Teflon encapsulated silicone O-rings
#3
Warming the planet.
Here' some reading for you..........
http://www.nopistons.com/forums/inde...howtopic=67208
I do have them in my car, about 15K, lots of track time and so far no problem. Pineapple's Orings are viton I believe.
Paul
http://www.nopistons.com/forums/inde...howtopic=67208
I do have them in my car, about 15K, lots of track time and so far no problem. Pineapple's Orings are viton I believe.
Paul
#4
Original Gangster/Rotary!
iTrader: (213)
The pineapple rings are indeed viton (not TES) and I've used them in many of my recent builds.
http://www.pineappleracing.com/index...PROD&ProdID=99
#5
Junior Member
Join Date: Sep 2007
Location: Los Angeles, California
Posts: 47
Likes: 0
Received 0 Likes
on
0 Posts
Trending Topics
#10
Rotary Enthusiast
iTrader: (1)
Join Date: Jul 2004
Location: Rocket City, Alabama
Posts: 1,035
Likes: 0
Received 2 Likes
on
2 Posts
In the rocket business, we use the teflon encapsulated Viton only in certain situations. In most situations, a standard elastomer like Viton or Chemraz or EP works best. Teflon is a polymer, and polymers are usually too hard to seal as well as a soft elastomer. Polymers are also worse about taking a set over time, and loosing their sealing ability compared to an elastomer.
1) Chemical compatibility - the chemical we are sealing is so reactive that straight Viton alone will get soft or swell when exposed to the chemical we are sealing.
2) Low sliding friction - if we have a rotating mechanism and we are trying to use the smallest possible power to turn it, then we use the teflon encapsulated elastomer o-rings.
Again, these are the ONLY two times that we use a Teflon encapsulated viton o-ring.
____________________________________
I have had no problems with new stock Mazda oil o-rings, from street port motors all the way up to my 370 hp Peripheral port road racing engine.
1) Chemical compatibility - the chemical we are sealing is so reactive that straight Viton alone will get soft or swell when exposed to the chemical we are sealing.
2) Low sliding friction - if we have a rotating mechanism and we are trying to use the smallest possible power to turn it, then we use the teflon encapsulated elastomer o-rings.
Again, these are the ONLY two times that we use a Teflon encapsulated viton o-ring.
____________________________________
I have had no problems with new stock Mazda oil o-rings, from street port motors all the way up to my 370 hp Peripheral port road racing engine.
#11
Moderator
iTrader: (7)
What would you use for hydrocarbon and engine coolant?
Generally, Silicone does not have great properties resisting hydrocarbons. Viton is considered to be better. But then again if the teflon is doing all the sealing, and the silicone is never exposed to the process materials, silicone may have better resistance to setting.
Friction shouldn't be the issue, as this is a static seal.
Dave
Generally, Silicone does not have great properties resisting hydrocarbons. Viton is considered to be better. But then again if the teflon is doing all the sealing, and the silicone is never exposed to the process materials, silicone may have better resistance to setting.
Friction shouldn't be the issue, as this is a static seal.
Dave
#12
REPU Wanter
iTrader: (1)
Join Date: Sep 2002
Location: Cherry Point / Havelock NC
Posts: 725
Likes: 0
Received 2 Likes
on
2 Posts
No, I don't remember reading anything specific about stock oil control rings not working with synth oil. I have read everything I could about dino oil and synth etc. in rotary engines. As far as I know it is still an unanswered (Mazda) question when it comes to synth oil. I weighted it all out and came to decision based on all I had read as a whole. In my mind there are two possible reasons not to run synth, and I know this has been beat to death. How synth burns in the combustion chamber and the only other thing synth could possible effect - the seals in the engine. I did two things for my rebuild, modified it to inject two stroke oil (I don't premix) and switched to Viton oil control seals. I will lay to rest the effects of these changes after so many miles, provided nothing else fails before it starts to burn oil on start up.
I really only run synth because of the turbo’s anyways no other reason.
#13
Rotary Enthusiast
iTrader: (1)
Join Date: Jul 2004
Location: Rocket City, Alabama
Posts: 1,035
Likes: 0
Received 2 Likes
on
2 Posts
Viton is the best choice for exposure to oil and gasoline.
Another bad thing about teflon encapsulated o-rings: they do not stretch for installation. They are only really good for face seals (Our rotor housings are face seals.) Teflon encapsulated seals are too stiff to be stretched out to go over an oil control ring, and then they won't elastically retract back into the groove. Bad choice of seal material for center of rotor oil control rings.
Another bad thing about teflon encapsulated o-rings: they do not stretch for installation. They are only really good for face seals (Our rotor housings are face seals.) Teflon encapsulated seals are too stiff to be stretched out to go over an oil control ring, and then they won't elastically retract back into the groove. Bad choice of seal material for center of rotor oil control rings.
Thread
Thread Starter
Forum
Replies
Last Post