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Return-Path: <13brv3@bellsouth.net> Received: from imf16aec.mail.bellsouth.net ([205.152.59.64] verified) by logan.com (CommuniGate Pro SMTP 4.2.3) with ESMTP id 430709 for flyrotary@lancaironline.net; Fri, 24 Sep 2004 12:44:32 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.64; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf16aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20040924164401.EEMP1718.imf16aec.mail.bellsouth.net@rd> for ; Fri, 24 Sep 2004 12:44:01 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: EC2 problem Date: Fri, 24 Sep 2004 11:44:13 -0500 Message-ID: <012001c4a255$b9305990$04000100@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0121_01C4A22B.D05A5190" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 In-Reply-To: Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_0121_01C4A22B.D05A5190 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable They are mismatched, but just switching from 550's (mine flow-tested at = 570) to 525's should not be that drastic an effect. That should be only a = couple of ""hours" on the mixture knob.=20 =20 As I mentioned, using the same injectors you're using, I used to have to turn the mixture knob 180 degrees (6 hours) to switch from one to the = other. My MSD's tested at 500, which still doesn't make as much difference as = they had in reality. The unknown is the reaction time of the injectors. I suspect that the Mazda injectors react faster than the MSD's, which = gives them a longer time to deliver fuel for a given pulse width. I was never able to prove this to my satisfaction though. =20 =20 Also, I'd expect turning off the primary would then result in a leaner mixture=20 =20 Absolutely agree with this. =20 =20 Yes, we tested the individual injector banks a number of times and had = no problems. Although; I can't say for sure that we did it below the stage point. =20 =20 The engine is amazingly tolerant of mixture changes at higher power settings, so it would be important to know it worked on the dyno at the = same power settings you're testing now. =20 =20 You've got me thinking that I did have to take the pins out of one side = of the plugs to pull them through to the engine compartment. The plugs are marked A, B, C, and D. and the wires were marked to match. I, of = course, got them back in correctly, right? I'll have to check.=20 =20 That's the idea. The prime suspect is anything that could possibly have been changed between the dyno and the plane. The second suspect would = be something appeared to work properly on the dyno, but wasn't tested thoroughly enough to be sure. =20 =20 Another note about checking these connections. It's VERY easy to = overlook the same mistake multiple times, particularly if you're convinced it's = OK. It's just a little practical joke that our brain plays on us. Everyone = does it at some point. Ever spend 20 minutes looking for something that you eventually "find" right on the desk in front of you. No? Yeah, me = neither :-) If possible, have someone else double check these connections just = to get an unbiased view. =20 Thank you for giving this so much thought. It is appreciated.=20 =20 You're welcome. Good luck. =20 Rusty (hoping John isn't facing East and still blowing my direction)=20 =20 =20 ------=_NextPart_000_0121_01C4A22B.D05A5190 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

They are=20 mismatched, but just switching from 550’s (mine flow-tested at = 570) to 525’s=20 should not be that drastic an effect. That should be only a = couple of=20 “”hours” on the mixture knob.

&nbs= p;

As I=20 mentioned, using the same injectors you're using, I used to have to turn = the=20 mixture knob 180 degrees (6 hours) to switch from one to the = other. =20 My MSD's tested at 500, which still doesn't make as much = difference as=20 they had in reality. The unknown is the reaction time of the=20 injectors. I suspect that the Mazda injectors react faster = than the=20 MSD's, which gives them a longer time to deliver fuel for a = given=20 pulse width. I was never able to prove this to my satisfaction=20 though.

Also, = I’d expect=20 turning off the primary would then result in a leaner mixture

&nbs= p;

Absolutely agree with=20 this.

Yes, we = tested the=20 individual injector banks a number of times and had no problems. = Although;=20 I can’t say for sure that we did it below the stage = point.

The engine is = amazingly=20 tolerant of mixture changes at higher power settings, so it would be = important=20 to know it worked on the dyno at the same power settings you're = testing=20 now.

You’ve got me=20 thinking that I did have to take the pins out of one side of the plugs = to pull=20 them through to the engine compartment. The plugs are marked A, B, = C, and=20 D. and the wires were marked to match. I, of course, got them back = in=20 correctly, right? I’ll have to check.

That's the=20 idea. The prime suspect is anything that could possibly have been = changed=20 between the dyno and the plane. The second suspect would be = something=20 appeared to work properly on the dyno, but wasn't tested thoroughly = enough=20 to be sure.

Another=20 note about checking these connections. It's VERY easy to = overlook the=20 same mistake multiple times, particularly if you're convinced it's = OK. =20 It's just a little practical joke that our brain plays on us. = Everyone=20 does it at some point. Ever spend 20 minutes looking for something = that=20 you eventually "find" right on the desk in front of you. No? = Yeah,=20 me neither :-) If possible, have someone else double check = these=20 connections just to get an unbiased = view.

Thank = you for=20 giving this so much thought. It is appreciated.

You're=20 welcome. Good luck.

Rusty (hoping=20 John isn't facing East and still blowing my=20 direction)

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