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Old 05-20-2005, 04:21 PM   #1
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Default Shock Piston Question

Question regarding shock pistons and oil selection; in this case, for a BK2 buggy.

If I am using a #56 piston and 25wt oil and decide to switch to a #57 piston and 20 wt oil (smaller holes, lighter oil) and their "feel" is about the same, what is the advantage or change in running a smaller hole piston versus a larger hole piston.

Please keep in mind that I would be changing oil and not using the same weight oil for the different piston sizes.

Hopefully this makes sense.

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Old 05-20-2005, 04:33 PM   #2
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The piston will effect the "pack" that the shock will have during compression. the oil will effect the viscolsiy and how intense the "pack" will be during the compression.

Thick(er) oil should be used with bigger pistons.
Thinn(er) oil should be used with smaller pistons.

This will even out the feel. Thick oil and small pistons will have a lot of pack....like 35 wt and a 57 will be very stiff upon landing. Whereas 25 wt and a 55 will be very smooth throughout the travel.

In my BK, I run 27.5 wt w/ 57's in front and 25 wt w/ 56's in back.

This way, the front stays packed and nimble, but the rear is more forgiving in the turns.

Hope this helps!
Chris Woods



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Old 05-21-2005, 09:28 AM   #3
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Give 27.5/56 in front and 35/55 in the rear sometime. That works very nicely.
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Old 05-21-2005, 10:55 AM   #4
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Much appreciated responses from both of you.

The first response is what I was really looking for (I think); an understanding of what the difference is between a small hole with thin oil and a big hole with thick oil. I had heard the term "pack" before, but never really understood it.

As far as trying something, I am going to be running the BK2 for the first time tomorrow. I have been reading the back of the manual and looking over different set-up sheets trying to grasp the differences a change to a given thing can make.

Maybe this belonged in the BK2/MF2 thread?

Thanks guys. Any further information is appreciated.

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