Return-Path: <13brv3@bellsouth.net> Received: from imf24aec.mail.bellsouth.net ([205.152.59.72] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2899029 for flyrotary@lancaironline.net; Sat, 20 Dec 2003 21:06:23 -0500 Received: from rad ([68.212.7.74]) by imf24aec.mail.bellsouth.net (InterMail vM.5.01.06.05 201-253-122-130-105-20030824) with ESMTP id <20031221020622.YNED13947.imf24aec.mail.bellsouth.net@rad> for ; Sat, 20 Dec 2003 21:06:22 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "Flyrotary List" Subject: Dumb intake question Date: Sat, 20 Dec 2003 20:06:22 -0600 Message-ID: <022a01c3c767$089a1360$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_022B_01C3C734.BDFFA360" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_022B_01C3C734.BDFFA360 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Greetings, =20 OK, I have my dunce cap on, since I ignored the previous intake = lectures. =20 =20 Say you have TB that has two butterflies, and each butterfly feeds one = rotor (primary and secondary). There is no connection between the two rotors. = Is the length of the intake runner important for full throttle operations? = =20 I assume it is, and recall that racing manifolds can have a short, = almost non-existent runner. I believe Ed used one of these originally, and got less than exceptional performance. If I recall correctly, it was = decided that it would have been fine at racing RPM, but not 5500 or so, where he wanted to run. =20 =20 Assuming it's important, is there a rule of thumb for the length of the runner for a particular rpm range? I'm wondering if I can keep my TB in = the (turbo free) left cheek, and get enough runner length to optimize = operation at about 7500 rpm. Probably a silly idea, but my only other option is = still trying to sneak it under the cowl to the right cheek. =20 Thanks, Rusty (I can already hear Ed screaming ) =20 ------=_NextPart_000_022B_01C3C734.BDFFA360 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message
Greetings,
 
OK, I have my = dunce cap on,=20 since I ignored the previous intake lectures. 
 
Say you = have TB that=20 has two butterflies, and each butterfly feeds one rotor (primary and=20 secondary).  There is no connection between the=20 two rotors.  Is the length of the intake runner important = for=20 full throttle operations?  
 
I assume it is, = and recall=20 that racing manifolds can have a short, almost non-existent = runner.  I=20 believe Ed used one of these originally, and got less than = exceptional=20 performance.  If I recall correctly, it was decided that it would = have been=20 fine at racing RPM, but not 5500 or so, where he wanted to run. =20
 
Assuming it's = important, is=20 there a rule of thumb for the length of the runner for a particular rpm=20 range?  I'm wondering if I can keep my TB in the (turbo free) left = cheek,=20 and get enough runner length to optimize operation at = about 7500=20 rpm.  Probably a silly idea, but my only other option is still = trying to=20 sneak it under the cowl to the right cheek.
 
Thanks,
Rusty (I can = already hear=20 Ed screaming <g>)
      =20
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