X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imr-db02.mx.aol.com ([205.188.91.96] verified) by logan.com (CommuniGate Pro SMTP 5.3.11) with ESMTP id 4656231 for flyrotary@lancaironline.net; Tue, 28 Dec 2010 00:11:23 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.91.96; envelope-from=Bktrub@aol.com Received: from imo-da01.mx.aol.com (imo-da01.mx.aol.com [205.188.169.199]) by imr-db02.mx.aol.com (8.14.1/8.14.1) with ESMTP id oBS5AKg5001574 for ; Tue, 28 Dec 2010 00:10:20 -0500 Received: from Bktrub@aol.com by imo-da01.mx.aol.com (mail_out_v42.9.) id q.e63.88de138 (43979) for ; Tue, 28 Dec 2010 00:10:10 -0500 (EST) Received: from smtprly-db02.mx.aol.com (smtprly-db02.mx.aol.com [205.188.249.153]) by cia-dd04.mx.aol.com (v129.7) with ESMTP id MAILCIADD044-5c354d19712f2f8; Tue, 28 Dec 2010 00:10:10 -0500 Received: from webmail-m022 (webmail-m022.sim.aol.com [64.12.183.103]) by smtprly-db02.mx.aol.com (v129.5) with ESMTP id MAILSMTPRLYDB023-5c354d19712f2f8; Tue, 28 Dec 2010 00:10:07 -0500 References: To: flyrotary@lancaironline.net Subject: Re: [FlyRotary] Re: Fuel rail pressure Date: Tue, 28 Dec 2010 00:10:07 -0500 X-AOL-IP: 108.3.31.54 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: bktrub@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8CD7464A0C207D0_F24_53F0E_webmail-m022.sysops.aol.com" X-Mailer: AOL Webmail 33069-STANDARD Received: from 108.3.31.54 by webmail-m022.sysops.aol.com (64.12.183.103) with HTTP (WebMailUI); Tue, 28 Dec 2010 00:10:07 -0500 Message-Id: <8CD7464A0BD450C-F24-23D86@webmail-m022.sysops.aol.com> X-Spam-Flag:NO X-AOL-SENDER: Bktrub@aol.com ----------MB_8CD7464A0C207D0_F24_53F0E_webmail-m022.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Tracy, did you ever find a suitable replacement fuel pressure sender? What are yo= u using now? Thanks, Brian Trubee -----Original Message----- From: Tracy To: Rotary motors in aircraft Sent: Mon, Dec 27, 2010 4:30 pm Subject: [FlyRotary] Re: Fuel rail pressure 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 ho= t startups. This arrangement is now used on most new cars. Even with thi= s 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 oth= er 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 pre= ssure 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.=20 =20 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 =20 Also remember that when you are starting the engine you are starting it un= der 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= are getting so hot that they are vaporizing I would think this would caus= e an excess pressure in the fuel system and be very dangerous. This is no= t 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 pressure= regulator; which should bear about 40 psi engine off. That=E2=80=99s true= even if you call the e-shaft a crankshaftJ. Al =20 ----------MB_8CD7464A0C207D0_F24_53F0E_webmail-m022.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8"
Tracy,
did you ever find a suitable replacement fuel pressure sender? What= are you using now?
 
Thanks,
Brian Trubee



-----Original Message-----
From: Tracy <tracy@rotaryaviation.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Mon, Dec 27, 2010 4:30 pm
Subject: [FlyRotary] Re: Fuel rail pressure

Just for anoth= er 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 ho= t startups.  This arrangement is now used on most new cars.  Eve= n 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 advantag= e 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 vapo= r 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 <ALVentures@cox.= net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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 confi= g where in a car you are starting it with no load attached to the cranksha= ft.  If the fuel rails are 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. &nb= sp;What is causing this besides poor ventilation?
The pressure in the fuel rail can never exceed the setting= of the pressure regulator; which should bear about 40 psi engine off. Tha= t=E2=80=99s true even if you call the e-shaft a crankshaftJ.
Al
 

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