Return-Path: <13brv3@bellsouth.net> Received: from imf21aec.mail.bellsouth.net ([205.152.59.69] verified) by logan.com (CommuniGate Pro SMTP 4.2b5) with ESMTP id 141149 for flyrotary@lancaironline.net; Sat, 05 Jun 2004 21:52:10 -0400 Received: from rad ([65.6.194.9]) by imf21aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040606015139.PLSD1408.imf21aec.mail.bellsouth.net@rad> for ; Sat, 5 Jun 2004 21:51:39 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "Flyrotary List" Subject: magic plenum Date: Sat, 5 Jun 2004 20:49:38 -0500 Message-ID: <00c601c44b68$87174e30$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00C7_01C44B3E.9E414630" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_00C7_01C44B3E.9E414630 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Installed the new plenum, and ran the engine today. What a surprise- = 5250 rpm static! I didn't even think to try the timing advance, or maybe I = could have made 5300. Seems I gained 200 rpm by just using the plenum. I = don't really understand this, because I can't believe there's any tuning going = on. I'll certainly take the increase though :-) =20 =20 Tuning went reasonably well, but I had to reduce Mode 3 by 4 clicks to = be able to lean the idle enough. Even idling at 1500, it's pretty obvious = that I need to install those 440 injectors that Tommy sent, in place of my = 550's. I'll do that the next time I have a reason to pull the intake I guess. = In the mean time, maybe I'll send them out to be tested. I also set the staging point to 18, rather than the standard 15, which makes tuning = easier around idle. Mode 3 didn't seem to work on the B controller, but maybe = I was just confused, because eventually, I got it more or less tuned. A = runs great, B runs. well B runs :-) =20 During the runs, I noticed that a combination of prop blast, and = vibration was taking it's toll on the new plenum. The top was kinda thin, and it = was sucking in, and causing a crease to form. After the runs were over, I = put 3 layers of 6 oz glass over this, and expect it will be rock solid now. = This seems to be an indication that the inlet tubes are more restrictive than they should be. Eventually, perhaps I'll fix this, but they're about as = big as I can use with the tight turn that they have to make under the rad = duct. They'll be much better in flight, but I hate to waste free HP. =20 =20 Added 14.2 gallons of fuel (almost full). The EM-2 says it's used 21.3 since I last zeroed it. Unfortunately, I don't remember when that was. I'll be getting new software soon anyway, so it's a moot point. Fueled = up the plane, and did a preflight. Tomorrow, I'll find out what my extra = 500 rpm gives me in climb :-) =20 =20 It was a good day :-) =20 Rusty (Hoping there's no intake #4) ------=_NextPart_000_00C7_01C44B3E.9E414630 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Installed the=20 new plenum, and ran the engine today. =20 What a surprise- 5250 rpm static!  I didn't=20 even think to try the timing advance, or maybe I could have made = 5300. =20 Seems I gained 200 rpm by just using the plenum.  I = don't really=20 understand this, because I can't believe there's any tuning going = on.  I'll=20 certainly take the increase though=20 :-)   

 

Tuning went = reasonably well,=20 but I had to reduce Mode 3 by 4 clicks to be able to lean the idle enough.  Even idling at 1500, = it’s pretty obvious=20 that I need to install those 440 injectors that Tommy sent, in place of = my=20 550’s.  I’ll = do that the next time I=20 have a reason to pull the intake I guess. =20 In the mean time, maybe I’ll send them out to be = tested.   I also set the staging = point to=20 18, rather than the standard 15, which makes tuning easier around = idle.   Mode 3 didn’t seem = to work on the=20 B controller, but maybe I was just confused, because eventually, I got = it more=20 or less tuned.  A runs = great, B=20 runs… well B runs :-)

 

During the runs,=20 I noticed that a combination of prop blast, and vibration was taking = it’s toll=20 on the new plenum.  The = top was=20 kinda thin, and it was sucking in, and causing a crease to form.  After the runs were over, I = put 3 layers=20 of 6 oz glass over this, and expect it will be rock solid now.  This seems to be an indication = that the=20 inlet tubes are more restrictive than they should be.  Eventually, perhaps I’ll = fix this, but=20 they’re about as big as I can use with the tight turn that they = have to make=20 under the rad duct.  = They’ll be much=20 better in flight, but I hate to waste free HP. 

 

Added 14.2=20 gallons of fuel (almost = full).  The EM-2 says it’s used = 21.3 since I=20 last zeroed it.  = Unfortunately, I=20 don’t remember when that was.  I’ll=20 be getting new software soon anyway, so it’s a moot point.  Fueled up the plane, and did a = preflight.  Tomorrow, = I’ll find out=20 what my extra 500 rpm gives me in climb :-)   

 

It was a = good day=20 :-)

 

Rusty = (Hoping there's=20 no intake #4)

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