Return-Path: <13brv3@bellsouth.net> Received: from imf21aec.mail.bellsouth.net ([205.152.59.69] verified) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 608667 for flyrotary@lancaironline.net; Sat, 15 Jan 2005 20:51:50 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.69; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf21aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050116015115.IZNZ2064.imf21aec.mail.bellsouth.net@rd> for ; Sat, 15 Jan 2005 20:51:15 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: stock 4-port exhaust port measurement? Date: Sat, 15 Jan 2005 19:51:37 -0600 Message-ID: <001801c4fb6d$ea4e17d0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0019_01C4FB3B.9FB3A7D0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0019_01C4FB3B.9FB3A7D0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Rusty, I don't know if these will help or not, but here are = measurements of my intake which is "street" ported by Bruce T. Funny, none of those look like exhaust ports to me :-) =20 =20 Since you posted the intake runner pics, I have to speculate that Bruce = does not do anything to the size of these. If he did, it would cause you to = have to make a custom intake to match it. However, if you look at one of = these 4 port housings, you'll see that the secondary runners could be increased almost an inch at the top of the runner. I was just looking at my = intake today, and noticed that I could easily take it out a quarter of an inch = at the top, but I'm not sure how much value that would be. The runner does seem kinda small for such a large port inside. Perhaps someone who's = water does down the drain the wrong direction will comment :-) =20 =20 For the record, I am trying very hard to resist messing with the ports = on the RV-3 engine, but I can't promise success :-) But now I have a question. What are the little holes below the ports? There is a round one on the end housings and a square one on the center housing. Well, mine are rectangular on both the front and rear housing, and = larger but still rectangular on the center housing. Since my engine is in = pieces, I can tell you that these holes connect to the round holes that are = below the exhaust ports. My guess would be that these are channels for = exhaust to heat the intake manifold, but I admit that I don't really know for sure. I'm sure someone here does though. Cheers, Rusty (converting from bent mechanical flap handle to electric flaps) ------=_NextPart_000_0019_01C4FB3B.9FB3A7D0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Hi Rusty,  I don't know if these will help or = not, but here=20 are measurements of my intake which is "street" ported by Bruce = T.

Funny, = none of those=20 look like exhaust ports to me :-)  
 
Since = you posted the=20 intake runner pics, I have to speculate that Bruce does not do anything = to the=20 size of these.  If he did, it would cause you to have to make a = custom=20 intake to match it.  However, if you look at one of these 4 port = housings,=20 you'll see that the secondary runners could be increased almost an inch = at the=20 top of the runner.  I was just looking at my intake today, and = noticed that=20 I could easily take it out a quarter of an inch at the top, but I'm not = sure how=20 much value that would be.  The runner does seem kinda small for = such a=20 large port inside.  Perhaps someone who's water does down the drain = the=20 wrong direction will comment :-) 
 
For the = record, I am=20 trying very hard to resist messing with the ports on the RV-3 engine, = but I=20 can't promise success :-)

But now I have a question.  What are the little holes below the=20 ports?
There is a round one on the end housings and a square one on = the=20 center housing.

Well, = mine are=20 rectangular on both the front and rear housing, and larger but still = rectangular=20 on the center housing.  Since my engine is in pieces, I can tell = you that=20 these holes connect to the round holes that are below the exhaust = ports. =20 My guess would be that these are channels for exhaust to heat the intake = manifold, but I admit that I don't really know for sure.  I'm sure = someone=20 here does though.

Cheers,
Rusty (converting from = bent=20 mechanical flap handle to electric = flaps)
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