X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from pan.gwi.net ([207.5.128.165] verified) by logan.com (CommuniGate Pro SMTP 5.2.1) with ESMTPS id 2813306 for flyrotary@lancaironline.net; Sat, 22 Mar 2008 11:45:57 -0400 Received-SPF: pass receiver=logan.com; client-ip=207.5.128.165; envelope-from=silvius@gwi.net Received: from yourlk4rlmsu41 (bb-216-195-174-159.gwi.net [216.195.174.159]) by pan.gwi.net (8.13.1/8.13.1) with SMTP id m2MFjEHQ024125 for ; Sat, 22 Mar 2008 11:45:17 -0400 (EDT) (envelope-from silvius@gwi.net) Message-ID: <011501c88c3c$1df067c0$9faec3d8@yourlk4rlmsu41> From: "Michael Silvius" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Gravity fed carb? peer review Date: Sat, 22 Mar 2008 11:45:17 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0112_01C88C12.333B1870" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1807 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1807 This is a multi-part message in MIME format. ------=_NextPart_000_0112_01C88C12.333B1870 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Tracy: The three Mikuni set up works, as you and and Fin Lassen have proven so = that is always my fall back if I choose to stay with carbs.=20 Mixture distribution issues apply to the Corvair conversion with its = long runners, low mounted carb and its six cylinders. Those with = individual cyl head and EGT probes have noted some great variation in = indications between cylinders. In order to correct this some of the = folks have played around successfully with the "Tornado fuel saver" = device theorizing mixture distribution as the source of the problem. A = little fan shaped insert that swirls the mixture after the carb and it = may be something to look at in this case. In the end it may just be a = mater of building it and see what it does with no or minimal = expectations. It will be a good point to consider when assessing performance. thanks: Michael ----- Original Message -----=20 From: Tracy Crook=20 To: Rotary motors in aircraft=20 Sent: Friday, March 21, 2008 7:28 PM Subject: [FlyRotary] Re: Gravity fed carb? peer review A big factor in carb manifold design is mixture distribution. Not = always easy. That was the object of those horrid T shaped junctions = seen on some aero VW conversions. Really bad turbulance and pressure = loss but it mixed up the mixture pretty good. The advantage of using = separate barrels (or carbs) for each rotor is that mixture distribution = is assured. =20 Aside from that, your runners are very short so not a lot of ram = tuning effect. The long single runner from the carb doesn't count as it = contributes nothing to tuning. But if all you need is 150 - 160 HP it = will work OK (assuming you do get good mixture distribution). ------=_NextPart_000_0112_01C88C12.333B1870 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Tracy:
 
The three Mikuni set up works, as you = and and Fin=20 Lassen have proven so that is always my fall back if I choose to stay = with=20 carbs.
 
Mixture distribution issues apply to = the Corvair=20 conversion with its long runners, low mounted carb and its six = cylinders.=20 Those with individual cyl head and EGT probes have noted some great = variation in=20 indications between cylinders. In order to correct this some of the=20 folks have played around successfully with the "Tornado fuel saver" = device=20 theorizing mixture distribution as the source of the problem. A little = fan=20 shaped insert that swirls the mixture after the carb and it may be = something to=20 look at in this case. In the end it may just be a mater of  = building it and=20 see what it does with no or minimal expectations.
It will  be a good point to = consider when=20 assessing performance.
 
thanks:
 
Michael
----- Original Message -----
From:=20 Tracy=20 Crook
Sent: Friday, March 21, 2008 = 7:28=20 PM
Subject: [FlyRotary] Re: = Gravity fed=20 carb? peer review

A big factor in carb manifold design is mixture=20 distribution.  Not always easy.  That was the object of = those=20 horrid T shaped junctions seen on some aero VW conversions.  = Really=20 bad turbulance and pressure loss but it mixed up the mixture pretty=20 good.  The advantage of using separate barrels (or = carbs) for=20 each rotor is that mixture distribution is assured.  =20
Aside from that, your runners are very short so not a lot of ram = tuning=20 effect.  The long single runner from the carb doesn't count as it = contributes nothing to tuning.   But if all you need is 150 = - 160 HP=20 it will work OK (assuming you do get good mixture = distribution).
 
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