X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 22 May 2012 15:27:28 -0400 Message-ID: X-Original-Return-Path: Received: from mail-yx0-f180.google.com ([209.85.213.180] verified) by logan.com (CommuniGate Pro SMTP 5.4.5) with ESMTPS id 5553620 for lml@lancaironline.net; Tue, 22 May 2012 11:43:18 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.213.180; envelope-from=bbreen@cableone.net Received: by yenq6 with SMTP id q6so5471545yen.25 for ; Tue, 22 May 2012 08:42:41 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=subject:references:from:content-type:x-mailer:in-reply-to :message-id:date:to:content-transfer-encoding:mime-version :x-gm-message-state; bh=BPYHU7Vtg/m0Ur9hsLqACGbNY5NyHZhw4cJ9Jmijs5I=; b=kvy5jZu3icxY+jI1oLbuXF01FKGgkLs2Ui0MHIOvJM2ICLMS3iRC6ZVXn46k6b//Pw ibD85v7Bg942lWRSx5ibM6vCNHPXK/AVns31lHbUw3s0e84SSxdKY78PiceKIctYghW4 fWAskzJmWu0VO9aodZndbHGMTt2MvF42Oyamd1CsqMqMaxrYgW7DMvYPjht3iYebSn1D sJmIXpKHBd//x3a0d2RieQKr23ejyw1ByaK6R8y8yHMrKoCNcrsOim3649BQyS/OFee8 OGgCxCeFK3jMLmUQnT/MiV6OBUkI0IO/Ugtx9KlbBQs1VaVXGvnjGv37fRTkteSMloGR UR5Q== Received: by 10.236.76.5 with SMTP id a5mr28433770yhe.8.1337701361671; Tue, 22 May 2012 08:42:41 -0700 (PDT) X-Original-Return-Path: Received: from [10.164.19.175] (mobile-166-147-113-188.mycingular.net. [166.147.113.188]) by mx.google.com with ESMTPS id c12sm38344707ann.15.2012.05.22.08.42.36 (version=TLSv1/SSLv3 cipher=OTHER); Tue, 22 May 2012 08:42:40 -0700 (PDT) Subject: Re: [LML] Re: 360 still surging References: From: Berni Breen Content-Type: multipart/alternative; boundary=Apple-Mail-A9630EEF-F42C-4C80-9482-444EA52C6384 X-Mailer: iPhone Mail (9B206) In-Reply-To: X-Original-Message-Id: <877F67BC-DC20-4144-A662-18364026ADE6@cableone.net> X-Original-Date: Tue, 22 May 2012 10:42:30 -0500 X-Original-To: Lancair Mailing List Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) X-Gm-Message-State: ALoCoQlWJWs55I/Zb+OwzaGNMGD4hJgQaUXr+5KYmueEfh38or4D/ZaEbBdptNG6f2bPo6hL0EQq --Apple-Mail-A9630EEF-F42C-4C80-9482-444EA52C6384 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Hey Mark: The spider was not overhauled with the servo but I will take your advice and= check the spring force. CHTs and oil temp are no problem when engine is surging. Ambient temperatur= e does not change the problem. Thanks for your response. Berni Breen Sent from my iPhone On May 22, 2012, at 8:32 AM, "Mark Ravinski" wrote: > Berni, > The fuel distribution spider has a shutoff valve built in to positively sh= ut down the flow when the fuel pressure drops far enough. > (as during shutdown). Was the spider overhauled with the servo? Maybe ta= ke a look at that valve to check that it has enough spring force and is not s= ticking at high temps. > What do you see for CHT's and oil temp when you are having this surging? > Does ambient temperature change the problem? > =20 > On normally aspirated engines, surging is most commonly caused by inductio= n air leaks. > =20 > Good luck, > =20 > Mark Ravinski > IO360 1530 hrs. >=20 > From: Berni Breen > Sent: Monday, May 21, 2012 4:30 PM > To: lml@lancaironline.net > Subject: [LML] 360 still surging >=20 > Many of you guys have offered suggestions to help me remedy my ongoing eng= ine surge challenge. As a reminder...my fuel injected IO360 displays a very= pronounced surge during idle and taxi following a flight and brief shutdown= /restart. The problem never occurs when the engine iis cool. =20 >=20 > =20 --Apple-Mail-A9630EEF-F42C-4C80-9482-444EA52C6384 Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=utf-8
Hey Mark:

The spider was not overhauled with the servo but I will take your advice and check the spring force.

CHTs and oil temp are no problem when engine is surging.  Ambient temperature does not change the problem.

Thanks for your response.

Berni Breen
Sent from my iPhone

On May 22, 2012, at 8:32 AM, "Mark  Ravinski" <mjrav@comcast.net> wrote:

Berni,
The fuel distribution spider has a shutoff valve built in to positively shut down the flow when the fuel pressure drops far enough.
(as during shutdown).  Was the spider overhauled with the servo?  Maybe take a look at that valve to check that it has enough spring force and is not sticking at high temps.
What do you see for CHT's and oil temp  when you are having this surging?
Does ambient temperature change the problem?
 
On normally aspirated engines, surging is most commonly caused by induction air leaks.
 
Good luck,
 
Mark Ravinski
IO360  1530 hrs.

Sent: Monday, May 21, 2012 4:30 PM
Subject: [LML] 360 still surging

Many of you guys have offered suggestions to help me remedy my ongoing engine surge challenge.  As a reminder...my fuel injected IO360 displays a very pronounced surge during idle and taxi following a flight and brief shutdown/restart.  The problem never occurs when the engine iis cool.  

 
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