Return-Path: Received: from out008.verizon.net ([206.46.170.108] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2972105 for flyrotary@lancaironline.net; Tue, 03 Feb 2004 00:13:39 -0500 Received: from [67.225.117.132] ([67.225.117.167]) by out008.verizon.net (InterMail vM.5.01.06.06 201-253-122-130-106-20030910) with ESMTP id <20040203051337.DNTR10003.out008.verizon.net@[67.225.117.132]> for ; Mon, 2 Feb 2004 23:13:37 -0600 Mime-Version: 1.0 X-Sender: res0c5l1@incoming.verizon.net Message-Id: In-Reply-To: References: Date: Mon, 2 Feb 2004 21:14:57 -0800 To: "Rotary motors in aircraft" From: Ken Welter Subject: [FlyRotary] Re: Non-EFI fuel systems Content-Type: multipart/alternative; boundary="============_-1136337147==_ma============" X-Authentication-Info: Submitted using SMTP AUTH at out008.verizon.net from [67.225.117.167] at Mon, 2 Feb 2004 23:13:35 -0600 --============_-1136337147==_ma============ Content-Type: text/plain; charset="us-ascii" ; format="flowed" > 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. > >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. > >You did a fine job making that high flow manifold and I bet you wont >put a 350 CFM throttle body on it. > >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. > > 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. > >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. > >Rusty (my 4A084 won't have EFI or an Ellison) It has been many years since I have talked to Elison so maybe they make a bigger model now but at that time the biggest was a 1.5 inch or 37.5mm bore and for the rotary you would need at least 70mm bore for a single throat so if they make something that size I think it would work fine but I have never seen an Elison on any rotary and there are many Webers out there so they are a proven. Also at the $1500 price tag they want for the Elison its a bit spendy to hope it will work. Ken --============_-1136337147==_ma============ Content-Type: text/html; charset="us-ascii" [FlyRotary] Re: Non-EFI fuel systems
  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.      
 
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.   
 
You did a fine job making that high flow manifold and I bet you wont put a 350 CFM throttle body on it. 
 
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. 
 
 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. 
 
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. 
 
Rusty (my 4A084 won't have EFI or an Ellison)

  It has been many years since I have talked to Elison so maybe they make a bigger model now but at that time the biggest was a 1.5 inch or 37.5mm bore and for the rotary you would need at least 70mm bore for a single throat so if they make something that size I think it would work fine but I have never seen an Elison on any rotary and there are many Webers out there so they are a proven.
 Also at the $1500 price tag they want for the Elison its a bit spendy to hope it will work.

  Ken
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