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Date: Mon, 25 Jun 2012 14:01:43 -0400
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Subject: Re: 360 no longer surging
From: Berni Breen <bbreen@cableone.net>
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My IO360 powered Lancair 360 would run very roughly on taxi following a
flight or a restart prior to the engine having time to cool down.  As we
have moved into the hotter time of the year the issue had become
increasingly worse.  All of my fuel lines are double insulated as an
attempt to keep them from being exposed to heat.  My gascolator is also
insulated.  When I described this condition on LML I received many
responses with the lion share suggesting that I try to provide some cooling
to my engine driven fuel pump and gascolator.  One post suggested I order a
cooling shroud for my engine driven pump from Spruce.  I installed the pump
shroud, punched a 1" hole in the rear pilot side metal baffling, installed
a 1" flange and ran 1" scat to the shroud.  That simple change proved to
eliminate my engine surge.

Clearly the fuel in the engine driven pump was getting hot and vaporizing
introducing air into the system.  By providing some cool air to the pump
the temperature was reduced enough to eliminate that vaporization.

I hope this helps.

Berni

On Monday, June 25, 2012, Christian Meier wrote:

> Berni,
> Could you please describe what you changed to cure your engine problems.
> thank you,
> Christian
>
>
> Am 21.06.2012 um 19:07 schrieb Berni Breen:
>
> > Last week I received the fuel pump cooling shroud I had ordered from
> Aircraft Spruce following a recommendation from a fellow LMLer.  Following
> installation and testing I can confirm that this simple, inexpensive change
> completely eliminated my engine surge issues.  I want to sincerely thank
> all those that responded to my call for help as once again I was able to
> fix a problem as a direct result of input from this list.
>
>
> --
> For archives and unsub
> http://mail.lancaironline.net:81/lists/lml/List.html
>

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My IO360 powered Lancair 360 would run very roughly on taxi following a fli=
ght or a restart prior to the engine having time to cool down. =A0As we hav=
e moved into the hotter time of the year the issue had become increasingly =
worse. =A0All of my fuel lines are double insulated as an attempt to keep t=
hem from being exposed to heat. =A0My gascolator is also insulated. =A0When=
 I described this condition on LML I received many responses with the lion =
share suggesting that I try to provide some cooling to my engine driven fue=
l pump and gascolator. =A0One post suggested I order a cooling shroud for m=
y engine driven pump from Spruce. =A0I installed the pump shroud, punched a=
 1&quot; hole in the rear pilot side metal baffling, installed a 1&quot; fl=
ange and ran 1&quot; scat to the shroud. =A0That simple change proved to el=
iminate my engine surge.<div>
<br></div><div>Clearly the fuel in the engine driven pump was getting hot a=
nd vaporizing introducing air into the system. =A0By providing some cool ai=
r to the pump the temperature was reduced enough to eliminate that vaporiza=
tion.</div>
<div><br></div><div>I hope this helps.</div><div><br></div><div>Berni<span>=
</span><br><br>On Monday, June 25, 2012, Christian Meier  wrote:<br><blockq=
uote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc =
solid;padding-left:1ex">
Berni,<br>
Could you please describe what you changed to cure your engine problems.<br=
>
thank you,<br>
Christian<br>
<br>
<br>
Am 21.06.2012 um 19:07 schrieb Berni Breen:<br>
<br>
&gt; Last week I received the fuel pump cooling shroud I had ordered from A=
ircraft Spruce following a recommendation from a fellow LMLer. =A0Following=
 installation and testing I can confirm that this simple, inexpensive chang=
e completely eliminated my engine surge issues. =A0I want to sincerely than=
k all those that responded to my call for help as once again I was able to =
fix a problem as a direct result of input from this list.<br>

<br>
<br>
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</blockquote></div>

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