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Old 06-23-2004, 09:33 AM   #1
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Default Pistons and Oils, a discussion

Usually I use the stock recommended pistons but as I have gone to a different set of shocks on a fairly new vehicle, my settings don't feel right.

Basically what I want to know is how pistons and oils interact when changes to one or the other are made. So far this is what I think happens:

smaller pistons holes but same oil weight means more pack
bigger pistons holes but same oil weight means less pack

Same idea goes for heavier oil vs softer oil, heavier more pack, softer less.

I think that basically you can achieve similar pack when using different size pistons and different weight oils to compensate for the differences. So for bigger pistons, you will want heavier oil to get the same pack as you would with smaller pistons and lighter oil?

Is this right guys and we pretty much change pistons to fine tune the vehicle?

My case right now is that with my previous stock shocks even 40W oil all around ( 4wd buggy ) felt too soft. I went to slightly smaller piston holes and it felt better but still a bit soft.

Which changes affet the pack the most?
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Old 06-23-2004, 11:58 AM   #2
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You're close!

Assume that you have two shocks that have very similar static dampening. One has pistons with large holes and thick oil, the other has small pistons and thin oil.

The shock with the small pistons and the thin oil will have more "pack" than the other shock. "Pack" is a term used to identfy the shock's initial reaction to sudden and sharp compressions.

Pistons have more effect on the "pack" of the shock, while oil mainly concerns the entire stroke of the shock. You will need to use both to fine tune your car's handling.
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