X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-iy0-f180.google.com ([209.85.210.180] verified) by logan.com (CommuniGate Pro SMTP 5.4.1) with ESMTPS id 5111010 for flyrotary@lancaironline.net; Thu, 01 Sep 2011 18:41:06 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.210.180; envelope-from=rwstracy@gmail.com Received: by iabz7 with SMTP id z7so3828241iab.25 for ; Thu, 01 Sep 2011 15:40:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=subject:references:from:content-type:x-mailer:in-reply-to :message-id:date:to:content-transfer-encoding:mime-version; bh=G6TtUFbRTfmhBFQoQA3fSduitbOMjp5FqDXyYYiXRm4=; b=JfMDC7ThgxnalYdwCKm9RWGljlQqA2+TBiMwz7upFwdStImmiu+PaZqcKvpUQKx4Eq 6Hr3AC7K6Bd/cIhrqLlPHdy+dvIJKLK9gVVjhMIdw0sgSrMRDlEQx76SH1A4zkNUxCfx NsGQehgtsy3j1AqAZqrjh2lcq8zYgP75UOA5U= Received: by 10.231.42.133 with SMTP id s5mr714458ibe.34.1314916830234; Thu, 01 Sep 2011 15:40:30 -0700 (PDT) Return-Path: Received: from [75.202.123.185] (185.sub-75-202-123.myvzw.com [75.202.123.185]) by mx.google.com with ESMTPS id g21sm94973ibl.24.2011.09.01.15.40.26 (version=TLSv1/SSLv3 cipher=OTHER); Thu, 01 Sep 2011 15:40:28 -0700 (PDT) Subject: Re: [FlyRotary] Re: Pump Suck Lock? References: From: Tracy Content-Type: multipart/alternative; boundary=Apple-Mail-1--545305558 X-Mailer: iPad Mail (8F191) In-Reply-To: Message-Id: Date: Thu, 1 Sep 2011 18:40:23 -0400 To: Rotary motors in aircraft Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (iPad Mail 8F191) --Apple-Mail-1--545305558 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii So there's no issues with hot soaked restarts of an EFI engine? Not in my experience, and I'm using dead ended fuel rails. =20 2. We have a pair of Walbro GSL393 EFI pumps, suitable for in or out of tank= mounting though I am curious how they were tank mounted. Beats me.... =20 3. Check valves. I thought that these pumps would not free flow either direc= tion if shut off thereby not needing check valves? Don't think they are necessary, I've never used them. =20 4. If an EFI pump were mounted in a sump of approximately 1.5 qt capacity, t= his fed by a low volume/low pressure Facet pump from the main tank, between t= he heat generated by the pump itself and picked up in the circuit, would the= flow of the facet pump replenishing used fuel with the excess returning to t= he main tank keep the pump, sump and circuit fuel at a reasonable temp? What= would the minimum volume be? Keep in mind that the circuit fuel is mixing with the replenished fuel so so= me heat is going as overflow back to the main tanks. Sumps can work but frequently require fixes for their drawbacks. If you do= n't have a really good reason for needing one, why use one? Tracy Sent from my iPad On Sep 1, 2011, at 5:51 PM, CozyGirrrl@aol.com wrote: > So there's no issues with hot soaked restarts of an EFI engine? > =20 > 2. We have a pair of Walbro GSL393 EFI pumps, suitable for in or out of ta= nk mounting though I am curious how they were tank mounted. > =20 > 3. Check valves. I thought that these pumps would not free flow either dir= ection if shut off thereby not needing check valves? > =20 > 4. If an EFI pump were mounted in a sump of approximately 1.5 qt capacity,= this fed by a low volume/low pressure Facet pump from the main tank, betwee= n the heat generated by the pump itself and picked up in the circuit, would t= he flow of the facet pump replenishing used fuel with the excess returning t= o the main tank keep the pump, sump and circuit fuel at a reasonable temp? W= hat would the minimum volume be? > Keep in mind that the circuit fuel is mixing with the replenished fuel so s= ome heat is going as overflow back to the main tanks. --Apple-Mail-1--545305558 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8
So there's no issues with hot soaked restarts of an EFI engine?
<= br>
Not in my experience, and I'm using dead ended fuel rails.
 
2. We have a pair of Walbro GSL393 EFI pumps, suitab= le for in or out of tank mounting though I am curious how they were tan= k mounted.

Beats me....
 
= 3. Check valves. I thought that these pumps would not free flow either direc= tion if shut off thereby not needing check valves?

= Don't think they are necessary, I've never used them.
 
=
4. If an EFI pump were mounted in a sump of approximately 1.5 qt capaci= ty, this fed by a low volume/low pressure Facet pump from the main tank, bet= ween the heat generated by the pump itself and picked up in the circuit, wou= ld the flow of the facet pump replenishing used fuel with the excess returni= ng to the main tank keep the pump, sump and circuit fuel at a reasonable tem= p? What would the minimum volume be?
Keep in mind that the circuit= fuel is mixing with the replenished fuel so some heat is going as overflow b= ack to the main tanks.

Sumps can work but frequentl= y require fixes for their drawbacks.   If you don't have a really good r= eason for needing one, why use one?

Tracy

Sent from my iPad

On Sep 1, 2011, at 5:51 PM, CozyGirrrl@aol.com wrote:

So there's no issues with hot soaked restarts of a= n EFI engine?
 
2. We have a pair of Walbro GSL393 EFI pumps, suitable for in or o= ut=20 of tank mounting though I am curious how they were tank mounted.
 
3. Check valves. I thought that these pumps would not free flow either=20= direction if shut off thereby not needing check valves?
 
4. If an EFI pump were mounted in a sump of approximately 1.5 qt capaci= ty,=20 this fed by a low volume/low pressure Facet pump from the main tank, between= the=20 heat generated by the pump itself and picked up in the circuit, would the fl= ow=20 of the facet pump replenishing used fuel with the excess returning to the ma= in=20 tank keep the pump, sump and circuit fuel at a reasonable temp? What would t= he=20 minimum volume be?
Keep in mind that the circuit fuel is mixing with the replenished fuel s= o=20 some heat is going as overflow back to the main tanks.
= --Apple-Mail-1--545305558--