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Message-ID: <1c23473f050904213063ae5ba3@mail.gmail.com>
Date: Sun, 4 Sep 2005 21:30:21 -0700
From: David Leonard <wdleonard@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Another great flying day = another day of troubleshooting
In-Reply-To: <list-711422@logan.com>
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  Ed Wrote:

 Hi Dave,
>  Thanks for the reports, I don't feel so lonesome {:>).=20
>   Regarding SAG - my analysis is that susceptibility to SAG is=20
> proportional to combustion chamber pressure at ignition and the condition=
 of=20
> the plugs. The more pressure - the harder it is for the spark to jump the=
=20
> gap, so if your plugs are getting coated with lead/carbon, I would expect=
 to=20
> see more SAG with More manifold pressure. Tracy and I have found the same=
=20
> thing (unturboed). At high power setting (higher manifold pressure) the=
=20
> problem becomes more aggravated. Reducing throttle setting helped - but,=
=20
> replacing (perhaps cleaning the spark plug center ceramic cone) is the cu=
re.=20
> I must have a fortune in little-used spark plugs setting around waiting f=
or=20
> me to have nothing else to do but clean spark plugs {:>).
>=20
 Ok, that fits except for the fact that at increasing altitudes, the MAP at=
=20
which the SAG occurred was lower (eg. 36" at s.l. but only 26" at 10k'). So=
=20
something else is involved but I don't know what. Time to order more spark=
=20
plugs. :-)

  I only use STEEL for my alternator arm - too much vibration there for=20
> aluminum (my opinion of course, but having had aluminum brake line fail -=
=20
> I'm a little leery of the stuff {:>)).
> =20
 Yes, mine was steel too. But it was a soft/cheap hardware variety steel.=
=20
Time to get some good stuff.

 Thanks for the comments.

--=20
Dave Leonard
Turbo Rotary RV-6 N4VY
http://members.aol.com/_ht_a/rotaryroster/index.html
http://members.aol.com/_ht_a/vp4skydoc/index.html

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<br><br>
<div>&nbsp;</div>
<p>&nbsp;</p>
<p>Ed Wrote:</p>
<div><br>&nbsp;</div>
<blockquote class=3D"gmail_quote" style=3D"PADDING-LEFT: 1ex; MARGIN: 0px 0=
px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div><font face=3D"Arial">Hi Dave,</font></div>
<div><font face=3D"Arial"></font>&nbsp;</div>
<div><font face=3D"Arial">Thanks for the reports, I don't feel so lonesome =
{:&gt;).&nbsp;</font></div>
<div><font face=3D"Arial"></font>&nbsp;</div>
<div><font face=3D"Arial">&nbsp;Regarding SAG - my analysis is that suscept=
ibility to SAG is proportional to combustion chamber pressure at ignition a=
nd the condition of the plugs.&nbsp; The more pressure -&nbsp;the harder it=
 is for the spark to jump the gap, so if your plugs are getting coated with=
 lead/carbon, I would expect to see more SAG with More manifold pressure.&n=
bsp; Tracy and I have found the same thing (unturboed).&nbsp; At high power=
 setting (higher manifold pressure) the problem becomes more aggravated.&nb=
sp; Reducing throttle setting helped - but, replacing (perhaps cleaning the=
 spark plug center ceramic cone) is the cure.&nbsp; I must have a fortune i=
n little-used spark plugs setting around waiting for me to have nothing els=
e to do but clean spark plugs {:&gt;).
</font></div></blockquote>
<div>&nbsp;</div>
<div>Ok, that fits except for the fact that at increasing altitudes, the MA=
P at which the SAG occurred was lower (eg. 36&quot; at s.l. but only 26&quo=
t; at 10k').&nbsp;&nbsp; So something else is involved but I don't know wha=
t.&nbsp; Time to order more spark plugs.&nbsp; :-)
</div><br>
<blockquote class=3D"gmail_quote" style=3D"PADDING-LEFT: 1ex; MARGIN: 0px 0=
px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div>&nbsp;</div>
<div><font face=3D"Arial">I only use STEEL for my alternator arm - too much=
 vibration there for aluminum (my opinion of course, but having had aluminu=
m brake line fail - I'm a little leery of the stuff {:&gt;)).</font></div>

<div><font face=3D"Arial"></font>&nbsp;</div></blockquote>
<div>&nbsp;</div>
<div>Yes, mine was steel too.&nbsp; But it was a soft/cheap hardware variet=
y steel.&nbsp; Time to get some good stuff.</div>
<p>&nbsp;</p>
<p>Thanks for the comments.<br clear=3D"all"><br>-- <br>Dave Leonard<br>Tur=
bo Rotary RV-6 N4VY<br><a href=3D"http://members.aol.com/_ht_a/rotaryroster=
/index.html">http://members.aol.com/_ht_a/rotaryroster/index.html</a><br><a=
 href=3D"http://members.aol.com/_ht_a/vp4skydoc/index.html">
http://members.aol.com/_ht_a/vp4skydoc/index.html</a> </p>

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