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References: <list-5742307@logan.com>
Date: Mon, 3 Sep 2012 21:02:05 -0700
Message-ID: <CAN=mtac2wf4faPk22OVao_GBwLwqfNTi99cEhaavUJvTjtmpNw@mail.gmail.com>
Subject: Re: [FlyRotary] Intermittent hiccup
From: William Jepson <wrjjrs@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Bill, there are 2 possibilities. First you will hear from many people that
you should never sandblast plugs. The reason is that the porcelain is
pitted and the glaze on the plug is broken and then the plugs can embed
carbon. The plugs can then track carbon and the spark will travel down the
carbon track. On fine center wire plugs blasting can round the electrode
which increases the voltage needed to fire the plug. Both conditions are
bad, tracking is the worst. Pull your plugs and look for what appears to be
a pencil line down the insulator. That is tracking. It likes to hide in the
area near or under the sidewire which doesn't clean up as well when the
blasted.
Bill Jepson
On Sep 3, 2012 8:47 PM, "Bill Bradburry" <bbradburry@bellsouth.net> wrote:

>   Has anyone ever noticed a hiccup associated with sparkplug SAG?  I have
> a hiccup that is occurring at random intervals from seconds to several
> minutes.  Sometimes it is pretty mild and sometimes it shakes the plane! =
 I
> also seem to be down in power and I am beginning to suspect plug SAG.  I
> have 38 hours with the Iridium plugs plus a lot of time over the years of
> running the engine before flight.  I had a couple instances of flooding
> which required that I take the plugs out and sandblast them to get them t=
o
> fire.  Just drying them out didn=92t work.****
>
> ** **
>
> Thoughts??****
>
> ** **
>
> Bill B****
>

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<p>Bill, there are 2 possibilities. First you will hear from many people th=
at you should never sandblast plugs. The reason is that the porcelain is pi=
tted and the glaze on the plug is broken and then the plugs can embed carbo=
n. The plugs can then track carbon and the spark will travel down the carbo=
n track. On fine center wire plugs blasting can round the electrode which i=
ncreases the voltage needed to fire the plug. Both conditions are bad, trac=
king is the worst. Pull your plugs and look for what appears to be a pencil=
 line down the insulator. That is tracking. It likes to hide in the area ne=
ar or under the sidewire which doesn&#39;t clean up as well when the blaste=
d.<br>

Bill Jepson </p>
<div class=3D"gmail_quote">On Sep 3, 2012 8:47 PM, &quot;Bill Bradburry&quo=
t; &lt;<a href=3D"mailto:bbradburry@bellsouth.net">bbradburry@bellsouth.net=
</a>&gt; wrote:<br type=3D"attribution"><blockquote class=3D"gmail_quote" s=
tyle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">









<div lang=3D"EN-US" link=3D"blue" vlink=3D"blue">

<div>

<div>

<p class=3D"MsoNormal"><font color=3D"navy" face=3D"Arial"><span style=3D"f=
ont-size:10.0pt;font-family:Arial;color:navy">Has anyone ever noticed a hic=
cup
associated with sparkplug SAG?=A0 I have a hiccup that is occurring at
random intervals from seconds to several minutes.=A0 Sometimes it is pretty
mild and sometimes it shakes the plane!=A0 I also seem to be down in power
and I am beginning to suspect plug SAG.=A0 I have 38 hours with the Iridium
plugs plus a lot of time over the years of running the engine before
flight.=A0 I had a couple instances of flooding which required that I take
the plugs out and sandblast them to get them to fire.=A0 Just drying them
out didn=92t work.<u></u><u></u></span></font></p>

<p class=3D"MsoNormal"><font color=3D"navy" face=3D"Arial"><span style=3D"f=
ont-size:10.0pt;font-family:Arial;color:navy"><u></u>=A0<u></u></span></fon=
t></p>

<p class=3D"MsoNormal"><font color=3D"navy" face=3D"Arial"><span style=3D"f=
ont-size:10.0pt;font-family:Arial;color:navy">Thoughts??<u></u><u></u></spa=
n></font></p>

<p class=3D"MsoNormal"><font color=3D"navy" face=3D"Arial"><span style=3D"f=
ont-size:10.0pt;font-family:Arial;color:navy"><u></u>=A0<u></u></span></fon=
t></p>

<p class=3D"MsoNormal"><font color=3D"navy" face=3D"Arial"><span style=3D"f=
ont-size:10.0pt;font-family:Arial;color:navy">Bill B<u></u><u></u></span></=
font></p>

</div>

</div>

</div>


</blockquote></div>

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