X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 24 Aug 2010 14:07:40 -0400 Message-ID: X-Original-Return-Path: Received: from qmta04.emeryville.ca.mail.comcast.net ([76.96.30.40] verified) by logan.com (CommuniGate Pro SMTP 5.3.8) with ESMTP id 4442008 for lml@lancaironline.net; Tue, 24 Aug 2010 11:59:13 -0400 Received-SPF: pass receiver=logan.com; client-ip=76.96.30.40; envelope-from=olsen25@comcast.net Received: from omta10.emeryville.ca.mail.comcast.net ([76.96.30.28]) by qmta04.emeryville.ca.mail.comcast.net with comcast id yDpH1e0030cQ2SLA4Fyftf; Tue, 24 Aug 2010 15:58:39 +0000 Received: from SibranPC ([98.245.158.191]) by omta10.emeryville.ca.mail.comcast.net with comcast id yFye1e00D483eG28WFye16; Tue, 24 Aug 2010 15:58:39 +0000 From: "Dan & Kari Olsen" X-Original-To: Subject: Vapor lock X-Original-Date: Tue, 24 Aug 2010 09:58:37 -0600 X-Original-Message-ID: <00c501cb43a5$373adb20$a5b09160$@comcast.net> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00C6_01CB4372.ECA28E00" X-Mailer: Microsoft Outlook 14.0 Thread-Index: ActDo9Rp/TMsE8kGTFmvCuWEHrnSTQ== Content-Language: en-us This is a multipart message in MIME format. ------=_NextPart_000_00C6_01CB4372.ECA28E00 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Greetings, =20 During the first year of flying my IO-320 I had exactly the same = problem. My setup included a Dukes electric boost pump located on the lower-right side of the firewall and the stock RSA fuel injection system. It would = get hot, fuel vaporized and then just spin in air (which is very hard on a = Dukes pump). Hot starts were a real bugger! =20 When Orin Riddell came out to do my first flight he took one look at the setup and told me I should relocate the Dukes pump to the floor under = the passenger=92s seat because I=92d have hot start problems. I dragged my = feet but after one summer I made the change. =20 Now, the pump lays on its side under the passenger=92s 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 never gets even a bubble of = air. With this cool fuel and continuous prime, the pump *pushes* the fuel = through the rest of the system rather than trying to suck fuel through the vapor bubbles. =20 My hot start technique now is as follows: 1. Leave mixture at lean cutoff 2. Throttle about =BC of the way open 3. Crank engine 4. Once the prop has made about 3 or 4 revolutions smoothly and quickly push in the mixture (engine will fire and the begin to cough and stumble) 5. Very quickly turn on the electric 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. Boost off once the engine is running smoothly 7. Make sure to do a good run-up before takeoff to ensure all = vapor is purged from the lines. =20 I hope this works for those of you with the hot start issues on the = IO-320 and IO-360 engines. =20 Cheers! =20 Dan Olsen N320DK =96 500hrs Fort Collins, CO ------=_NextPart_000_00C6_01CB4372.ECA28E00 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Greetings,

 

During the = first year of flying my IO-320 I had exactly the same problem.=A0 My = setup included a Dukes electric boost pump located on the lower-right = side of the firewall and the stock RSA fuel injection system.=A0 It = would get hot, fuel vaporized and then just spin in air (which is very = hard on a Dukes pump).=A0 Hot starts were a real = bugger!

 

When Orin Riddell came out to do my first flight he = took one look at the setup and told me I should relocate the Dukes pump = to the floor under the passenger’s seat because I’d have hot = start problems.=A0 I dragged my feet but after one summer I made the = change.

 

Now, the pump lays on its side under the = passenger’s seat which is at about the same level as the bottom of = the fuel tanks.=A0 This way, the pump always is bathed in cool fuel from = the tank and never gets even a bubble of air. With this cool fuel and = continuous prime, the 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.       = Leave mixture at lean cutoff

2.       = Throttle about =BC of the way = open

3.       = Crank engine

4.       = Once the prop has made about 3 or 4 revolutions = smoothly and quickly push in the mixture (engine will fire and the begin = to cough and stumble)

5.       = Very quickly turn on the electric boost and = engine springs to life.=A0 Probably will need boost pump on for about a = minute to purge all the vapor from the system.

6.       = Boost off once the engine is running = smoothly

7.       = Make sure to do a good run-up before takeoff to = ensure all vapor is purged from the lines.

 

I hope this = works for those of you with the hot start issues on the IO-320 and = IO-360 engines.

 

Cheers!

 

Dan = Olsen

N320DK – = 500hrs

Fort Collins, = CO

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