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Unread 02-25-2005, 12:48 PM   #1
mud n rox
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mono tube or twin tube

Whats the difference between a mono tube and a twin tube shock?? I know the mono has one tube and the twin has two, but how do they differ in performance? Why would I want one over the other??

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[B][FONT="Comic Sans MS"][I]2001 TJ Sport - With a little lift, some armor, four mud tires, and a few decals.

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Unread 02-25-2005, 01:07 PM   #2
mwiggs2017
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Good question..i was wondering the same..
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Unread 02-25-2005, 02:19 PM   #3
Parts_Breaker
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Twin Tube Gas
This type of shock absorber has two tubes. An outer reservoir tube and inner pressure tube. The piston moves up and down inside the pressure tube and oil is forced through the compression valve or the rebound valve.

As the oil displaces, an inert gas such as nitrogen at relatively low pressure (around 5 atmospheres) is maintained on the oil in the reservoir tube.

The reason why an inert gas at pressure is used, is to reduce the chances of aeration. This type of shock absorber eventually will fade if used hard and simply requires time to cool for full damping to return.



Mono Tube
As the name implies, this type of shock absorber uses only one tube and the piston valving controls both rebound and compression damping. A floating piston separates the nitrogen gas from the oil and the gas is at a high pressure generally above 20 atmospheres.

This type of shock absorber is more prone to stone damage than the twin tube types. Once the tube is hit, the rod piston and/or floating piston will no longer seal properly against the cylinder wall.

With the gas at the bottom of the shock absorber, it's difficult to design one with as much travel as the twin tube designs above. As such it's a popular shock absorber on road cars and as it heats up, the gas pressure increases and exerts more force on the oil. The end result is that the damping rates increase with heat.




More info here...http://www.safari4x4.com.au/80scool/...absorbers.html
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Unread 02-25-2005, 02:22 PM   #4
Jerry Bransford
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The above is true but monotube shocks are generally better shocks and is what I recently swapped to. Rock damage isn't really a common enough issue to worry about since shocks are generally tucked pretty well up and out of the way. So far as them not being suitable for long-travel suspensions, there are some well known suspension lift manufacturers that would disagree with that. For example, Rubicon Express's "Extreme" shocks that are available at extra cost on RE's high-end long-travel kits are monotube designs.
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Unread 02-25-2005, 02:30 PM   #5
mud n rox
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Ok, so which one do I want to have on my jeep?? My wheeling is on trails and hills, and a little mud never hurt.



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Unread 02-25-2005, 02:35 PM   #6
Jerry Bransford
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Quote:
Originally Posted by lug nut
Sounds to me like the twin tube is more suited for 4 wheeling since it is less likely to incure damage.
Once again, that is not true, the operative word being "likely". MANY hardcore rigs are running monotube shocks. In all the years I've been Jeeping, wheeling, and rock crawling, I have never personally seen or read of it happening. I'm not saying it has never happened, just that it must be pretty darned rare.
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