Return-Path: <13brv3@bellsouth.net> Received: from imf22aec.mail.bellsouth.net ([205.152.59.70] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2971933 for flyrotary@lancaironline.net; Mon, 02 Feb 2004 22:25:08 -0500 Received: from rad ([65.0.149.108]) by imf22aec.mail.bellsouth.net (InterMail vM.5.01.06.05 201-253-122-130-105-20030824) with ESMTP id <20040203032458.WLGU1950.imf22aec.mail.bellsouth.net@rad> for ; Mon, 2 Feb 2004 22:24:58 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Non-EFI fuel systems Date: Mon, 2 Feb 2004 21:22:56 -0600 Message-ID: <03c901c3ea05$04b39580$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_03CA_01C3E9D2.BA192580" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_03CA_01C3E9D2.BA192580 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Sorry to say but I think you are dead wrong on the need for high = airflow on the rotary and there is no way 350 CFM will work unless you want to = fly a turd. =20 =20 Fair enough. I can certainly agree, to disagree. I'm not sure which Ellison you're referring to, with the 350 CFM number, but I would = absolutely bolt an EFS 4-5 to a NA 13B in a heartbeat. =20 =20 You did a fine job making that high flow manifold and I bet you wont put = a 350 CFM throttle body on it.=20 =20 TWM doesn't publish CFM ratings that I know of, but I got a TWM 3000, = with 55 mm bores. The ONLY reason I got that size was that it came with dual fuel rails, and 4 injectors. I was really tired of not having matching injectors. =20 =20 For anyone thinking of a Weber I will say there are pros and cons = between a 48 and a 51, the 51 puts out more power but it is temperamental on = jetting and it runs rough on the bottom end compared to the 48, This is really the classic hot rod carb theory. Put a 1050 Holley = double pumper on a chevy 350, and it will have the best possible WOT power, but drivability will suffer, since it's too large to precisely control the = low throttle requirements. Put a 600 on it, and you'll lose a tiny bit of = high end, but gain throttle response everywhere else. =20 =20 All that being said, I can't help but agree that we care more about high end, than low and mid range throttle. Still, I think the Ellison would = make a fine choice, even if you get one of the "too big" sizes. =20 =20 Rusty (my 4A084 won't have EFI or an Ellison) ------=_NextPart_000_03CA_01C3E9D2.BA192580 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
  Sorry to say but I think you are dead wrong on the need for = high=20 airflow on the rotary and there is no way 350 CFM will work unless you = want to=20 fly a turd.      
 
Fair=20 enough.  I can certainly agree, to disagree.  I'm not sure = which=20 Ellison you're referring to, with the 350 CFM number, but I would = absolutely=20 bolt an EFS 4-5 to a NA 13B in a heartbeat. =20  
 
You did a fine job making that high flow manifold and I bet you = wont put a=20 350 CFM throttle body on it. 
 
TWM doesn't=20 publish CFM ratings that I know of, but I got a TWM 3000, with 55 mm=20 bores.  The ONLY reason I got that size was that it came with dual = fuel=20 rails, and 4 injectors.  I was really tired of not having = matching injectors.   
 
 For anyone thinking of a Weber I will say there are pros and = cons=20 between a 48 and a 51, the 51 puts out more power but it is = temperamental on=20 jetting and it runs rough on the bottom end compared to the 48,

This is=20 really the classic hot rod carb theory.  Put a 1050 Holley double=20 pumper on a chevy 350, and it will have the best possible WOT = power, but=20 drivability will suffer, since it's too large to precisely control = the low=20 throttle requirements.  Put a 600 on it, and you'll lose a tiny bit = of high=20 end, but gain throttle response everywhere else.  =
 
All that=20 being said, I can't help but agree that we care more about high = end, than=20 low and mid range throttle.  Still, I think the Ellison would make = a fine=20 choice, even if you get one of the "too big" sizes.  =
 
Rusty (my=20 4A084 won't have EFI or an Ellison)
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