Return-Path: Received: from fed1mtao07.cox.net ([68.6.19.124] verified) by logan.com (CommuniGate Pro SMTP 4.1.1) with ESMTP id 2531766 for flyrotary@lancaironline.net; Mon, 18 Aug 2003 01:58:47 -0400 Received: from BigAl ([68.107.116.221]) by fed1mtao07.cox.net (InterMail vM.5.01.04.05 201-253-122-122-105-20011231) with ESMTP id <20030818055825.MIBB20997.fed1mtao07.cox.net@BigAl> for ; Mon, 18 Aug 2003 01:58:25 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] today's engine results- still no joy Date: Sun, 17 Aug 2003 22:58:38 -0700 Message-ID: <000001c3654d$c535cb30$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C36513.18D6F330" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4024 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C36513.18D6F330 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Greetings, The following is my log from today. Suffice it to say that I'm pretty disgusted. Based on the number on my secondary injectors, it does appear that they should be 50 lb/hr (525 cc/min) injectors. That should be pretty close to the stock 550's I would think, but they sure don't act like it. FWIW, they are MSD-2013 injectors, which are actually made by Rochester as a #17104487. Rusty (Maybe beer will help ) Rusty; I am using 3 MSD 2013's (525 cc/min) as secondaries, and 3 of the stock 20B sidefeed injectors in the primaries. The primaries are the purple ones that I thought were 550 cc/min, but RC engineering flow tests showed them to be 570 cc/min at 43 psig. I did not have too much trouble getting the engine to run right over the entire MAP range with the EC-2. Started right up on the default settings. Spent some time doing fine adjustment across the staging point. Overall, I had to make large lean correction at low MAP (below stage point); things were about right at intermediate MAP, and made rich correction at high MAP. I learned later the default mapping assumes MAP referenced fuel pressure, and I had a constant pressure regulator set at 40 psi; so this pattern makes sense. I had a problem with the engine dying after pulling the throttle back when it went to a MAP pressure below where I was able to run and make the big correction. This is influenced by the large primaries, but I believe will be solved by going to a MAP referenced regulator. This won't help you solve the problem, but I think shows that the mismatch of the injectors is not an issue beyond the need for some careful adjustment at the staging point. Al ------=_NextPart_000_0001_01C36513.18D6F330 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Greetings,

 

The = following is my log from today.  Suffice it to say that I'm pretty = disgusted.  Based on the number on my secondary injectors, it does appear that they = should be 50 lb/hr (525 cc/min) injectors.  That should be pretty close to = the stock 550's I would think, but they sure don't act like it.  FWIW, = they are MSD-2013 injectors, which are actually made by = Rochester as a #17104487. 

 

Rusty = (Maybe beer will help <g>)

 

 Rusty;

 

I am using 3 MSD 2013’s = (525 cc/min) as secondaries, and 3 of the stock 20B sidefeed injectors in the primaries.  The primaries are the purple ones that I thought were = 550 cc/min, but RC engineering flow tests showed them to be 570 cc/min at 43 = psig.

 

I did not have too much trouble = getting the engine to run right over the entire MAP range with the EC-2.  = Started right up on the default settings.  Spent some time doing fine = adjustment across the staging point.

 

Overall, I had to make large lean correction at low MAP (below stage point); things were about right at intermediate MAP, and made rich correction at high MAP.  I learned = later the default mapping assumes MAP referenced fuel pressure, and I had a = constant pressure regulator set at 40 psi; so this pattern makes = sense.

 

I had a problem with the engine = dying after pulling the throttle back when it went to a MAP pressure below = where I was able to run and make the big correction.  This is influenced by = the large primaries, but I believe will be solved by going to a MAP = referenced regulator.

 

This won’t help you solve = the problem, but I think shows that the mismatch of the injectors is not an = issue beyond the need for some careful adjustment at the staging = point.

 

Al

 

 

 

 

 

 

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