Return-Path: Received: from imf22aec.mail.bellsouth.net ([205.152.59.70] verified) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 762172 for flyrotary@lancaironline.net; Sun, 27 Feb 2005 21:38:22 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.70; envelope-from=sqpilot@bellsouth.net Received: from [216.78.115.67] by imf22aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050228023736.FFIK2068.imf22aec.mail.bellsouth.net@[216.78.115.67]> for ; Sun, 27 Feb 2005 21:37:36 -0500 Received: from 127.0.0.1 (AVG SMTP 7.0.300 [266.5.0]); Sun, 27 Feb 2005 20:37:24 -0600 Message-ID: <007201c51d3e$6c937c70$43734ed8@paul52u7f5qyav> From: "Paul" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Weber carburetors Date: Sun, 27 Feb 2005 20:37:19 -0600 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="=======AVGMAIL-422283E46F5C=======" --=======AVGMAIL-422283E46F5C======= Content-Type: multipart/alternative; boundary="----=_NextPart_000_006F_01C51D0C.21BFD400" ------=_NextPart_000_006F_01C51D0C.21BFD400 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Thanks, Tom....Fortunately I was already aware of that. That is one of = the reasons that the Marvel aircraft carburetors have manual mixture = controls. I will check with Yaw Power Products just in case they may = know of an manual mixture conversion kit or ??? thanks again. Paul = Conner ----- Original Message -----=20 From: Tom=20 To: Rotary motors in aircraft=20 Sent: Sunday, February 27, 2005 6:49 PM Subject: [FlyRotary] Re: Weber carburetors Hi Paul, There's something you might want to read regarding tuning carburetors = for getting ultimate performance out of them. I think Leon already = mentioned carb jets.=20 The short of it: 1) the best carb jet to be used can be effected by atmospheric = conditions and the inevitable change in fuel regulator pressure, Being = in an airplane confuses the situation.=20 2) apparently fuel regulators don't usually keep the same pressure = over time, they recommend a pressure monitor and adjustible fuel = pressure regulator. Occasionally you would want to re-adjust the = pressure=20 http://www.yawpower.com/racecarb.html and then... http://www.yawpower.com/secret.html Also, they offer carburetor, pump, & regulator packages. Probably no = pilot-adjustable mixture control.=20 Tom, just a parrot =20 Paul wrote: I am still looking at carburetors for my 13b. I haven't decided to = ditch the EFI yet, as I have the maps set up now and it seems to be = producing good power, and runs smoothly. After talking to George = Graham, and seeing that Ron Gowan also had a carb on a 13b, (as well as = Finn and I believe the gentleman who had a Coot amphibian), it would = seem that there are some success stories with a rotary and a carb. Now that we are talking about PM alternators, with around 35 = amps, it would seem that if I had a carburetor instead of EFI, my = electrical current needs would be considerably less. (No injectors to = fire, no high pressure fuel pumps, etc). I could also eliminate the = need for a fuel return line to sump tank, handheld ECU programmer, etc. = =20 Of course there are downsides to carburetors as well, such as = the need to provide inflight leaning of the mixture and carb heat. The = carb heat is the easy part. (not very far from the exhaust). The real = challenge would be providing for inflight leaning of the mixture. If = anyone has seen a succesful modification of a Weber carb for inflight = leaning, I would appreciate any info you might have? Thanks in advance = for any and all replies. Paul Conner No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 266.5.0 - Release Date: 2/25/2005 >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html -------------------------------------------------------------------------= ----- Do you Yahoo!? Yahoo! Mail - You care about security. So do we. -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 266.5.0 - Release Date: 2/25/2005 ------=_NextPart_000_006F_01C51D0C.21BFD400 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Thanks, Tom....Fortunately I was = already aware of=20 that. That is one of the reasons that the Marvel aircraft carburetors = have=20 manual mixture controls.  I will check with Yaw Power Products just = in case=20 they may know of an manual mixture conversion kit or ???  thanks=20 again.  Paul Conner
 
----- Original Message -----
From:=20 Tom
Sent: Sunday, February 27, 2005 = 6:49=20 PM
Subject: [FlyRotary] Re: Weber=20 carburetors

Hi Paul,
There's something you might want to read regarding tuning = carburetors for=20 getting ultimate performance out of them.  I think Leon already = mentioned=20 carb jets. 
 
The short of it:
1) the best carb jet to be used can be effected = by atmospheric=20 conditions and the inevitable change in fuel regulator=20 pressure,   Being in an airplane confuses the situation. =
2) apparently fuel regulators don't usually keep the same = pressure over=20 time, they recommend a pressure monitor and adjustible fuel pressure=20 regulator.  Occasionally you would want to re-adjust the=20 pressure 
 
http://www.yawpower.com/ra= cecarb.html
 
and then...
 
http://www.yawpower.com/secr= et.html
 
Also, they offer carburetor, pump, & regulator = packages. =20 Probably no pilot-adjustable mixture control.
 
Tom,  just a parrot
  
 

Paul <sqpilot@bellsouth.net> wrote:
I am still looking at carburetors = for my=20 13b.  I haven't decided to ditch the EFI yet, as I have the = maps set up=20 now and it seems to be producing good power, and runs = smoothly.  =20 After talking to George Graham, and seeing that Ron Gowan also had a = carb on=20 a 13b, (as well as Finn and I believe the gentleman who had a Coot=20 amphibian), it would seem that there are some success stories with a = rotary=20 and a carb.
    Now that we are = talking=20 about PM alternators, with around 35 amps, it would seem that if I = had a=20 carburetor instead of EFI, my electrical current needs would be = considerably=20 less. (No injectors to fire, no high pressure fuel pumps, = etc).  I=20 could also eliminate the need for a  fuel return line to = sump=20 tank, handheld ECU programmer, etc.     =20
     Of course = there are=20 downsides to carburetors as well, such as the need to provide = inflight=20 leaning of the mixture and carb heat.  The carb heat is the = easy part.=20 (not very far from the exhaust). The real challenge would be = providing for=20 inflight leaning of the mixture.  If anyone has seen a = succesful=20 modification of a Weber carb for inflight leaning, I would = appreciate any=20 info you might have?  Thanks in advance for any and all = replies. =20 Paul Conner
No virus found in this outgoing = message.
Checked=20 by AVG Anti-Virus.
Version: 7.0.300 / Virus Database: 266.5.0 - = Release=20 Date: 2/25/2005
>> Homepage: = http://www.flyrotary.com/
>>=20 Archive: = http://lancaironline.net/lists/flyrotary/List.html

Do you Yahoo!?
Yahoo!=20 Mail - You care about security. So do we.

No virus found in this incoming message.
Checked by AVG=20 Anti-Virus.
Version: 7.0.300 / Virus Database: 266.5.0 - Release = Date:=20 2/25/2005
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