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Return-Path: Received: from [24.25.9.103] (HELO ms-smtp-04-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2b3) with ESMTP id 97553 for flyrotary@lancaironline.net; Sun, 30 May 2004 22:43:43 -0400 Received: from EDWARD (clt25-78-058.carolina.rr.com [24.25.78.58]) by ms-smtp-04-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i4V2hAVw005745 for ; Sun, 30 May 2004 22:43:12 -0400 (EDT) Message-ID: <000801c446b9$07061630$2402a8c0@EDWARD> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] intake #3 +150 rpm Date: Sun, 30 May 2004 22:43:16 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0005_01C44697.7FB1C7E0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0005_01C44697.7FB1C7E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageNow that's more like it, Rusty. I do find it interesting the you = get less rpm with the sceet tubing. I gain approx 200 rpm when I use = it, but that may be because it gets its air from my chin scoop for the = oil cooler and I suspect the prop helps stuff a little more air in the = tube. But, in any case, your RV-3 should do very nicely with that = static rpm - using Tracy's prop I presume? A plenum may or may not assist with the airflow, convention wisdom is = that it does, but I think it depends on the rest of your intake, they = have to play as a team or else they can hurt performance. Be = interesting to see what difference it makes. Ed Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Sunday, May 30, 2004 10:22 PM Subject: [FlyRotary] intake #3 +150 rpm Greetings, I installed the 3rd intake today, and got it running. It looks great = to me, but you'll have to take my word for it, because I forgot my = camera. I could maintain 5000-5050 static, and saw brief flashes of = 5100, so this is a good improvement. I ended up gaining an honest 150 = rpm. I played with the timing some, and maybe gained 50 rpm. I think = the gain from timing has more to do with how well you're timed = statically to start with. =20 =20 This rpm was with the TB open, rather than ducted to the radiator = intake with 1.75" sceet tubing for each barrel. Before, when I removed = the duct from the old intake, I only gained about 50 rpm. Now, I get = 5000 without the duct, and 4600 with it. Ain't gonna be using that = duct. Overall, the intake is a keeper, and I still need to do a few = final tasks, such as adding a brace for the TB, so it isn't supported by = my poor welds of the intake pipe. I also need to make a heat shield to = go between the intake/fuel rails and the exhaust. Full tuning is of = course in order, but the biggest thing remaining is some sort of plenum = upstream of the TB. At the moment, I haven't a clue what I'll do with = this. =20 The stock Mazda 550 injectors still require about 180 degrees less = mixture knob, than the MSD 525 injectors that are being used as = secondaries. I'll end up using those 440's that Tommy sent for the = primaries, but not until I have some other reason to remove the intake. = Still, it will idle fine down to 1200 rpm, which may be just fine for a = ported engine. =20 Cheers, Rusty (No flying until I get inspired about the plenum) ------=_NextPart_000_0005_01C44697.7FB1C7E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message

Now that's more like it, Rusty. I = do find it=20 interesting the you get less rpm with the sceet tubing. I gain = approx 200=20 rpm when I use it, but that may be because it gets its air from my chin = scoop=20 for the oil cooler and I suspect the prop helps stuff a little more air = in the=20 tube. But, in any case, your RV-3 should do very = nicely with=20 that static rpm - using Tracy's prop I presume?

A plenum may or may not assist with the = airflow,=20 convention wisdom is that it does, but I think it depends on the rest of = your=20 intake, they have to play as a team or else they can hurt = performance. Be=20 interesting to see what difference it makes.

Ed

Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC

----- Original Message -----
From:=20 Russell=20 Duffy
To: Rotary motors in = aircraft

Sent: Sunday, May 30, 2004 = 10:22 PM

Subject: [FlyRotary] intake #3 = +150=20 rpm

Greetings,

I installed the 3^rd=20 intake today, and got it=20 running. It looks great to me, but you'll = have to=20 take my word for it, because I forgot my=20 camera. I could maintain 5000-5050 static, = and saw=20 brief flashes of 5100, so this is a good improvement. I ended up = gaining an honest 150 rpm. I played with the timing = some,=20 and maybe gained 50 rpm. = I=20 think the gain from timing has more to do with how well you=92re timed = statically to start with. =20

This rpm was = with the TB=20 open, rather than ducted to the radiator intake with 1.75=94 sceet = tubing for each barrel. Before, when I removed the = duct from=20 the old intake, I only gained about 50 rpm. Now, I get 5000 without the duct, = and 4600=20 with it. Ain=92t gonna = be using=20 that duct. Overall, the = intake is=20 a keeper, and I still need to do a few final tasks, such as adding a = brace for=20 the TB, so it isn=92t supported by my poor welds of the intake = pipe. I also need to make a heat = shield to=20 go between the intake/fuel rails and the exhaust. Full tuning is of course in = order, but=20 the biggest thing remaining is some sort of plenum upstream of the = TB. At the=20 moment, I haven't a clue what I'll do with this. =20

The stock = Mazda 550=20 injectors still require about 180 degrees less mixture knob, than the = MSD 525=20 injectors that are being used as secondaries. I'll end up using = those=20 440's that Tommy sent for the primaries, but not until I have some = other=20 reason to remove the intake. Still, it will idle fine down to = 1200 rpm,=20 which may be just fine for a ported engine. =

Cheers,

Rusty (No = flying=20 until I get inspired about the=20 plenum)

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