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High Temperature Silicone

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Dennis Thate

Joined: 18 Nov 2010
Posts: 362

Posted: Tue Apr 12, 2011 12:09 pm Post subject: High Temperature Silicone

I'm looking for a High Temperature Silicone to use on my Rotax exhaust springs. Can someone recommend a product and supplier.



Thanks

_________________
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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Tue Apr 12, 2011 12:29 pm Post subject: High Temperature Silicone

I'm looking for a High Temperature Silicone to use on my Rotax exhaust 

springs. Can someone recommend a product and supplier.





Dennis T/Gang:



I use ordinary silicone seal on my exhaust springs and it works great.  I 

have used permatex copper silicone gasket maker before, but could tell no 

difference from what I am using now on the Titan Exhaust System on my 

912ULS.



john h

mkIII

Titus, Alabama

_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

Dana

Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA

Posted: Tue Apr 12, 2011 2:13 pm Post subject: High Temperature Silicone

At 04:09 PM 4/12/2011, Dennis Thate wrote:



  	  Quote: 	
		  I'm looking for a High Temperature Silicone to use on my Rotax exhaust springs. Can someone recommend a product and supplier. 	


 The orange stuff, made by Loctite or Permatex, available at any auto parts store.



 -Dana

 --

 You're never too old to learn something stupid.

    [quote][b]

byoungplumbing(at)gmail.c
Guest

Posted: Tue Apr 12, 2011 2:23 pm Post subject: High Temperature Silicone

I'm looking for a High Temperature Silicone to use on my Rotax exhaust

springs. Can someone recommend a product and supplier.





Dennis T/Gang:



I use ordinary silicone seal on my exhaust springs and it works great. john 

h



all

i will second this,,,,   as i remember,  you can cure regular silicone at 

400 deg...   and out on the springs there is plenty of cooling down from the 

exhaust gas temps.



i safety wire through the springs then also between center points from 

spring to spring, and pull  the springs slightly out of column.  then add 

the silicone,  this greatly reduces the viberatons.



boyd young  mkiii



do not archive

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Tue Apr 12, 2011 2:36 pm Post subject: High Temperature Silicone

i safety wire through the springs then also between center points from

spring to spring, and pull  the springs slightly out of column.  then add

the silicone,  this greatly reduces the viberatons.



boyd young  mkiii





Boyd Y/Gang:



I used to use safety wire on my two stroke exhaust systems.  Was very time 

consuming.



On the 912 exhaust I don't use wire, but squeeze the silicone seal from hook 

to hook forcing it into the full length of the coil.  Each hook and loop 

gets a good dose to keep any parts that should break from going through the 

prop.



I recently installed SS springs.  They are said to last much longer than the 

standard spring, but cost nearly $5.00 each.



john h

mkIII

Titus, Alabama

_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

zeprep251(at)aol.com
Guest

Posted: Tue Apr 12, 2011 3:12 pm Post subject: High Temperature Silicone

John,

Did you get those springs from JBM?

G.Aman mk3 jabiru 2200a



--

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Tue Apr 12, 2011 3:51 pm Post subject: High Temperature Silicone

Did you get those springs from JBM?

G.Aman mk3 jabiru 2200a



Gary A/Gang:



Sure did.  They are very impressive looking.



john h

mkIII

Titus, Alabama

_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Tue Apr 12, 2011 4:02 pm Post subject: High Temperature Silicone

Did you get those springs from JBM?

G.Aman mk3 jabiru 2200a



Here's their web site:



http://jbmindustries.com/



john h

_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

Richard Pike

Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee

Posted: Tue Apr 12, 2011 5:22 pm Post subject: Re: High Temperature Silicone

 	  Dennis Thate wrote: 	
		  I'm looking for a High Temperature Silicone to use on my Rotax exhaust springs. Can someone recommend a product and supplier.



Thanks 	




Spend a half a day modifying your exhaust and never worry about springs again. Buy some exhaust pipe clamps and cut off the ends where the bolts go through and weld those pieces to your exhaust. Pick up some 5/16" bolts at Lowes and drill holes in them for cotter pins. Get 4 stiff springs that will fit over the bolts and forget about silicone.



Once every 2 or 3 years buy new bolts because the old ones will chafe and wear grooves in them, but they will still be 1/4"  thick. Even grade 3 steel 1/4" in diameter is a lot more reliable than brand new Rotax springs. Been doing this for years now, have almost $15 invested in it. Bullet proof. WooHoo!



Richard Pike

MKIII N420P (420ldPoops)

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pj.ladd(at)btinternet.com
Guest

Posted: Wed Apr 13, 2011 3:02 am Post subject: High Temperature Silicone

I'm looking for a High Temperature Silicone to use on my Rotax exhaust 

springs>>



Hi Dennis,

I am intrigued by this. What is the silicone supposed to do?. As far as I am 

aware the springs do nothing but hold the two sections of the exhaust 

tightly together at the ball joint.

When I was running a 503 i had the springs on, wired of course to stop them 

falling through the prop. When they got rusty I painted them with black 

Radiator paint or whatever  heat resistant paint I had about, or replaced 

them. They are so cheap it was hardly worth the bother.

What else do they do that makes it worthwhile taking extra trouble?

Intrigued



Pat

Dana

Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA

Posted: Wed Apr 13, 2011 3:25 am Post subject: High Temperature Silicone

Pat, the silicone damps the vibration.  Without it, the springs vibrate all the time, resulting in much shorter life due to metal fatigue and wear at the ends.



 -Dana



 At 06:59 AM 4/13/2011, Pat Ladd wrote:

  	  Quote: 	
		  --> Kolb-List message posted by: "Pat Ladd" <pj.ladd(at)btinternet.com>



 I'm looking for a High Temperature Silicone to use on my Rotax exhaust springs>>



 Hi Dennis,

 I am intrigued by this. What is the silicone supposed to do?. As far as I am aware the springs do nothing but hold the two sections of the exhaust tightly together at the ball joint.

 When I was running a 503 i had the springs on, wired of course to stop them falling through the prop. When they got rusty I painted them with black Radiator paint or whatever  heat resistant paint I had about, or replaced them. They are so cheap it was hardly worth the bother.

 What else do they do that makes it worthwhile taking extra trouble? 	


 --

 Smallpox has been largely destroyed - should the virus be given endanged species status?   

    [quote][b]

pj.ladd(at)btinternet.com
Guest

Posted: Wed Apr 13, 2011 5:34 am Post subject: High Temperature Silicone

the silicone damps the vibration>>

  

 hi . thanks for the info.  I dont know what  quantity of of the silicone you have to buy  but for the cost of replacing  the springs every couple of years I wouldn`t have thought it was worth  while.

  

 Cheers

  

 Pat

   [quote][b]

Roger Lee

Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.

Posted: Wed Apr 13, 2011 5:57 am Post subject: Re: High Temperature Silicone

You can use, and many do, the Permatex Copper or Black silicone. They are rated for 600F-700F which is more than enough. You can buy these at most hardware or automotive stores. There are two ways to apply this and it strictly depends on you. 

One is to lay a bead 1/2" wide and a 1/4" tall down each spring and work it into the coils. If you don't apply a big enough bead and it is thin and narrow it will not function properly because it has no body and strength. The second accepted method is to actually fill the spring with the silicone. I prefer the beed. This in fact does help with the pulsation coming from the exhaust system which causes premature spring failure and excessive wear on the springs where it loops connects over the loop. The silicone is not a replacement for safety wiring the springs, but in addition to.



This is in the Rotax manual, there was an SB out on it many years ago and should be a standard practice with trained Rotax mechanics. This subject is usually discussed in the Service or Line maint Rotax class

_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Wed Apr 13, 2011 11:47 am Post subject: High Temperature Silicone

The silicone is not a replacement for safety wiring the springs, but in 

addition to.



 --------

Roger Lee



Roger L/Gang:



Not to be argumentive, but I haven't used safety wire on exhaust springs in 

many years.  The silicone seal (ordinary/normal) works great and captures 

hooks and coils should they break, preventing them from going through the 

prop on our pusher Kolbs.  Springs are heat treated and very hard.  They 

will put a ding in a warp drive prop that will have to be repaired.



If the hooks/loops and coils are sealed up with silicone seal, the broken 

parts will stay in place and not through your prop.



john h

mkIII

Titus, Alabama

_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

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