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Old 04-22-2004, 06:09 AM   #1
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Question Teflon vs. Viton valve seals?

There for my 11/32'' valve (Staineless steel) and .530'' valve guide cast iron heads.
It will have a no hotter than a 180 thermo, Mobil 1 oil, wet sump oiling, no valve stem cups, single spring with a spirl damper, .511'' lift, top engine speed of 6500 rpms, forced induction (TT's), direct port fuel injection (some fuel contact with intake valve stem), most likely be run a little rich, it should only pull about 20'' of vaccume and have a low $ engine crank case evacuation pump.
Teflon is said to be for race engines and viton is the better stock replacement.
What do you think I should run???
Viton or Teflon?
I have been to the Viton web site and seen all its specs when used as O rings and pump seals.
Teflon is teflon I use those seals all the time on hyd system seals to gas turbine compressor stage seals, many uses.
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Old 04-22-2004, 11:15 AM   #2
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Teflon is said to be for race engines and viton is the better stock replacement.
What do you think I should run???
Viton or Teflon?
==============================

Seals like Pioneer OS-966 spring loaded viton rubber in steel shell is the best seal to use (.500" guide OD and screw-on threaded OD with Atlas seal pliers)

or Comp Cams viton seals or other brand seals are very much superior to solid White Teflon seals

Seal Ranking (as far as Lasting/Endurance and actual sealing/oil control)
1st = Viton rubber (spring loaded, in steel shell)
2nd= floating Teflon ring in rubber shell
3rd= white solid Teflon seals
4th= Umbrella and Viton rubber umbrella

every ProStock Car or the Old ProStock Truck heads i've seen
have nothing but screwed-on Viton Rubber / spring-loaded valve stem seals ...never seen any of these type heads use solid white teflon seals

http://www.maxracesoftware.com/Guide_Threads.jpg

http://www.maxracesoftware.com/Guide_Threads_3.jpg

the guide OD is machined, and then Thread-Cut for a Screw-On seal with seal pliers ..instead of press or knock on seals

for ProStock w/Triple Springs , Pioneer and Comp offer smaller OD seals, but the OS-966 seal will also work
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Old 04-22-2004, 05:36 PM   #3
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I don't realy want to do screw on just push on.
I have been looking at spring loaded and sleved teflon and viton (same set up just different materal).
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Old 04-22-2004, 05:39 PM   #4
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Down here at the grass roots level of "what works and what doesn't" I have come to rely on the spring-loaded viton rubber seals with the metal shell around the bottom part.

I used to use the Crane teflon (white plastic) seals for a long time. They are good seals, but they are basically junk if you ever have to remove them. And I believe the claim that they don't last quite as long. My motors are usually "weekend fun" motors and they seem to last plenty of weekends, but I doubt they have factory-type longevity. They also exhibit "weird" sealing problems sometimes. You'll sometimes get one that won't seal even though it looks just fine.

The spring-loaded metal-encased Viton seals are the latest and greatest. The factory uses them (Vortec heads) and they are super-easy to deal with for installation/removal. They always seal up. And they don't self-destruct the instant you have to pull them back off the valve stem past the valve lock groove.

I have never used screw-on seals. That kinda stuff is way outta my league.
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Old 04-22-2004, 07:19 PM   #5
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I don't realy want to do screw on just push on.
=====================================


the thread-cut is more secure


but you don't have to thread the guide's OD
or screw-on this seal

you can simply push it on also

either way, the Viton rubber seals offer the best sealing/endurance
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Old 04-22-2004, 07:38 PM   #6
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Its some work but for extream sbc heads I know a few guysthat have changed the guides to the smaller metric dia size stems and running the honda type seals. Two benifits are lighter valves, smaller seals that allow larger size springs to be run..
...never mind I'm rambling again
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Old 04-23-2004, 12:57 PM   #7
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Heres a picture of Viton Rubber spring-loaded seals
on Chrysler Pro Stock Truck P5 Hemi for 358 cid

http://www.maxracesoftware.com/P5_Pr...cid_Hemi_1.jpg



a Comustion Chamber pic showing the "Hemi" is really not a Hemi
but spark plug do go in thru lower part of valve covers
sort of like original 426 Hemi

http://www.maxracesoftware.com/P5_Pr...mi_Chamber.jpg


about the largest Cylinder Head you'll ever see for a 358 size engine ? a very complicated head to machine

http://www.maxracesoftware.com/P5_Pr..._Hemi_Flow.jpg

using Viton Rubber as a Valve Stem Seal is a great choice,
after all, Viton Rubber is used in as needle/seat material in Carbs,
that just sitting in hot corrosive gasoline all day long, and still seals great in that environment for years.
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Last edited by MaxRaceSoftware; 04-23-2004 at 01:06 PM.
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Old 12-22-2004, 11:42 PM   #8
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Re: Teflon vs. Viton valve seals?

Quote:
Originally Posted by MaxRaceSoftware
Heres a picture of Viton Rubber spring-loaded seals
on Chrysler Pro Stock Truck P5 Hemi for 358 cid

http://www.maxracesoftware.com/P5_Pr...cid_Hemi_1.jpg



a Comustion Chamber pic showing the "Hemi" is really not a Hemi
but spark plug do go in thru lower part of valve covers
sort of like original 426 Hemi

http://www.maxracesoftware.com/P5_Pr...mi_Chamber.jpg


about the largest Cylinder Head you'll ever see for a 358 size engine ? a very complicated head to machine

http://www.maxracesoftware.com/P5_Pr..._Hemi_Flow.jpg

using Viton Rubber as a Valve Stem Seal is a great choice,
after all, Viton Rubber is used in as needle/seat material in Carbs,
that just sitting in hot corrosive gasoline all day long, and still seals great in that environment for years.
i agree, my .02 i am using those same valve seals!
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Old 12-23-2004, 11:56 AM   #9
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Re: Teflon vs. Viton valve seals?

Quote:
Originally Posted by Damon
I used to use the Crane teflon (white plastic) seals for a long time....They also exhibit 'weird' sealing problems sometimes. You'll sometimes get one that won't seal even though it looks just fine.
This is not to state I endorse teflon for street use, or that I don't use the viton myself, but teflon, AFAIC, should be installed dry. By that, I am stating no oil on seal or v. stem, when installing. This may account for some varying degrees of success/failure, in regards to oil control with the teflon seal.
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Old 12-23-2004, 12:47 PM   #10
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Re: Teflon vs. Viton valve seals?

I've always been a fan of viton seals. They have a slightly higher cost but are much more durable and have less drag on the valve. Plus they have a smaller OD which means that they can take a bigger spring or a spring with a smaller ID which can help if you are worried about spring weight.

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Old 12-23-2004, 12:47 PM
 
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