X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-wy0-f180.google.com ([74.125.82.180] verified) by logan.com (CommuniGate Pro SMTP 5.3.11) with ESMTP id 4656100 for flyrotary@lancaironline.net; Mon, 27 Dec 2010 19:31:02 -0500 Received-SPF: pass receiver=logan.com; client-ip=74.125.82.180; envelope-from=rwstracy@gmail.com Received: by wyb28 with SMTP id 28so8797350wyb.25 for ; Mon, 27 Dec 2010 16:30:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:sender:received :in-reply-to:references:date:x-google-sender-auth:message-id:subject :from:to:content-type; bh=qRlgfSwY/zSWLABzABTFUfTHL7iTTbs9XTEgCZ6I74I=; b=gMYVIlLxkCNfHiKwWOnqnhiXuUofffzeRuxXONo5YOGFUuEZT1CaZkturBAgleUIk7 q+FPEm4DiCrmtmYkVyKBBEgye9CbOxTFdjP+gNcsJcld2kg4AugHPXTSkAcYsn+C3FLj 3M5Dg51oHrDMemAoRKtl67ZeZGmhHogpVf6Js= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:content-type; b=G+QWyN31Q5FhCoEf+IF1dG0N3gc4PHcwgsDeCNMXbFpCnrSJyQhvj9zWnMycN6ZEhj XGjfP5SDFXTJX/RbUune0+7xqGbSD1IsI2o83BFSMwLLTu7XtwNm7s6MMez+JYe+LQMw Q4Kc3gnsbmj//AHWFafzeTifNHdfxadkPmBjY= MIME-Version: 1.0 Received: by 10.216.174.65 with SMTP id w43mr16218312wel.95.1293496227010; Mon, 27 Dec 2010 16:30:27 -0800 (PST) Sender: rwstracy@gmail.com Received: by 10.216.200.158 with HTTP; Mon, 27 Dec 2010 16:30:26 -0800 (PST) In-Reply-To: References: Date: Mon, 27 Dec 2010 19:30:26 -0500 X-Google-Sender-Auth: JWM_CSOh59Lm5ZfdcPi8mKUPB6I Message-ID: Subject: Re: [FlyRotary] Re: Fuel rail pressure From: Tracy To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=001485f1d87621186904986d8f2f --001485f1d87621186904986d8f2f Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Just for another data point: I installed the fuel pressure regulator prior to the fuel rails in my 20B installation so there is no fuel flow to flush vapor from the rails on hot startups. This arrangement is now used on most new cars. Even with this arrangement I have had no trouble with vapor lock. Even if it should happen, the EC2/3 primer function would be able to vent the vapor from the rails. This setup allows the use of a Floscan type fuel flow sensor with the EM2/3 since there is no return flow from the fuel rails. No big advantage other than being much easier to calibrate. Tracy On Mon, Dec 27, 2010 at 6:53 PM, wrote: > It seems to me that the fuel would have to be pretty hot for the vapor > pressure to exceed 40 psi and cause vapor lock. Running the fuel pump in > such a case would cause coller fuel to flow through the rail and back to = the > tank. > > Brian Trubee > > > > -----Original Message----- > From: Al Gietzen > To: Rotary motors in aircraft > Sent: Mon, Dec 27, 2010 3:49 pm > Subject: [FlyRotary] Fuel rail pressure > > > Also remember that when you are starting the engine you are starting it > under a load. This is different then in a car config where in a car you = are > starting it with no load attached to the crankshaft. If the fuel rails a= re > getting so hot that they are vaporizing I would think this would cause an > excess pressure in the fuel system and be very dangerous. This is not a > problem I have ever had in a car. What is causing this besides poor > ventilation? > The pressure in the fuel rail can never exceed the setting of the pressur= e > regulator; which should bear about 40 psi engine off. That=92s true even = if > you call the e-shaft a crankshaftJ. > Al > > --001485f1d87621186904986d8f2f Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Just for another data point:

I installed the fuel pressure regulator= prior to the fuel rails in my 20B installation so there is no fuel flow to= flush vapor from the rails on hot startups.=A0 This arrangement is now use= d on most new cars.=A0 Even with this arrangement I have had no trouble wit= h vapor lock.=A0=A0 Even if it should happen, the EC2/3=A0 primer function = would be able to vent the vapor from the rails.

This setup allows the use of a Floscan type fuel flow sensor with the E= M2/3 since there is no return flow from the fuel rails.=A0 No big advantage= other than being much easier to calibrate.

Tracy

On Mon, Dec 27, 2010 at 6:53 PM, <bktrub@aol.com> wrote:
It seems to me that the fuel would have to be pretty hot for the vapor= pressure to exceed 40 psi and cause vapor lock. Running the fuel pump in s= uch a case would cause coller fuel to flow through the rail and back to the= tank.
=A0
Brian Trubee



-----Original Message-----
From: Al Gietzen <ALVentures@cox.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Mon, Dec 27, 2010 3:49 pm
Subject: [FlyRotary] Fuel rail pressure

=A0
Also remember that when you are starting the engine y= ou are starting it under a load. =A0This is different then in a car config = where in a car you are starting it with no load attached to the crankshaft.= =A0If the fuel rails are getting so hot that they are vaporizing I would t= hink this would cause an excess pressure in the fuel system and be very dan= gerous. =A0This is not a problem I have ever had in a car. =A0What is causi= ng this besides poor ventilation?
The pressure in the fuel rail can never exceed the s= etting of the pressure regulator; which should bear about 40 psi engine off= . That=92s true even if you call the e-shaft a crankshaftJ.
Al
=A0

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