X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-gy0-f180.google.com ([209.85.160.180] verified) by logan.com (CommuniGate Pro SMTP 5.3.6) with ESMTP id 4250478 for flyrotary@lancaironline.net; Thu, 06 May 2010 17:51:58 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.160.180; envelope-from=archerwt@gmail.com Received: by gyb13 with SMTP id 13so290683gyb.25 for ; Thu, 06 May 2010 14:51:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=viq3OjPi2eK7ZvBGIDXa7HxzqyZR71hV4am13pkfhuU=; b=Ax9zNyBFoySp1lGbclTr+e6AwEgBcaGZpv0/YXErcZrhhS7c6aVDiU3Lq4EsvgS0aZ jKGYxKVqmSE1rc+wS+VHWO9R7u136TSjCezFIj/FVH8rcEvH6+ja28I2Zw4yIPBRsF21 3+09Zb0BPTnM9hlkCwz3x0RtrADVdG/gs607g= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=A6+ShtbetGp63C5W0xGTHhgbcEoSIoRYJRrvTtsKNXyOsdL8jX33ViiDLqY8F9MqA2 ByxKeje6c+NwP2XT0tGmTRP+WBbw5CyfimF41nIN3Tvw56ZH888NlPDEWGMwxXFsl9Ra /1JVPbSsk/uQ22CiZsIIRGv+RCzZsJRDOg2QM= MIME-Version: 1.0 Received: by 10.101.88.6 with SMTP id q6mr9555935anl.38.1273182683045; Thu, 06 May 2010 14:51:23 -0700 (PDT) Received: by 10.100.123.12 with HTTP; Thu, 6 May 2010 14:51:23 -0700 (PDT) In-Reply-To: References: Date: Thu, 6 May 2010 14:51:23 -0700 Message-ID: Subject: Re: [FlyRotary] Re: Gravity Feed From: William Archer To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=001636ed722e8ea19a0485f3f101 --001636ed722e8ea19a0485f3f101 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable It's a smaller pport that retains balanced side ports, too. Todd On Thu, May 6, 2010 at 1:50 PM, George Lendich wrote= : > > > Todd, > What do you mean by a semi PP. > George (down under) > > Bill, > Sorry, it's a high wing (Bearhawk) that won't be upside down - ever. I > figured the airframe would give me 1.5 psi for a downdraft carb; maybe 2 > psi for an updraft? I always thought I would be totally electronic but I > love the setup on my 170: all gravity from both tanks all the time. The > only fuel-related activity I have is making sure there is enough and then > regularly sumping tanks and keeping the gascolater screen clean. > > I am building a semi-pport and will try to run it with a gravity-fed Holl= ey > 2300. At worst, I might have to add a pump or go with a Marvel Schebler > MA-4/5 caliber aircraft carb. > > Todd > > > Todd, >> High wing or low wing? The key is if you have a high wing there is at >> least a minimum pressure available. Anything aerobatic or low wing will = need >> pumps. >> Bill Jepson >> >> >> >> >> >> Anyone who knows feel free to explain to me why a Marvel-Schebler updraf= t >> can feed 300 hp with gravity but pumps are needed for Webers or Holleys.= I >> understand the updraft gets another 18=94 of pressure but am assuming it= is >> simply by design that the response is improved with a few lbs of pressur= e. >> Since we aren=92t too worried about throttle response as long as it does= n=92t >> stumble, would a gravity-fed Holley be a waste of time? >> >> >> >> Todd >> >> >> >> >> > > --001636ed722e8ea19a0485f3f101 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable
It's a smaller pport that retains balanced side ports, too.
=A0
Todd
=A0


=A0
On Thu, May 6, 2010 at 1:50 PM, George Lendich <= span dir=3D"ltr"><lendich@aanet.= com.au> wrote:
=A0
=A0Todd,
What do you mean by a semi PP.
George (down under)
=A0
Bill,
Sorry, it's a high wing (Bearhawk) that won&= #39;t be upside down - ever. =A0I figured the airframe would give me 1.5 ps= i for=A0a downdraft carb; maybe 2 psi=A0for an updraft?=A0 I always thought= I would be totally electronic but I love the setup on my 170: all gravity = from both tanks all the time.=A0 The only fuel-related activity I have is m= aking sure there is enough and then regularly sumping tanks and keeping the= gascolater screen clean.
=A0
I am building a semi-pport and will try to run i= t with a gravity-fed Holley 2300.=A0 At worst, I might have to add a pump o= r go with a Marvel Schebler MA-4/5 caliber aircraft carb.
=A0
Todd
=A0

Todd,
High wing or low = wing? The key is if you have a high wing there is at least a minimum pressu= re available. Anything aerobatic or low wing will need pumps.
Bill Jepso= n=A0=20

=A0

<= /div>

Anyone who knows feel = free to explain to me why a Marvel-Schebler updraft can feed 300 hp with gr= avity but pumps are needed for Webers or Holleys.=A0 I understand the updra= ft gets another 18=94 of pressure but am assuming it is simply by design th= at the response is improved with a few lbs of pressure.=A0 Since we aren=92= t too worried about throttle response as long as it doesn=92t stumble, woul= d a gravity-fed Holley be a waste of time?

=A0

Todd

=

=A0

<= /div>

=A0

<= /div>


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