Return-Path: Received: from imo-d21.mx.aol.com ([205.188.144.207] verified) by logan.com (CommuniGate Pro SMTP 4.2.9) with ESMTP id 710885 for flyrotary@lancaironline.net; Mon, 07 Feb 2005 03:53:11 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.144.207; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-d21.mx.aol.com (mail_out_v37_r3.8.) id q.15.3decad04 (24895) for ; Mon, 7 Feb 2005 03:51:36 -0500 (EST) From: WRJJRS@aol.com Message-ID: <15.3decad04.2f388618@aol.com> Date: Mon, 7 Feb 2005 03:51:36 EST Subject: Re: [FlyRotary] Heating the Fuel To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_15.3decad04.2f388618_boundary" X-Mailer: 8.0 for Windows sub 6036 --part1_15.3decad04.2f388618_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 2/6/2005 9:47:48 PM Pacific Standard Time, daveleonard@cox.net writes: > It will probably expand in the tank but I don't expect that will occur > faster than it is used up. I have no guess as to what temp will become steady > state for the fuel pumped out of the tank. My guess is that it will not be > much warmer than normal, but a slight increase in temp may help with > vaporization Dave, I think you should pass on this one. The problem of vapor lock is a very real possibility. Another problem is how your tanks are plumbed. Lots of people is one-way valves air in with a check ball to prevent fuel from flowing out. If you are plumbed that way you could pressureize your tanks. I don't think liquid expansion would be a problem. The problem would be high vapor pressure in the tank. If a lot of vapor is caused by higher temperature fuel the tank might burst or leak, or at least deform. I have seen this happen on an endurance racing motorcycle with the check valve set-up. The tank had one of those trick dry-break quick-fill systems where you can load 5 gallons of fuel in seconds. The system also had the check valve I described above. The bike came in for a standard stop, was filled and then a bad wreck caused the race to be stopped for a while. The tank ws heated by the engine heat while full and deformed and caused several pinhole leaks at the welds, it was ugly. While the idea itself has merit I don't think the risk is worth it. Bill Jepson --part1_15.3decad04.2f388618_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable In a message dated 2/6/2005 9:47:48= PM Pacific Standard Time, daveleonard@cox.net writes:

It will probably expand in the= tank but I don't expect that will occur faster than it is used up.  I=20= have no guess as to what temp will become steady state for the fuel pumped o= ut of the tank.  My guess is that it will not be much warmer than norma= l, but a slight increase in temp may help with vaporization

Dave,
I think you should pass on this one. The problem of vapor lock is a very re= al possibility. Another problem is how your tanks are plumbed. Lots of peopl= e is one-way valves air in with a check ball to prevent fuel from flowing ou= t. If you are plumbed that way you could pressureize your tanks. I don't thi= nk liquid expansion would be a problem. The problem would be high vapor pres= sure in the tank. If a lot of vapor is caused by higher temperature fuel the= tank might burst or leak, or at least deform. I have seen this happen on an= endurance racing motorcycle with the check valve set-up. The tank had one o= f those trick dry-break quick-fill systems where you can load 5 gallons of f= uel in seconds. The system also had the check valve I described above. The b= ike came in for a standard stop, was filled and then a bad wreck caused the=20= race to be stopped for a while. The tank ws heated by the engine heat while=20= full and deformed and caused several pinhole leaks at the welds, it was ugly= . While the idea itself has merit I don't think the risk is worth it.
Bill Jepson --part1_15.3decad04.2f388618_boundary--