schrader valve shock question

[racecrazy2]

whats the advantage to schrader valve shocks over a twin tube? if the shock is a lets say 94 series your valving is 4 all the time no matter how much pressure is in the shock....right??
What exactly is the nitrogen pressure change doing?? I know they say more pressure for heavy tracks and less for slick, but why??

Does anyone run gas and twin tubes together or is this not recomended?

[F22 RAPTOR]

whats the advantage to schrader valve shocks over a twin tube?

The schrader valve has no direct influence on performance in and of itself. However I think what your asking is, what are the differences between mono-tube and dual-tube. These are general specs, but a quality builder can build either type to suit your needs and budget. Be careful some builders only want to push the topend really expensive stuff, but you can win without refinancing your home.

MONO
Perform well in rough/wet conditions.
Gas pressure is adjustable which has an effect on spring rate.
Dents in shock body can render shock inoperable.
More expensive than Duals.
Usually owner rebuildable, but owning a dyno is recommended.

DUAL
Perform well in dry/slick conditions.
Gas pressure is fixed.
Dents don't affect shock function, within reason.
Less expensive than Mono's.
Most brands usually require service at the factory or a rebuilder.

if the shock is a lets say 94 series your valving is 4 all the time no matter how much pressure is in the shock....right??

Correct, your dampening stays constant, but gas pressure effects spring rate.

What exactly is the nitrogen pressure change doing?? I know they say more pressure for heavy tracks and less for slick, but why??

Spring rate.

Does anyone run gas and twin tubes together or is this not recomended?

Yes, You can. Its a personal preference.

[racecrazy2]

Thank you for the information, very well explained!