Return-Path: <13brv3@bellsouth.net> Received: from imf21aec.mail.bellsouth.net ([205.152.59.69] verified) by logan.com (CommuniGate Pro SMTP 4.2b3) with ESMTP id 3220970 for flyrotary@lancaironline.net; Fri, 07 May 2004 22:36:33 -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 <20040508023633.LFNI24544.imf21aec.mail.bellsouth.net@rad> for ; Fri, 7 May 2004 22:36:33 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "Flyrotary List" Subject: Tracy's dyno test Date: Fri, 7 May 2004 21:36:34 -0500 Message-ID: <003701c434a5$478e1ac0$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0038_01C4347B.5EB812C0" 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_0038_01C4347B.5EB812C0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Greetings, I bolted on Tracy's prop today, and ran the engine some. This was = partly to make sure I can top off the coolant tomorrow, and partly (mostly) to see what I get for static rpm. Tracy stated that he typically got between = 5100 and 5200 rpm static, and as expected, I'm below that. My best mixture = rpm was 4800, with the more typical mixture of 47XX. I could always hope = that my intake is just going to be more efficient at higher rpms, but what = are the chances :-) =20 Unfortunately, the intake continues to exhibit signs of transition = problems, so it's only a matter of time until it goes away. To get any sort of = decent throttle acceleration, the mixture has to be on the rich side, about = 3:00, otherwise you can watch the mixture fall off to nothing, and the engine sags. Deceleration needs to be just the opposite, around 9:00. I'm = now convinced of two things- I would be better off with smaller injectors = (38 lb/min on order to replace the current 50 lb/min), and I MUST get the injectors back closer to the block.=20 I have a short, straight intake, that can be modified to work, and I = could also use tubing to make my own short intake from scratch. Hard as I = try, I just can't see a way to make a "proper" EDDIE intake fit the the = confines of my RV-3 cowl. Since I will want my best tuned rpm to be around 7000, = the short version of manifold may work better than it has for others. I = just haven't made a decision on what to try next though. I'll probably feel compelled to try a short intake, and see if it's better or worse than = what I have now. At least I can collect some benchmark numbers for comparison. = =20 If anyone has any brilliant ideas, I'd like to hear them. Cheers, Rusty (flying with wood tomorrow)=20 ------=_NextPart_000_0038_01C4347B.5EB812C0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Greetings,

I bolted on Tracy’s prop = today, and ran=20 the engine some.  This was partly to make sure I can top off the = coolant=20 tomorrow, and partly (mostly) to see what I get for static rpm.  = Tracy=20 stated that he typically got between 5100 and 5200 rpm static, and as = expected,=20 I’m below that.  My best mixture rpm was 4800, with the more = typical=20 mixture of 47XX.   I could always hope that my intake is = just=20 going to be more efficient at higher rpms, but what are the chances = :-) 

Unfortunately, the intake continues to exhibit = signs of=20 transition problems, so it’s only a matter of time until it goes = away.  To=20 get any sort of decent throttle acceleration, the mixture has to be on = the rich=20 side, about 3:00, otherwise you can watch the mixture fall off to = nothing, and=20 the engine sags.   Deceleration needs to be just the opposite, = around=20 9:00.  I’m now convinced of two things- I would be better off = with smaller=20 injectors (38 lb/min on order to replace the current 50 lb/min), and I = MUST get=20 the injectors back closer to the block.

I have a short, straight intake, that can be = modified to=20 work, and I could also use tubing to make my own short intake from=20 scratch.  Hard as I try, I just can't see a way to make a "proper" = EDDIE=20 intake fit the the confines of my RV-3 cowl.  Since = I will want=20 my best tuned rpm to be around 7000, the short version of = manifold may=20 work better than it has for others.  I just haven't made a decision = on what=20 to try next though.  I'll probably feel compelled to try a short = intake,=20 and see if it's better or worse than what I have now.  At least I = can=20 collect some benchmark numbers for comparison. 

If anyone has any brilliant ideas, = I'd like to=20 hear them.

Cheers,

Rusty (flying with wood=20 tomorrow) 

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