Return-Path: Received: from ms-smtp-01.southeast.rr.com ([24.93.67.82] verified) by logan.com (CommuniGate Pro SMTP 4.1.3) with ESMTP id 2561263 for flyrotary@lancaironline.net; Thu, 28 Aug 2003 21:56:54 -0400 Received: from o7y6b5 (clt78-221.carolina.rr.com [24.93.78.221]) by ms-smtp-01.southeast.rr.com (8.12.5/8.12.2) with SMTP id h7T1nr4Q000274 for ; Thu, 28 Aug 2003 21:49:54 -0400 (EDT) Message-ID: <001e01c36dd0$9ca52680$1702a8c0@WorkGroup> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: MSD injector test results Date: Thu, 28 Aug 2003 21:55:24 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001B_01C36DAF.156A53A0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_001B_01C36DAF.156A53A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message Sorry, didn't make it clearer. I leave "B" in default as a = safety back up. I KNOW the engine will run in default - so that's my = standby in event I really, really screw up processor "A" while tuning in = the air, I can flip to "B" with assurance it will run. =20 Yes, if below staging and I manual switch off the primaries, the engine = hesitates for a second and I found if I enrichen the mixture immediately = before/after I turn off the primaries, the secondaries catch smoothly. = Yes, then I can turn the mixture back to what I had for the primaries. = The reason for that may be unique to my set up. On that intake, both = the EC2 pressurer sensor lines are connected to the primary runners = (don't ask why - its changed on my later intakes) , the secondaries have = 20% more air volume (larger tubes), I suspect that the processor is = setting the injection timing based on what the primary manifold pressure = is asking for. As long as I am running on the primary injectors, its = getting the fuel it needs. However, when I turn the primaries off and = the secondaries on, the processor is still thinking its providing fuel = PW for the primaries and does not increase the pulse width to = accommodate the 20% greater volume of air in the secondaries (which it = had no way of sensing). Therefore, the initial lean condition when = switching to the secondaries. At least thats my theory/story and I'm = sticking to it. Ed Hi Ed, Thanks for the test offer. I have to admit that you lost me with your = reasoning for leaving the B controller at the default. I can't leave = the B controller at the default, because it's too rich to run below = about 15" MAP. I also adjust the program value to leave the manual = mixture knob at 12:00. At this setting, when I turn off the primaries = (MSD's) around idle, I have to turn the mixture knob all the way down, = and it's still a little too rich running on the Mazda 550's. =20 Since you have matching injectors, you would expect to be able to turn = off the primaries, and have the secondaries run at the same mixture = setting. In the past, you've mentioned that you have to enrichen the = mixture before turning off the primaries, or the engine wants to lean = out and die. The question is- do you have to leave the mixture richer = than 12:00, or can you turn it back to 12:00 and still run fine on the = secondaries alone?=20 Tracy, is this a valid test? In other words, do the primaries and = secondaries get the exact same pulse width when running by themselves = below the staging point? =20 Thanks, Rusty ------=_NextPart_000_001B_01C36DAF.156A53A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
 Sorry, didn't make it = clearer.  I=20 leave "B" in default as a safety back up.  I KNOW the engine will = run in=20 default - so that's my standby in event I really, really screw up = processor "A"=20 while tuning in the air, I can flip to "B" with assurance it will = run. =20
 
Yes, if below staging and I manual = switch off the=20 primaries, the engine hesitates for a second and I found if I enrichen = the=20 mixture immediately before/after I turn off the primaries, the = secondaries catch=20 smoothly.  Yes, then I can turn the mixture back to what I had for = the=20 primaries.  The reason for that may be unique to my set up.  = On that=20 intake, both the EC2 pressurer sensor lines are connected to the primary = runners=20 (don't ask why - its changed on my later intakes) , the secondaries have = 20%=20 more air volume (larger tubes), I suspect that the processor is setting = the=20 injection timing based on what the primary manifold pressure is asking=20 for.  As long as I am running on the primary injectors, its getting = the=20 fuel it needs.  However, when I turn the primaries off and the = secondaries=20 on, the processor is still thinking its providing fuel PW for the = primaries=20 and does not increase the pulse width to accommodate the 20% greater = volume of=20 air in the secondaries (which it had no way of sensing).  = Therefore, the=20 initial lean condition when switching to the secondaries. At least = thats my=20 theory/story and I'm sticking to it.
 
Ed
 
Hi=20 Ed,
 
Thanks for=20 the test offer.  I have to admit that you lost me with your = reasoning for=20 leaving the B controller at the default.  I can't leave the B = controller=20 at the default, because it's too rich to run below about 15" = MAP.  =20 I also adjust the program value to leave the manual mixture knob at=20 12:00.  At this setting, when I turn off the primaries (MSD's) = around=20 idle, I have to turn the mixture knob all the way down, and it's still = a=20 little too rich running on the Mazda 550's. 
 
Since you=20 have matching injectors, you would expect to be able to turn off the=20 primaries, and have the secondaries run at the same mixture = setting.  In=20 the past, you've mentioned that you have to enrichen the mixture = before=20 turning off the primaries, or the engine wants to lean out and = die.  The=20 question is- do you have to leave the mixture richer than 12:00, or = can you=20 turn it back to 12:00 and still run fine on the secondaries=20 alone? 
 
Tracy, is=20 this a valid test?  In other words, do the primaries and = secondaries get=20 the exact same pulse width when running by themselves below the = staging=20 point?  
 
Thanks,
Rusty 
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