X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 25 Aug 2010 07:51:14 -0400 Message-ID: X-Original-Return-Path: Received: from web57508.mail.re1.yahoo.com ([66.196.100.75] verified) by logan.com (CommuniGate Pro SMTP 5.3.8) with SMTP id 4443021 for lml@lancaironline.net; Wed, 25 Aug 2010 07:12:53 -0400 Received-SPF: none receiver=logan.com; client-ip=66.196.100.75; envelope-from=casey.gary@yahoo.com Received: (qmail 24285 invoked by uid 60001); 25 Aug 2010 11:12:17 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:X-YMail-OSG:Received:X-Mailer:References:Date:From:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=YcNc4HZ7kHrpr2AyZ/YULzNKh3eN1OJj8AnGKZQerp+NGqkiZVACtVeYDAEZl3DIuNi1d3KLNhI5yODnxWjisPPa+OWIkyAugnDa9iaz/6TyurxwqzEZihGL0rskOfzZW5BcwML+B6N5o7v9cL8exwn2wJ1xsO9mkCWJ8UKsojY=; X-Original-Message-ID: <629917.23650.qm@web57508.mail.re1.yahoo.com> X-YMail-OSG: IwMKKXAVM1lwCOJIZ7h6pH5Uo.uS8OTblpvBvXf8Jg83agB yBxzVp7jBW2dR9OHv.sx8VKpMpf8RloWn3d2ODdNPkneeDsbyOz.zHinF2vF DVkXLXRwWn0b7Ik1Uo7sKAbB7q0EttlPMG133OL9lnZ1qfU194gHMRxGdy1d GhqdxHR7uncS6jPWqSn5tJNZ4o.5GAmpqn2SwITAyfUDdlg5_3KgpJsXBEN4 dyBCzXktkkVnhyZxaYtlEM0T126DGw9hE74ZJAdRxnB0- Received: from [97.122.180.44] by web57508.mail.re1.yahoo.com via HTTP; Wed, 25 Aug 2010 04:12:15 PDT X-Mailer: YahooMailRC/470 YahooMailWebService/0.8.105.279950 References: X-Original-Date: Wed, 25 Aug 2010 04:12:15 -0700 (PDT) From: Gary Casey Subject: Re: Vapor lock X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-1319847808-1282734735=:23650" --0-1319847808-1282734735=:23650 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable My experience matches Dan's. My IO-540 powered ES was built with the elect= ric =0Apump flat on the floor under the seat and has never had a problem wi= th prime. =0A The RSA fuel system, in contrast to the Continental, has no f= uel return, so =0Awhatever vapor is in the system has to be purged through = the engine. That makes =0Afor some rough running and potential stalling af= ter a hot start. Yes, there are =0Apurge systems available that will certa= inly help, but I elected to keep mine =0Asimple. I added a tight box aroun= d my gascolator with an air scoop for cooling =0Aand air from there goes to= a shroud around the engine pump. Works well while =0Arunning but a hot so= ak will still cook the fuel in the system. Only problem is =0Athat the rou= gh running and surging right after start makes the passengers =0Anervous.= =0AGary Casey=0AES #157, Colorado=0A=0ANow, the pump lays on its side under= the passenger=E2=80=99s seat which is at about the =0Asame level as the bo= ttom of the fuel tanks. This way, the pump always is bathed =0Ain cool fue= l from the tank and never gets even a bubble of air. With this cool =0Afuel= and continuous prime, the pump *pushes* the fuel through the rest of the = =0Asystem rather than trying to suck fuel through the vapor bubbles.=0A =0A= My hot start technique now is as follows:=0A1. Leave mixture at lean = cutoff=0A2. Throttle about =C2=BC of the way open=0A3. Crank en= gine=0A4. Once the prop has made about 3 or 4 revolutions smoothly an= d quickly =0Apush in the mixture (engine will fire and the begin to cough a= nd stumble)=0A5. Very quickly turn on the electric boost and engine s= prings to life. =0AProbably will need boost pump on for about a minute to = purge all the vapor from =0Athe system.=0A6. Boost off once the engin= e is running smoothly=0A7. Make sure to do a good run-up before takeo= ff to ensure all vapor is =0Apurged from the lines.=0A =0AI hope this works= for those of you with the hot start issues on the IO-320 and =0AIO-360 eng= ines.=0A =0ACheers!=0A =0ADan Olsen=0A=0A=0A --0-1319847808-1282734735=:23650 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
My experience matches= Dan's.  My IO-540 powered ES was built with the electric pump flat on the fl= oor under the seat and has never had a problem with prime.  The RSA fu= el system, in contrast to the Continental, has no fuel return, so whatever = vapor is in the system has to be purged through the engine.  That make= s for some rough running and potential stalling after a hot start.  Ye= s, there are purge systems available that will certainly help, but I electe= d to keep mine simple.  I added a tight box around my gascolator with = an air scoop for cooling and air from there goes to a shroud around the eng= ine pump.  Works well while running but a hot soak will still cook the= fuel in the system.  Only problem is that the rough running and surgi= ng right after start makes the passengers nervous.
Gary Casey
ES #157, Colorado

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Now, the pump lays on its side under the passenger=E2=80= =99s seat which is at about the same level as the bottom of the fuel tanks.=   This way, the pump always is bathed in cool fuel from the tank and n= ever gets even a bubble of air. With this cool fuel and continuous prime, t= he pump *pushes* the fuel through the rest of the system rather than= trying to suck fuel through the vapor bubbles.

 

My hot start= technique now is as follows:

1.   &nb= sp;   Leave mixture at lean cutoff

2.       Thrott= le about =C2=BC of the way open

3.    &nbs= p;  Crank engine

4. &nbs= p;     Once the prop has made about = 3 or 4 revolutions smoothly and quickly push in the mixture (engine will fi= re and the begin to cough and stumble)

5.  =      Very quickly turn on the electr= ic boost and engine springs to life.  Probably will need boost pump on= for about a minute to purge all the vapor from the system.

6.   &= nbsp;   Make sure to do a good run-up before t= akeoff to ensure all vapor is purged from the lines.

 

 

Cheers!

 

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