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Old 06-25-2010, 06:30 PM   #1
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Default Why schrader valves on shocks?

I noticed some Bilsteins have schrader valves. Why is it that mine don't, yet are able to be rebuilt (bye bye crimp top). Is it for convenience?
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Old 06-25-2010, 06:47 PM   #2
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the valves are for changing the pressure of the nitrogen gas below the floater piston.
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Old 06-25-2010, 07:33 PM   #3
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Yup. I don't know if any of them actually came with these valves from the factory. All the ones I've seen have been added during a rebuild by someone like FatCat Motorsports.
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Old 06-25-2010, 07:35 PM   #4
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So what's the purpose for doing this? Ease to revalve or changing the characteristics of the shock on the fly or...?
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Old 06-25-2010, 07:46 PM   #5
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When Bilstein assembles a shock, they have a magical machine that allows them to teleport the nitrogen gas into the bottom of a shock through the steel casing. Folks like Shaikh can't afford this technology, so they drill a hole in the bottom and fit a valve into it.

It's purely an affordance to allow the shock to be re-gassed after a rebuild. I've heard of folks adjusting the gas pressure as a tuning mechanism, but for me, that's a bit like adjusting the front/rear weight distribution by changing the amount of brake fluid sitting in the cup. (It's a far finer level of detail than I'll ever need.)

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Old 06-25-2010, 09:11 PM   #6
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So Bernie from Stewart Dev has this contraption since he doesn't place schrader valves?
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Old 06-25-2010, 11:49 PM   #7
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Or maybe he doesn't use nitrogen

or maybe he has a nitronge-filled glove box

or maybe he backpurges them with nitrogen and holds them upside down to reassemble them

my advance-designs had the shrader valve. I busted one off once because it was too close to the mounting portion and ran into the lower suspension arm.
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Old 06-27-2010, 01:18 PM   #8
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Quote:
Originally Posted by kenzo42 View Post
So Bernie from Stewart Dev has this contraption since he doesn't place schrader valves?
My understanding is that he does have a way of nitrogen pressurizing his shocks, and that it's the device Bilstein uses.
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Old 07-19-2010, 07:41 PM   #9
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Yes, I do have the equipment to pressurize the shocks without the use of a schrader valve.

I can do the shocks either way, but I prefer not having schrader valves. This way the shock won't leak down over time.
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