Return-Path: Received: from [206.46.252.48] (HELO vms048pub.verizon.net) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 762277 for flyrotary@lancaironline.net; Sun, 27 Feb 2005 23:24:58 -0500 Received: from [65.239.57.213] ([65.239.57.225]) by vms048.mailsrvcs.net (Sun Java System Messaging Server 6.2 HotFix 0.04 (built Dec 24 2004)) with ESMTPA id <0ICL006W3TL7UO20@vms048.mailsrvcs.net> for flyrotary@lancaironline.net; Sun, 27 Feb 2005 22:24:47 -0600 (CST) Date: Sun, 27 Feb 2005 20:30:30 -0800 From: Ken Welter Subject: [FlyRotary] Re: Weber Mixture control In-reply-to: X-Sender: res0c5l1@incoming.verizon.net To: "Rotary motors in aircraft" Message-id: MIME-version: 1.0 Content-type: multipart/alternative; boundary="============_-1102557442==_ma============" References: --============_-1102557442==_ma============ Content-Type: text/plain; charset="us-ascii" ; format="flowed" There is also a system used on snowmobiles that uses air bleed from the intake manifold that adjusts the mixture but I have not looked at it close vet but I have thought about playing with it. There are two types, one is an after market kit called Dial-a-jet and the other is a factory setup that is automatically controlled by a computer. I have never heard of anyone making anything for a Weber however. Also I will note that a Weber differs from a crude aircraft carb or a Holly in that its very sensitive to air velocity and pressure, less air going through the Venturi will give you less gas so it compensates for alt to some degree compared to them crude carbs. Ken >Hi, Ken thanks for the information. I did save a similar message >that you previously sent describing how you used ram air to control >the mixture on your Weber. If required, I could probably construct a >similar system (If I pestered you with a few more questions). I was >just hoping there was a simple solution, such as someone who came up >with a mechanical lever type mixture modification for the Weber. I >could easily weld or machine a slot in the mixture adjustment screw >and attach a cable, but I suspect that the mixture screw would need >to be turned in or out several turns, which a simple lever attached >to the mixture screw would not accomplish. It might possibly turn >the mixture screw 1/2 to 3/4 turn at max, which I suspect would not >be sufficient enough to lean the carb enough for higher altitude. >Thanks again for your input. I have also saved this posting just in >case. sincerely, Paul Conner --============_-1102557442==_ma============ Content-Type: text/html; charset="us-ascii" [FlyRotary] Re: Weber Mixture control

   There is also a system used on snowmobiles that uses air bleed from the intake manifold that adjusts the mixture but I have not looked at it close vet but I have thought about playing with it.
 There are two types, one is an after market kit called Dial-a-jet and the other is a factory setup that is automatically controlled by a computer.
 I have never heard of anyone making anything for a Weber however.
 Also I will note that a Weber differs from a crude aircraft carb or a Holly in that its very sensitive to air velocity and pressure, less air going through the Venturi will give you less gas so it compensates for alt to some degree compared to them crude carbs.
  Ken





Hi, Ken thanks for the information. I did save a similar message that you previously sent describing how you used ram air to control the mixture on your Weber. If required, I could probably construct a similar system (If I pestered you with a few more questions). I was just hoping there was a simple solution, such as someone who came up with a mechanical lever type mixture modification for the Weber. I could easily weld or machine a slot in the mixture adjustment screw and attach a cable, but I suspect that the mixture screw would need to be turned in or out several turns, which a simple lever attached to the mixture screw would not accomplish. It might possibly turn the mixture screw 1/2 to 3/4 turn at max, which I suspect would not be sufficient enough to lean the carb enough for higher altitude. Thanks again for your input. I have also saved this posting just in case. sincerely,  Paul Conner

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