Return-Path: <13brv3@bellsouth.net> Received: from imf23aec.mail.bellsouth.net ([205.152.59.71] verified) by logan.com (CommuniGate Pro SMTP 4.2.4) with ESMTP id 452076 for flyrotary@lancaironline.net; Mon, 04 Oct 2004 12:04:07 -0400 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 <20041004160329.FWWG1787.imf23aec.mail.bellsouth.net@rd> for ; Mon, 4 Oct 2004 12:03:29 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: MAP pulses (20B) Date: Mon, 4 Oct 2004 11:03:53 -0500 Message-ID: <009001c4aa2b$bf342dc0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0091_01C4AA01.D65E25C0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0091_01C4AA01.D65E25C0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable With the staging point set above 15"; and having both sets of injectors operating at manifold pressures of 10-12", it seems quite clear that the "staging" is not working. The $64 question is "Why not?" =20 =20 Unless you have a scope on a pressure transducer, you can't be sure the = MAP doesn't ever pulse above 15". I'm assuming the EM-2 shows us about 1 = out of 100 pulses that the EC-2 measures, and your analog gauge ain't fast enough to see everything. Setting the transition to some really high = point might be a waste of time, and you probably need that 30 seconds for something more important :-) =20 =20 I understand what you are saying, but it would suggest that the engines would also not idle in a car; and that Dave Leanard's engine couldn't = idle smoothly at 900, as he says it does.=20 =20 I don't buy the need for small injectors either, but my point was that = if an injector was sticking a little, it would be worse at idle. Of course it would be bad in the car too, maybe worse. If you think about it, we probably need a lot more fuel to idle with the prop load than a car does with the clutch in. =20 =20 The relay that is utilized by the EC2 to disable the secondary injectors = at MAP below the stage point.=20 Do you have a relay external to the EC-2? A 13B doesn't have anything = like that, but I can imagine that running 3 injectors might exceed the = current rating of the internal EC-2 circuit that was designed to run only 2 injectors. With your firewall plugs, can you swap primary and secondary injector = wires. If you can come up with a way to do that, it might help determine if you have a leaking/sticking injector, vs some sort of electronic gremlin. I ended up cutting all my injector wires early in my original = installation, because I needed to be able to do this sort of test. Now (finally) I = have matching injectors, and equal length wires to each, so testing is much easier. =20 Good luck. If you're looking for trees to cut up, come on over :-) Rusty (X prize claimed- Go Rutan!) =20 =20 ------=_NextPart_000_0091_01C4AA01.D65E25C0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
With the = staging=20 point set above 15”; and having both sets of injectors operating = at manifold=20 pressures of 10-12”, it seems quite clear that the = “staging” is not working. The=20 $64 question is “Why not?”   
 
Unless you have a=20 scope on a pressure transducer, you can't be sure the MAP doesn't ever = pulse=20 above 15".   I'm assuming the EM-2 shows us about 1 out = of 100=20 pulses that the EC-2 measures, and your analog gauge ain't fast enough = to see=20 everything.  Setting the transition to some really high = point might be=20 a waste of time, and you probably need that 30 seconds for something = more=20 important :-)  
 

I = understand what=20 you are saying, but it would suggest that the engines would also not = idle in a=20 car; and that Dave Leanard’s engine couldn’t idle smoothly = at 900, as he says it=20 does. 

 

I = don't buy the=20 need for small injectors either, but my point was that if an = injector was=20 sticking a little, it would be worse at idle.  Of course it would = be bad in=20 the car too, maybe worse.  If you think about it, we probably need = a lot=20 more fuel to idle with the prop load than a car does with the = clutch=20 in.   

 

The relay = that is=20 utilized by the EC2 to disable the secondary injectors at MAP below the = stage=20 point. 

Do you=20 have a relay external to the EC-2?  A 13B doesn't have = anything like=20 that, but I can imagine that running 3 injectors might exceed the = current rating=20 of the internal EC-2 circuit that was designed to run only 2=20 injectors.

With your=20 firewall plugs, can you swap primary and secondary injector = wires.  If=20 you can come up with a way to do that, it might help determine if you = have=20 a leaking/sticking injector, vs some sort of electronic = gremlin.  I=20 ended up cutting all my injector wires early in my original = installation,=20 because I needed to be able to do this sort of test.  Now = (finally) I=20 have matching injectors, and equal length wires to each, so testing is = much=20 easier.    

Good=20 luck.  If you're looking for trees to cut up, come on over=20 :-)

Rusty (X=20 prize=20 claimed- Go Rutan!)   

 

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