From: " Lehanover@aol.com" <flyrotary@lancaironline.net>
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Full-name: Lehanover
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Date: Wed, 27 Sep 2017 12:42:28 -0400
Subject: Re: [FlyRotary] Re: spark plug SAG: would this help?
To: flyrotary@lancaironline.net
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So long as the thermal paste is kept off of the electrode area. The paste  
is electrically conductive as well. 
None on the plug body. Once you have it inside a wire sleeve, you cannot  
clean it out. Throw that wire away and start over. 
Reduce the torque on the plug by about 10% as the paste is a great  
lubricant. 
 
Autolite Racing plugs are about $10.00 for 4 plugs. Heat range about the  
same as an NGK 10.  The gap is difficult to change as the ground electrode  
is cut back to expose the end of the center electrode.
Autolite number AR 2592.  Most parts stores can have these for  you 
overnight. 
 
The point of colder heat range plugs is that the car duty cycle is quite  
low, or less than 30%, while the aircraft may be close to 100%. You seldom 
jump  into an RX-7 and drive for an hour at full throttle, but you can do that 
in a  rotary powered airplane. Even race cars can have lower duty cycles 
than  airplanes. 
Rotaries fire the plugs every revolution of the crank, like a 2 stoke.  
Overheated plugs cause lateral cracks to appear through the plug holes in the  
chrome.
 
I found a set of Champion N-57G. Gold Pladium fine wire center electrode.  
We ran these years ago. No longer available. Came out of the box gapped at  
.012" . 
 
One advantage of the NGKs is the long body. Great if you run a killer  
ignition system. Less chance of a stray lightning bolt close to the plugs. CD  
and CD multi spark systems put out lethal voltages.
 
Lynn E. Hanover  
 
 
In a message dated 9/27/2017 11:42:16 A.M. Eastern Daylight Time,  
flyrotary@lancaironline.net writes:

Charlie,  this subject has been brought up before but if anyone is going to 
answer it  you might have to wait 1-2 years for anything definitive on SAG. 
 I  suppose a temperature probe around a spark plug before/after would 
determine  if better heat transfer occurs. I personally use copper-coat on my 
spark plugs  as an anti-seize compound.
Jeff


OK, I really can't remember if  I've brought this up. I've thought about 
posting it, but I couldn't find any  record of doing it. Forgive me if I'm 
repeating myself.

On the subject  of spark plug SAG, and the great research Steve Boese did 
several years ago,  it seemed that extreme temps in the plug itself was what 
is causing the quick  degradation of the plugs. There was talk about running 
colder plugs, and IIRC,  Lynn mentioned high-dollar racing plugs as a 
potential solution.

As  I've begun my research into operating a Rotax 503 2stroke, I discovered 
that  Rotax recommends using heat sink thermal-transfer paste on the spark 
plug  threads of Rotax engines, to improve heat transfer out of the plugs. 
They even  quote a temperature drop number for paste use.

If it works for a  Rotax,  I've been wondering if it would help with the 
rotary, running the  coldest off-the-shelf (affordable) plugs.

Any thoughts? Anyone care to  try it? If you need a little to experiment 
with, I've got a couple of  lifetimes supply from one of my previous lives, & 
could send you a  bit.

Charlie

--
Homepage:   http://www.flyrotary.com/
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<DIV>So long as the thermal paste is kept off of the electrode area. The=
 paste=20
is electrically conductive as well. </DIV>
<DIV>None on the plug body. Once you have it inside a wire sleeve, you can=
not=20
clean it out. Throw that wire away and start over. </DIV>
<DIV>Reduce the torque on the plug by about 10% as the paste is a great=20
lubricant. </DIV>
<DIV>&nbsp;</DIV>
<DIV>Autolite Racing plugs are about $10.00 for 4 plugs. Heat range about=
 the=20
same as an NGK 10.&nbsp; The gap is difficult to change as the ground elec=
trode=20
is cut back to expose the end of the center electrode.</DIV>
<DIV>Autolite number AR 2592.&nbsp; Most parts&nbsp;stores can have these=
 for=20
you overnight. </DIV>
<DIV>&nbsp;</DIV>
<DIV>The point of colder heat range plugs is that the car duty cycle is qu=
ite=20
low, or less than 30%, while the aircraft may be close to 100%. You seldom=
 jump=20
into an RX-7 and drive for an hour at full throttle, but you can do that=
 in a=20
rotary powered airplane. Even race cars can have lower duty cycles than=20
airplanes.&nbsp;</DIV>
<DIV>Rotaries fire the plugs every revolution of the crank, like a 2 stoke=
.=20
Overheated plugs cause lateral cracks to appear through the plug holes in=
 the=20
chrome.</DIV>
<DIV>&nbsp;</DIV>
<DIV>I found a set of Champion N-57G. Gold Pladium fine wire center electr=
ode.=20
We ran these years ago. No longer&nbsp;available. Came out of the box gapp=
ed at=20
.012" . </DIV>
<DIV>&nbsp;</DIV>
<DIV>One advantage of the NGKs is the long body. Great if you run a killer=
=20
ignition system. Less chance of a stray lightning bolt close to the plugs.=
 CD=20
and CD multi spark systems put out lethal&nbsp;voltages.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Lynn E. Hanover&nbsp;&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>
<DIV>In a message dated 9/27/2017 11:42:16 A.M. Eastern Daylight Time,=20
flyrotary@lancaironline.net writes:</DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT=20
  style=3D"BACKGROUND-COLOR: transparent" color=3D#000000 size=3D2 face=3D=
Arial>Charlie,=20
  this subject has been brought up before but if anyone is going to answer=
 it=20
  you might have to wait 1-2 years for anything definitive on SAG.&nbsp;=
 I=20
  suppose a temperature probe around a spark plug before/after would deter=
mine=20
  if better heat transfer occurs. I personally use copper-coat on my spark=
 plugs=20
  as an anti-seize compound.<BR>Jeff<BR><BR><BR>OK, I really can't remembe=
r if=20
  I've brought this up. I've thought about posting it, but I couldn't find=
 any=20
  record of doing it. Forgive me if I'm repeating myself.<BR><BR>On the su=
bject=20
  of spark plug SAG, and the great research Steve Boese did several years=
 ago,=20
  it seemed that extreme temps in the plug itself was what is causing the=
 quick=20
  degradation of the plugs. There was talk about running colder plugs, and=
 IIRC,=20
  Lynn mentioned high-dollar racing plugs as a potential solution.<BR><BR>=
As=20
  I've begun my research into operating a Rotax 503 2stroke, I discovered=
 that=20
  Rotax recommends using heat sink thermal-transfer paste on the spark plu=
g=20
  threads of Rotax engines, to improve heat transfer out of the plugs. The=
y even=20
  quote a temperature drop number for paste use.<BR><BR>If it works for a=
=20
  Rotax,&nbsp; I've been wondering if it would help with the rotary, runni=
ng the=20
  coldest off-the-shelf (affordable) plugs.<BR><BR>Any thoughts? Anyone ca=
re to=20
  try it? If you need a little to experiment with, I've got a couple of=20
  lifetimes supply from one of my previous lives, &amp; could send you a=
=20
  bit.<BR><BR>Charlie<BR><BR>--<BR>Homepage:&nbsp;=20
  http://www.flyrotary.com/<BR>Archive and UnSub:&nbsp;&nbsp;=20
  http://mail.lancaironline.net:81/lists/flyrotary/List.html</FONT></BLOCK=
QUOTE></DIV></FONT></BODY></HTML>
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