7E89E510 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

So my belief that I need to run richer for the high power settings = on

the rotary is incorrect? I have Tracy's EC2 so will have = to set the

operating mixture. That reminds me, I haven't bought the bung for = the

O2 sensor yet (for the EM2).

Bob W.

Bob;

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I adjusted = the mixture mapping on the EC2 to give me about peak EGT with the mixture knob at = 12:00. I then found max static rpm (5300) at about the 1:00 to 1:30 position. So I’m assuming turn mixture = knob slightly to the right for takeoff and climb, and then somewhere over = toward 10:00 – 11:00 for lean cruise, depending.

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On the dyno, = we found max power at lamda of about .92 and about 150F rich of = peak.

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BTW; I found = that the mixture bar on the EM2 a bit below half way up for peak EGT, and always = about 1 bar short of all the way up for very rich. Running lean at power, there = can be no reading at all; off the bottom. Am I the only one seeing = this?

<= /font>

And back to = the original point, I’d guess there is some unburned fuel going out = the exhaust port at max power mixture. It’s the characteristic of = engine. I have no idea whether this would effect the exhaust temp downstream = with the VAM design where the internal air tube air mixes with the exhaust. = Even running lean at high rpm there is likely some burning going out the = port, but with the excess O2 all fuel will be burned before getting very = far.

<= /font>

FWIW,

<= /font>

Al

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